Thanks for the wisdom. I believe knowledge is to be passed on instead of trying to keep it to yourself. If we don't pass it along, it will be lost and that is a crime. I've been an engineer for 35 years and your comments ring true. You do fantastic work!
thank you. i finally understand why my old F-150 intake manifold has a huge volume underneath down in the valley, but the same ford v8 modular installed in a crown vic has a much lower volume intake.
Man I love to hear what you have to say this is pure gold,better than any school or collage that folks pay thousands for everything u say on hear I am remembering for the rest of my life this was a very informative video for me somthing tjst I've never thought about or had known about the case volume and theory thanks Harvey love yall
550 for example is a limbing saw and you really want the snappiest throttle response you can get. The husky 5 series have the transfers outside of the bore into the case which make big case volume. So you want those stuffers in there to get a normal case volume. A limbing saw with bogg in the response is nothing to have. A big cc saw for bucking big trees are a different story.
Good show Harvey Crank stuffing vs. volume, and the equation of volumetric ephiceny based on piston volume, lower displacement pluse. Now just add a tuned pipe to increase the pulse, and we can test those head bolts. Hope your wife has a full and speedy recovery. God's Speed to you both.
You help make the day. I caplunk myself 60-1/2 year old but into the soft chair and there you are 4.30 pm. Me and the 47 year old retired Navy seal are topping a stone wall for the Stihl dealer in Manchester NH. When the other is ill is when we shine. Barb is in good hands having a Medic in the house. Grate stuff
I just finished building my first Farmertec 372 and am satisfied with the build. I did put a Nikasil cylinder and upgraded piston on it and replaced the pto side seal in it but that’s it. It runs great. A lot of it was new to me after building so many Stihl saws. The chain break is not intuitive in its assembly but it is working fine, now, even though it is a little stiff. The one thing I like is it does not beat me to death cranking it, like my MS 460.
Hi ironhorse good to hear this wisdom that you are passing on to us.. my son has a husqavana Cr 125. It's due a new piston. Am looking at a wonsser piston. Or one of them vortex ones.. and was going to port it. But don't want to incase a mess it up...
I couldnt agree more on relearning things from past days, I've seen it over and over, problem is someone that wants a feather for their cap forces us into the wasted movement, they just cant take us old farts word for it!
Good day Harvey! Yeah, the past is forgotten pretty quickly. Hyundai came out with a variable lift and duration cam linkage, recently. The holy grail of power! I looked at it closely and guess what I saw? I saw the variable stroke geometry of a old shaper. You know, the old shaper machinist tool. Hyundai adapted the linkage to the valve train! Take a look at it some time. And research the metal shapers of a century OR MORE AGO! Yeah, I was one of the first who recognized the relationship. Big fooey for me. 2 + 2. Basic observational gargle. Hope all is well. You look really healthy. Get on out there and plant ...spring and Mother's day is on the way... another thing I recently learned: Mother's Day is the TIME TO PLANT! I'm a Pasadena city boy who doesn't know jack about farming...but I'd love to learn. We're the same age plus or minus 3. Have a good day
You are completely right ask every professional motocross rider or the people who do the reviews on the new bikes the best handling bikes for 4 stroke bikes would be the early 2000s they call them the double Os how do we get there we take perfect and modify it so much it’s crap again then we slowly go back to perfect which we already had
I agree that more case volume facilitates the potential for more air movement through the saw. Only comes into play with modified saws. As stated many times engines are just air pumps. The more air you can pump through the engine the more fuel you can add to achieve a bigger boom! As long as the supporting parts can handle the bigger boom the more efficient and power the motor will be. Air volume is always the biggest limiting factor in building power in an internal combustion engine
Interesting stuff Harvey. I remember back in the mid to late 90’s Polaris ran what got dubbed the “can” crank on their 440 race sleds. Basically had a stamped steel can on the outside of the crank wheels to fill them in. Those engines ran awesome and those cranks were highly sought after. Like you say, maybe in a few more years some young engineer will re-invent the crank wheel and they’ll do it again! Ha
That was an excellent video. I’m totally pick’n up what you’re put’n down on that. I try learn like you do,take bits and pieces of tricks from other places like hot rods mx bikes,snowmobiles etc and then make your own formula. Just got into this porting and did my first little build based off a lot of what I learned on your channel.Well after a few 2am nights and all the porting was done I did more reading and figured I messed up and the saw might not run. Went agaist all the rules for porting a small cc saw but did it accidentally. Anyway long story short it rips really good and I have a new addiction lol.
Professor Harvey! I hope Barb is recovering well. Thanks for all the knowledge you continually share with us Harv. My opinion is that a well build 3 series will out run any 5 series saw. Someway somehow I’m gonna get 10 minutes of run time on one of your saws. Continued prayers for your family and I hope you have a great week!
So, I’m actually a NASCAR Technical Institute graduate. I’ve worked on 4-strokes from childhood. (Lawnmowers at about 6yrs old). I’m just about a year into learning about 2-strokes (since I wanted more power out of my chainsaw). I must say; I completely understand the concept of everything you’re saying. And I’m sure that at 9-11k rpm’s velocity isn’t an issue no matter how big those transfers get 😂👍🏽. Thank you for the shared knowledge. I do appreciate it. Also, do you know of anyone who’s tuned these types of ports with a flow bench?
Some great inventions came out of the 1900's, two of my freinds are mechanical engineers, i get to here all about it, genuises and backyard wonders have always existed, ive met a few they absolutely amaze me. Barb God bless you, get well
I had a husky 545, it had awful response. Couldn't get it right the dealer changed carb module and coil. Always thought it was the wrong cyl or something from a different model with mixmatched parts. I should've just got the 550xp, that 545 fell out of the chip truck didn't break my heart too much but could've cut alot more wood!
Hello Harvey, getting ready to tear into my poulan pro, having an issue after 3 years of running it, it died out while in the wood, and wouldn’t restart, I had been running the 50:1 true fuel mix in it, when it died, thinking fuel issues, drained tank and cleared the carb, tune up the saw, (fuel filter, plug, and air filter) tried to restart, it ran for about 3 seconds and shut down, ( put it aside for 2 hrs, cooled off, ) and again the same result. I am thinking of pulling the muffler, and checking the top end, if it needs rebuilding, i will let you know, but what else should i look for or do before I dive in?
@@theironhorse6600 no, i dove into it and found a few things from the main issue, when i pulled apart the recoil starter side I found a random nut stuck to the magnet, and that was only part of the real issue, a vacuum leak! Somehow the “random nut” had vibrated off the right side carb stud, and found its way to the magneto side fly wheel. So i cleaned up the saw from 3 years of use re- assembled and fueled it up, primed it fired it up on the second pull! It is running better then when new, will post video soon
Good stuff. So does the saw run cooler because of the greater fuel/air mix then? Keeping heat down would be a bigger benefit than trigger response on a saw working all day. Also, the CO2 cylinders will be working like accumulators on pressure pumps, neat idea. Cheers Harvey
Hey there Harvey... I was looking at the 357xp cylinder with the one side transfer port nipple that is feed from the cases... I was going to delete that until I convinced myself that I should be adding another one to the other side... I was thinking that I would want a check valve or those two booster ports... so it’s able to maintain it’s back pressure and then started thinking that I’d much rather loose the stuffers for the volume... I haven’t got to that project yet but I’m definitely going to be tapping the second nipple to run the left side port... the volume over the pressure I proved worked as on my 350 cylinders I cut out the material between my upper transfer for the volume over the speed and they run like a much bigger cc engine in the torque department. I’d much rather have a saw with a 12k top speed that can pull chain at 10,500... than a saw that spins 13,500 top rpm’s but then drops to 10k in the cut... personally I don’t like stuffers because I don’t believe in a increase air fuel mixture speed over sure volume... I don’t think the material between the transfer does anything but provide support or stability to the piston ring and restrictions to the fuel charge...??? The water flow with them gone looks a lot better to me?
Great concept with more area for air/fuel. 💪🏻💚Would the tubes or lines from the co2 cylinders have any negative effects. Will they fill faster with inlet to them from the case itself ???? Prayers to barb. Thank you for all of your knowledge. Our future will be better with the sharing of what we know .!!! Love what your doing. 🪓⚡️👊💚
Hey Harv, in dire need of a coil for a Poulan Pro 655, looks like it uses the same as the 405, 455 and probably the Pioneer saws of the same order. Although I haven't checked that far yet! Any help is appreciated, hope all is well.
Everything has already been done.....as I look back......what actually advances is lubricants, metallurgy, rubber/tires and electronics/computers.....what was tried in the past that didn't work well can now be made to work.....usually by adding complexity somewhere....
Excellent video Harvey. I enjoy your videos very much. Crankcase volume is one of my favourite topics on 2 strokes. It would interesting to do a side by side comparison of 2 identical saws. One with crank stuffers and one without. I wonder how much power is lost out the exhaust do to no tuned pipe. Once a saw is cranked right up, how much of that fresh fuel and air mixture is going right out the exhaust? Without a tuned pipe that’s a tough one to deal with
@@lennie8098 uses ultrasonic frequency and an oil solution to break down dirt and corrosion. Kind looks like a little fryer with a basket . lol time to fry me up a carb 😁
Crank stuffer and transfer size is basically the only difference between my 565 and a 572 I think?? Thinking of you and barb. As always WORK SAFE 😎😎🇺🇸🇺🇸
Hello Harv, what about knife edging the counterweight that'll help get more case volume also if you cut the weights down to about half the size and also lighten up the crank some... be glad when Barb gets back on her feet to whoop you into shape again 🤣🤣🤣
@10:57 : Harvey, IMO, with those CO2 cylinders, you're not really going to make more 'case volume,' you're attempting to make 'transfer resonators,' which in a round-about sort of way you could say that they increase 'case volume,' but not really. I think it may help push more charge into the piston cylinder, though. Very interesting concept. Are you installing two cylinders per transfer? And if you get the resonator tube and cylinder size calculated and matched for the rpm's you want to optimize, this idea just might be something. You could even have two different resonators that will resonate at different rpm's, expanding your power-band. I like this idea! But you're pushing for 16,000 rpm?! Ouch! At that rpm, the torque curve has jumped off a cliff long time ago. Will you're proposed reed valves survive or even keep-up at these high frequencies and still be able to breath enough? RC model reed-valved engines do get up there, but they're no-where the displacement as your saw is! The petals will have to be pretty short to be able to stay below their resonating frequencies at your proposed rpm's, and you'll need plenty of petals to keep up with the charge demands. Awesome ideas!
Harv love all of your knowledge and can’t wait for your next video! I have a 390xp that’s acting crazy and i only found one other person that said theirs did the same. Would you be interested in talking with me about it?
You know what? The knowledge in you is fascinating in our current world the internet has made obtaining greater information much easier to obtain, and pass along such as your doing for us.
Bad part a lot new engineers don't want listen too the guy that does the job every day. They want do everything on paper. A lot needs to be looked at machine been alter do more than was designed to do. That or machine pushed to break point get more parts out. Now a days most companies want more than looking at top quality parts.That or you get a good engineer some companies don't want hear or step outside there normal production. Yes it going cost money in beginning but a lot times it will make a better quality part. That or less machining time. I've seen so many good engineer get fired where I work because what they accomplishes. It sad and some those are the one that share what they learned. And give you better understanding how things can run better.
If that's true then why would Donnie Walker make full circle cranks with two piece heads and pop up domed pistons for Husqvarna 3120xp hot saws, or why he loved the 357xp because it comes with a full circle crank from the factory, by having a full circle crank it actually allows more fuel into the top end thru the transfers dues to less volume in the crank case, I think you are just thinking about it in the wrong way, it does make it accelerate faster, but just cus it does accelerate faster off the rip doesn't mean it's not Gunna have top end power, or by putting a full circle crank in place of a counter weight style it will impede top end, it doesn't, the new saws with full circle cranks that don't have the top end like u describe is due to the total engine design, not just because it has a full circle crank.
Personally my opinion on stuffers is a little complicated. The 5xx series husky’s does use stuffers on a lot of them. (562, 572, 576, 550, ect) I don’t think any of those saws are slouches in their weight class and produce power comparable to the older 2-3xx series stuff but with a different powerband. The 357xp and 359 were some examples that showed older saws of similar size utilizing both stuffed and unstuffed cranks. The stuffed 357 was a zippy saw while the 359 was a bit slower but seemed to have more grunt to it. I enjoy watching every one of your videos while I work in my shop and hope to bounce ideas off of you in the future. I’m a lot like you in the fact I love trying different things with my projects. I currently have a 359 crankcase that I’m going to put 357 crank stuffers in and mated with a 272 piston and cylinder. Doing a autotune delete and rebuild on a 562xp. Have a 371 that’s getting a hyway big bore with pop up piston. All kinds of stuff. Keep up the good work and the best to you and barb and the kids
Then why does walker saw shop out of Canada who worked in r&d who built the best husqvarna race saws swear by full circle crank? Its un the fuel air mix, it in the tuning, when it comes to the 357xp why is it a better fater saw than the 359 non exp? Both same saws the 359 no stuffers? Its the design, dint hog out the transfers on full curcle, concentrate on squish and use pop uo pistons to use compresstion and port the exhuast muffler to incrrase flow and focus on the tune, my hyway pop up piston, cylinder moded 357xp hokds its own to any x tork 372xp. Im a production arborist in the feikd coming on 10 years ill tell u stuffers have tgeir place, the 365 special sucks compares to the 357xp and the 357xp blows the 359 out of the water? Why is that?
![ประสบการณ์ จ้าง Developer ที่ผมจะไม่มีวันลืม [ภาค2]](http://i.ytimg.com/vi/pZbsSDRrmXA/mqdefault.jpg)
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Thanks for the wisdom. I believe knowledge is to be passed on instead of trying to keep it to yourself. If we don't pass it along, it will be lost and that is a crime. I've been an engineer for 35 years and your comments ring true. You do fantastic work!
thank you. i finally understand why my old F-150 intake manifold has a huge volume underneath down in the valley, but the same ford v8 modular installed in a crown vic has a much lower volume intake.
Man I love to hear what you have to say this is pure gold,better than any school or collage that folks pay thousands for everything u say on hear I am remembering for the rest of my life this was a very informative video for me somthing tjst I've never thought about or had known about the case volume and theory thanks Harvey love yall
that's why we drilled micro holes in the edge of the top of the piston on pro stock engines in the 70 and 80"s
550 for example is a limbing saw and you really want the snappiest throttle response you can get. The husky 5 series have the transfers outside of the bore into the case which make big case volume. So you want those stuffers in there to get a normal case volume. A limbing saw with bogg in the response is nothing to have. A big cc saw for bucking big trees are a different story.
Good show Harvey
Crank stuffing vs. volume, and the equation of volumetric ephiceny based on piston volume, lower displacement pluse.
Now just add a tuned pipe to increase the pulse, and we can test those head bolts.
Hope your wife has a full and speedy recovery. God's Speed to you both.
That was supposed to be Volumetric efficiency
You made my day. The whole day is good now. Love that nature and logic hard to see anymore.
You help make the day. I caplunk myself 60-1/2 year old but into the soft chair and there you are 4.30 pm. Me and the 47 year old retired Navy seal are topping a stone wall for the Stihl dealer in Manchester NH. When the other is ill is when we shine. Barb is in good hands having a Medic in the house. Grate stuff
Volume Had A Little Buzz But With The Great Knowledge It Was Worth It Brother
Ultrasonic parts cleaner going in the background
We love you Ironhorse.
Barb, God Bless and Protect you and your wonderful family!!!
Bless you Ironhorse for sharing your wisdom with us!!!
I just finished building my first Farmertec 372 and am satisfied with the build. I did put a Nikasil cylinder and upgraded piston on it and replaced the pto side seal in it but that’s it. It runs great. A lot of it was new to me after building so many Stihl saws. The chain break is not intuitive in its assembly but it is working fine, now, even though it is a little stiff. The one thing I like is it does not beat me to death cranking it, like my MS 460.
Educating, carb cleaning and looking after the family your a busy man Harvey. Top man respect to you
Hi ironhorse good to hear this wisdom that you are passing on to us.. my son has a husqavana Cr 125. It's due a new piston. Am looking at a wonsser piston. Or one of them vortex ones.. and was going to port it. But don't want to incase a mess it up...
I couldnt agree more on relearning things from past days, I've seen it over and over, problem is someone that wants a feather for their cap forces us into the wasted movement, they just cant take us old farts word for it!
like they say theres nothing new under the sun. its just our turn .
Awesome how your incorporating dirt bike and possibly snowmobile tech into your saw builds.Very Cool!!
Good day Harvey! Yeah, the past is forgotten pretty quickly. Hyundai came out with a variable lift and duration cam linkage, recently. The holy grail of power! I looked at it closely and guess what I saw? I saw the variable stroke geometry of a old shaper. You know, the old shaper machinist tool. Hyundai adapted the linkage to the valve train! Take a look at it some time. And research the metal shapers of a century OR MORE AGO! Yeah, I was one of the first who recognized the relationship. Big fooey for me. 2 + 2. Basic observational gargle. Hope all is well. You look really healthy. Get on out there and plant ...spring and Mother's day is on the way... another thing I recently learned: Mother's Day is the TIME TO PLANT! I'm a Pasadena city boy who doesn't know jack about farming...but I'd love to learn. We're the same age plus or minus 3. Have a good day
Great information Harv! Thanks! Hope everybody is doing well. Praying for Barb’s daughter!
Nice to see you buddy. We all have opinions makes the world go round..been some real nice weather..almost dry in woods..
You are completely right ask every professional motocross rider or the people who do the reviews on the new bikes the best handling bikes for 4 stroke bikes would be the early 2000s they call them the double Os how do we get there we take perfect and modify it so much it’s crap again then we slowly go back to perfect which we already had
I agree that more case volume facilitates the potential for more air movement through the saw. Only comes into play with modified saws.
As stated many times engines are just air pumps. The more air you can pump through the engine the more fuel you can add to achieve a bigger boom! As long as the supporting parts can handle the bigger boom the more efficient and power the motor will be. Air volume is always the biggest limiting factor in building power in an internal combustion engine
Always very informative...Thanks. Hope Barb is feeling better. Take Care, Stay Safe and Be Kind...
Nice video Ironhorse!. Collin just came in on the end!. I love to watch you run the saws!.. Have a great weekend!..
Interesting stuff Harvey. I remember back in the mid to late 90’s Polaris ran what got dubbed the “can” crank on their 440 race sleds. Basically had a stamped steel can on the outside of the crank wheels to fill them in. Those engines ran awesome and those cranks were highly sought after. Like you say, maybe in a few more years some young engineer will re-invent the crank wheel and they’ll do it again! Ha
I remember when Yamaha started using a “boost bottle “ on some of their motocross bikes back in 1982. They worked under the same principle.
That was an excellent video. I’m totally pick’n up what you’re put’n down on that. I try learn like you do,take bits and pieces of tricks from other places like hot rods mx bikes,snowmobiles etc and then make your own formula.
Just got into this porting and did my first little build based off a lot of what I learned on your channel.Well after a few 2am nights and all the porting was done I did more reading and figured I messed up and the saw might not run.
Went agaist all the rules for porting a small cc saw but did it accidentally. Anyway long story short it rips really good and I have a new addiction lol.
Thanks for all of the knowledge for us young squirts.
Professor Harvey! I hope Barb is recovering well. Thanks for all the knowledge you continually share with us Harv. My opinion is that a well build 3 series will out run any 5 series saw. Someway somehow I’m gonna get 10 minutes of run time on one of your saws. Continued prayers for your family and I hope you have a great week!
Give Barb our well wishes, and i'm working on that Mcculloch yellow paint!
Get better barb! Love you guys so much
Good points, have you looked at a modern ktm sx 65 cylinder? The power valve is vacuum activated might be fun to put one on a saw.
So, I’m actually a NASCAR Technical Institute graduate. I’ve worked on 4-strokes from childhood. (Lawnmowers at about 6yrs old).
I’m just about a year into learning about 2-strokes (since I wanted more power out of my chainsaw).
I must say; I completely understand the concept of everything you’re saying.
And I’m sure that at 9-11k rpm’s velocity isn’t an issue no matter how big those transfers get 😂👍🏽.
Thank you for the shared knowledge. I do appreciate it. Also, do you know of anyone who’s tuned these types of ports with a flow bench?
Nice video. Volume is everything
Some great inventions came out of the 1900's, two of my freinds are mechanical engineers, i get to here all about it, genuises and backyard wonders have always existed, ive met a few they absolutely amaze me. Barb God bless you, get well
I had a husky 545, it had awful response. Couldn't get it right the dealer changed carb module and coil. Always thought it was the wrong cyl or something from a different model with mixmatched parts. I should've just got the 550xp, that 545 fell out of the chip truck didn't break my heart too much but could've cut alot more wood!
What's the word on cylinder plating. Is there a place to send one? I'd like to bore a 576 cylinder to 52 or 56mm.
Love you Iron Man, I have learned a whole lot from you, we have been praying for you and Barbara hope all is well
I am calling you Iron Man because you are the Iron Man two-stroke genius
In my opinion. The 272 was a great saw. It has nothing to do with the subject. But that's my opinion. And another great video.
Hello Harvey, getting ready to tear into my poulan pro, having an issue after 3 years of running it, it died out while in the wood, and wouldn’t restart, I had been running the 50:1 true fuel mix in it, when it died, thinking fuel issues, drained tank and cleared the carb, tune up the saw, (fuel filter, plug, and air filter) tried to restart, it ran for about 3 seconds and shut down, ( put it aside for 2 hrs, cooled off, ) and again the same result. I am thinking of pulling the muffler, and checking the top end, if it needs rebuilding, i will let you know, but what else should i look for or do before I dive in?
Bad coil?
@@theironhorse6600 no, i dove into it and found a few things from the main issue, when i pulled apart the recoil starter side I found a random nut stuck to the magnet, and that was only part of the real issue, a vacuum leak! Somehow the “random nut” had vibrated off the right side carb stud, and found its way to the magneto side fly wheel. So i cleaned up the saw from 3 years of use re- assembled and fueled it up, primed it fired it up on the second pull!
It is running better then when new, will post video soon
Love it!
@@theironhorse6600 video of cleaning and repair is up! Harv, thank you for some of insights through your videos
Hope Barb's is going okay and take care of yourself.
can you open up the case by removing metal
Hi Harv...hope all is well... sound on video not so good today?.... thanks 4 video. be kind
Good stuff. So does the saw run cooler because of the greater fuel/air mix then? Keeping heat down would be a bigger benefit than trigger response on a saw working all day. Also, the CO2 cylinders will be working like accumulators on pressure pumps, neat idea. Cheers Harvey
Hey there Harvey... I was looking at the 357xp cylinder with the one side transfer port nipple that is feed from the cases... I was going to delete that until I convinced myself that I should be adding another one to the other side... I was thinking that I would want a check valve or those two booster ports... so it’s able to maintain it’s back pressure and then started thinking that I’d much rather loose the stuffers for the volume... I haven’t got to that project yet but I’m definitely going to be tapping the second nipple to run the left side port... the volume over the pressure I proved worked as on my 350 cylinders I cut out the material between my upper transfer for the volume over the speed and they run like a much bigger cc engine in the torque department. I’d much rather have a saw with a 12k top speed that can pull chain at 10,500... than a saw that spins 13,500 top rpm’s but then drops to 10k in the cut... personally I don’t like stuffers because I don’t believe in a increase air fuel mixture speed over sure volume... I don’t think the material between the transfer does anything but provide support or stability to the piston ring and restrictions to the fuel charge...??? The water flow with them gone looks a lot better to me?
That's brilliant! Boost bottles on a saw!
Remember when boost bottles were popular on dirt bike intakes? It seemed like all the yz's had them
YEIS- Yamaha Energy Induction System. First seen in 1982 on YZ250 and 490 I think if my memory serves me.
CASE VOLUME?? NEVER HEARD OF IT?? 😉
Solid roller cam, tunnel ram, BBC just need to figure out how to get one attached to a bar and chain.
Great concept with more area for air/fuel. 💪🏻💚Would the tubes or lines from the co2 cylinders have any negative effects. Will they fill faster with inlet to them from the case itself ????
Prayers to barb. Thank you for all of your knowledge. Our future will be better with the sharing of what we know .!!!
Love what your doing. 🪓⚡️👊💚
Great insight... but dam that sonic cleaners noise
Hey Harv, in dire need of a coil for a Poulan Pro 655, looks like it uses the same as the 405, 455 and probably the Pioneer saws of the same order. Although I haven't checked that far yet! Any help is appreciated, hope all is well.
Sounds like you need a more open carbie. You can't get the volume through the venturi fast enough.
Everything has already been done.....as I look back......what actually advances is lubricants, metallurgy, rubber/tires and electronics/computers.....what was tried in the past that didn't work well can now be made to work.....usually by adding complexity somewhere....
Excellent video Harvey. I enjoy your videos very much. Crankcase volume is one of my favourite topics on 2 strokes. It would interesting to do a side by side comparison of 2 identical saws. One with crank stuffers and one without. I wonder how much power is lost out the exhaust do to no tuned pipe. Once a saw is cranked right up, how much of that fresh fuel and air mixture is going right out the exhaust? Without a tuned pipe that’s a tough one to deal with
Have you ever experimented with piston skirt chamfering ?
What happened to the one saw you were building that had that bolt on top end?
You have sound interference from something? Maybe a light ballast? Oh the sonic cleaner buzzing.
Sonic cleaner buzzing. Lol
Cullen what's in the sonic cleaner?
@@lennie8098 uses ultrasonic frequency and an oil solution to break down dirt and corrosion. Kind looks like a little fryer with a basket . lol time to fry me up a carb 😁
@@lennie8098 misread your question. Mac 125 carb.
Just a thought . How about mountain one of them co2s on each side to equal each side of the transfer's ?
Crank stuffer and transfer size is basically the only difference between my 565 and a 572 I think?? Thinking of you and barb. As always WORK SAFE 😎😎🇺🇸🇺🇸
Autigers 2010 I would get a 572. I only bought this 565 because I got a REALLY good deal on it.
love watchin your videos harv!
Hello Harv, what about knife edging the counterweight that'll help get more case volume also if you cut the weights down to about half the size and also lighten up the crank some... be glad when Barb gets back on her feet to whoop you into shape again 🤣🤣🤣
would that not throw the crank balance off ? ( just wondering )
Pretty sure he knife edged the crank in junk yard dog.
@10:57 : Harvey, IMO, with those CO2 cylinders, you're not really going to make more 'case volume,' you're attempting to make 'transfer resonators,' which in a round-about sort of way you could say that they increase 'case volume,' but not really. I think it may help push more charge into the piston cylinder, though.
Very interesting concept. Are you installing two cylinders per transfer? And if you get the resonator tube and cylinder size calculated and matched for the rpm's you want to optimize, this idea just might be something. You could even have two different resonators that will resonate at different rpm's, expanding your power-band.
I like this idea! But you're pushing for 16,000 rpm?! Ouch! At that rpm, the torque curve has jumped off a cliff long time ago. Will you're proposed reed valves survive or even keep-up at these high frequencies and still be able to breath enough? RC model reed-valved engines do get up there, but they're no-where the displacement as your saw is! The petals will have to be pretty short to be able to stay below their resonating frequencies at your proposed rpm's, and you'll need plenty of petals to keep up with the charge demands.
Awesome ideas!
love the vids keep em up Learn so much from ya
Always Remember. NO MATTER WHERE YOU ARE FROM YOU ARE ALWAYS A PART OF THE IRONHORSE CALVARY! Thank you for being you
Harvey we the Klaviter clan hopes that your clan gets well soon. Give our best to your girl friend!!!
Nice video great info
Interesting stuff, Harvey!
Hey Harvey hope everything is going well
Harv love all of your knowledge and can’t wait for your next video! I have a 390xp that’s acting crazy and i only found one other person that said theirs did the same. Would you be interested in talking with me about it?
Hey Ironhorse. Hope you're well buddy.
Boost bottle on the old yamaha 600 sleds
Hopefully your wife will get a lot better 🙏
You know what? The knowledge in you is fascinating in our current world the internet has made obtaining greater information much easier to obtain, and pass along such as your doing for us.
Bad part a lot new engineers don't want listen too the guy that does the job every day. They want do everything on paper. A lot needs to be looked at machine been alter do more than was designed to do. That or machine pushed to break point get more parts out. Now a days most companies want more than looking at top quality parts.That or you get a good engineer some companies don't want hear or step outside there normal production. Yes it going cost money in beginning but a lot times it will make a better quality part. That or less machining time. I've seen so many good engineer get fired where I work because what they accomplishes. It sad and some those are the one that share what they learned. And give you better understanding how things can run better.
Barb the great gal behind the great man a team
If that's true then why would Donnie Walker make full circle cranks with two piece heads and pop up domed pistons for Husqvarna 3120xp hot saws, or why he loved the 357xp because it comes with a full circle crank from the factory, by having a full circle crank it actually allows more fuel into the top end thru the transfers dues to less volume in the crank case, I think you are just thinking about it in the wrong way, it does make it accelerate faster, but just cus it does accelerate faster off the rip doesn't mean it's not Gunna have top end power, or by putting a full circle crank in place of a counter weight style it will impede top end, it doesn't, the new saws with full circle cranks that don't have the top end like u describe is due to the total engine design, not just because it has a full circle crank.
I’m trying to listen but the ultrasonic is making me nuts
Why don’t you, Buckin’ and Tinman mention Bellhopper anymore?
Personally my opinion on stuffers is a little complicated. The 5xx series husky’s does use stuffers on a lot of them. (562, 572, 576, 550, ect)
I don’t think any of those saws are slouches in their weight class and produce power comparable to the older 2-3xx series stuff but with a different powerband. The 357xp and 359 were some examples that showed older saws of similar size utilizing both stuffed and unstuffed cranks. The stuffed 357 was a zippy saw while the 359 was a bit slower but seemed to have more grunt to it. I enjoy watching every one of your videos while I work in my shop and hope to bounce ideas off of you in the future. I’m a lot like you in the fact I love trying different things with my projects. I currently have a 359 crankcase that I’m going to put 357 crank stuffers in and mated with a 272 piston and cylinder. Doing a autotune delete and rebuild on a 562xp. Have a 371 that’s getting a hyway big bore with pop up piston. All kinds of stuff. Keep up the good work and the best to you and barb and the kids
Hey 😊👍👍🌞🌎
I bet them clamshells are the best
What's up
👋
why do boat motors scare you ,Ithink they are the ultimate in in 2 stroke power and fun to build.
Just add a Roast battle
Then why does walker saw shop out of Canada who worked in r&d who built the best husqvarna race saws swear by full circle crank? Its un the fuel air mix, it in the tuning, when it comes to the 357xp why is it a better fater saw than the 359 non exp? Both same saws the 359 no stuffers? Its the design, dint hog out the transfers on full curcle, concentrate on squish and use pop uo pistons to use compresstion and port the exhuast muffler to incrrase flow and focus on the tune, my hyway pop up piston, cylinder moded 357xp hokds its own to any x tork 372xp. Im a production arborist in the feikd coming on 10 years ill tell u stuffers have tgeir place, the 365 special sucks compares to the 357xp and the 357xp blows the 359 out of the water? Why is that?
Hi
Couldn’t even watch because of that background noise!
Every single high performance 2 stroke has stuffers. They make more power with them.
Boost bottle!
Nice to see you buddy. We all have opinions makes the world go round..been some real nice weather..almost dry in woods..