PIPED CHAINSAW TEST! Expansion chamber for stock chainsaws!
ฝัง
- เผยแพร่เมื่อ 6 ก.พ. 2025
- Dyno testing a pair of expansion chambers.
See if a pipe can help an industrial 2 stroke engine make even more power.
These pipes were custom made to work with stock port times.
Very interesting results from these 100% stock chainsaws.
for more pipe price/info
contact Jeremy at snowxparts@gmail.com
also visit is TH-cam page for more pipe/project updates
/ @rockymountainchainsaw
for porting/dyno info visit my website
worksaws.com/
Real numbers real comparison, no bull, loving it.
Crazy Insane impressive CPI pipe on that 660. A 52% power increase by simply bolting it on and adjusting the carb. I want one! Thanks for the good video!
Cool video buddy! Thanks man.
Few years back I did a quick port map on a 40cc mini tiller. Used online pipe design program. Made up pipe from it and man what a change it made! Sounds like a madd assed dirtbike and tills like never intended! Still use it every spring. Keep On!
That is awesome!
What's the design program name
I think it would be awesome to see a popular saw like a 372 stock or ported and test a stock muffler vs mild muffler mod vs large muffler mod. Great videos keep up the good work! 🤟
I put some CPI triple pipes on a 700 viper sled 10-12 years ago. They claimed 30hp gain. At the same time I long tracked it, 144 to 162. I never changed the gearing but did have to load the primary clutch, even with the extra load from the longer track. Peak power was made at 8400 stock. Peak power with the pipes was at 9100. She sung the sweetest song I've ever herd and held it's own against every 800 I lined up with.
CPI pipes are the real deal.
Those red headed Yami's have an incredible sound! And I love all brands!..from Wyoming USA 🇺🇸 👋🤠
Good video Joe
Thank you
Joe, that was the quietest expansion pipe muffler I've ever heard on a power saw.. Keep em comin
I was surprised how quiet it was too! I was expecting crazy loud inside the shop.
I love the looks of the pipe on those saws.
That is very impressive to see HP gain from a stock saw with just bolting on CPI pipes.
The guy that designs and builds these pipes really knows what he’s doing great video loved it.
I would like to see a pipe for the 3120. This motor is also the radne 120, very popular for go karting and also ultralight aircraft. If you get the porting and pipes dialed in know there would be a HUGE demand from the aviation market.
Thanks!
That's some real voodoo 52%. Absolutely amazing for a bolt on. Nice work Joe
I just tested it. Mike at cpi built the pipe.
I can't belive the gain on the 660, that's crazy!
😳. Finally some real data for these saws. I love what you’re doing with the saw community. Great stuff.
Thank you. I hope it can help other people decide what modifications they want to try.
wow thats some 880 power! Insane numbers impressed
Another great video. In the pipe world cpi is the name. Nice to see the difference in power by just adding a pipe. Now to see what the gains would be with a port job. 😎👍
Ms661c and Dolmar 7910
Love what you are doing I would definitely buy one
Ah we gonna need to see a piped wildthang asap.
Mean green putting up the numbers😂
@@artdombroskie7573 You damn right!
ASAP!
Lol... maybe
Get the heck out of here 😎
This is a cool channel . I was hoping someone would have chainsaw dyno videos rolling out and here we go .
Dyno, this is very valuable technical data!!! This sounds like more fun Brandon!!!
Great video 📹 👍 👏 👌 🙌 this isn't a complaint, just a observation! You are either very nervous 😓 in front of the camera, understandable! Have a very dry personality, and sense of humor!! Or a combination of both 🤔! I appreciate your work!...from Wyoming USA 🇺🇸 👋🤠
Very nice test..looks like these guys got the design correct.
That 660 was dialed in very close
Pipe for the 660 for sure!! I would like to see one that is kept tight to the saw so it can be used to log and cut whenever and wherever needed.
I would have liked to see the weight difference (stock vs. with pipe). Can you comment on that? Love your videos. I subscribed. I like your style/format. All facts and no BS. I wish more youtubers were like this.
Sorry I didn't weigh the pipes. I would guess them at less than 4 lb these are proto type pipes and are thicker than production.
This is just an awesome time to be playing with saw’s!!! That’s for dang sure!!!
Hey Joe, your vids are spot on, most informative and technical chainsaw guru I have seen, keep the vids coming!.
Thank you, appreciate the compliments.
Fascinating!😎... 2 strokes are amazing but it is a rabbit hole! Always impressed how everything comes in to play on those saws muffler airfilter fuel all adds up!
Indeed. 2 strokes are the most fascinating pain in the butt things I have messed with.
That is unbelievable!!
How in the world does that work!!
Good stuff!
There are 100 explanations to that, often quite difficult to understand. But here is one clip with a simple explanation: www.youtube.com/
@@MrJonTe99
I studied it online in an in depth article but it honestly made my head hurt. If I remember the actual sound waves as well as exhaust gas escaping at the exact right distance from the port acted like a vacuum to evacuate the cylinder to allow a better charge for the incoming gases I could be all wet to! I know it works and it’s hard to comprehend!!
Sorry @andy, I was postning the wrong link. It was ment to be this one: th-cam.com/video/Qa5d8XQHlUc/w-d-xo.html
I think the "Water bottle explanation" is a good one to simplify the process.
Great video once again man! I've ran a set of CPI pipes on my 89 Banshee. It opened the flow like a kid stepping on a bee's nest. This channel is growing like a wild fire.
Let's go Blackhawks
I would really like to see a 461 up on the dyno in all forms including stock, modified and piped.
I do have a 461 build coming up soon
@@dynojoemods2764 That's great, can't wait to see. 461 is my personal favorite.
@@dynojoemods2764 yes a 461 for sure.
Nice lookin' pipes. WOW on the gains! Looking forward to the ported runs!
They are very nice pipes! I was shocked to see that much more from them
You have great things going on, Mr. J. I think if Jeremy wanted to tackle pipes for the 3-series Huskies, they'd be winners.
Thank you. I do believe they hope to make pipes for a few models.
Another awesome video.....I will be interested in a 372 pipe for sure. Keep the content coming and this will be one of the top saw channels very soon. All the best and God bless
I would love to see a piped Echo 7310 , with a nice gain it would be on my must have list .
Wow !! Your channel is incredible. Love the content, can’t wait to see a 372xp piped. Keep the videos flowing 👍
Thank you.
I'll try and the the 372 up asap
Nice job DJ that was very interesting to see those results, a big bore ported 372 would be very interesting. Keep up the great vids 👍👍
Good stuff, really well made pipes! Very clean and professional and crazy quiet. Brad had a pipe made for his 390xp back in the day, it had a belly that was telescopic. With the belly like that you could move it in and out to get the correct size for best power, than welded it up when he found the best size. I thought that was a neat idea for pipe tuning, saved a lot of time.✌️
So much goes into pipe building. A lot of it is just educated guesses to get you in the ball park. That sliding belly idea is a pretty slick method.
@Dyno Joe Mods Exactly!
Actually Joe there is computer software available to simulate the pipe dimensions / length ... is it dead nuts on ? No but probably + or - 5% ... leave the stinger long and every inch you cut will raise the powerband 500rpm - strange but true!
@@fabzacres-blackcat
Yes, software, books, calculations, theroy. Lots of things go into pipe building. They all can get you close.
@@dynojoemods2764 A guy who has his port timing AND air flow for the desired rpm (in this case let’s say 8-11 thousand rpm) dialed in dead nuts is gonna shine! Ya take 2 saws / road running between em (everything else is the same , chain , operated skill , wood density type etc) - the dead-nuts dialed in saw is gonna be victorious........ every .... stinking .... time ! My hotwoods ported 660 with tuned intake and JS Bertrand pipe dynoed at 12.9 hp and I ain’t even close to being maxed out ... Had guys calling bullshit but you just proved a STOCKER will pull over 10 hp so all you naysayers can put that in your pipe and smoke it 😉
Really enjoy your dyno vids and other info . Hope they make a pipe for the 7310 or 620
I'd love to see what pipe you could make work on a stihl ms201tc-m. It'd be really great if it could be packaged so that the same was still usable as a climbing saw
That's awesome!!! I would be interested in seeing what gain could be achieved on a 550 mark2. I was impressed with the results of the stock 550 you did. Looking forward to Future videos.
Very impressive love to see one for 572xp
Very impressive. Would love to get ahold of one for my Dolmar PS-7900
That would be a nice optionm
@@dynojoemods2764 hmmm, I just thought about the tuned pipes. They’ll only be making these for stock saws right? Ported saw matching would be a nightmare I’d imagine.
Would love to see a stihl 461 great video
Woods ported 395xp
Love your videos man they’re very informative and the attention to detail is astonishing. Keep it up
Thank you
Very impressive run!!!
WOW! I expected some gain, but 51% is like a dream.
I was shocked to see that as well
Like seeing a chainsaw rockin an expansion chamber.
Would LOVE to have a reliable ported race/woods (higher end ported yet reliable) 592xp *with* the CPI pipe built for the port work. I want it for the fun of buckin big wood (and why not?) hoping to set up something for that to happen (got new 592) just gotta wait to see how its all gotta happen..
👍Good video
Gotta be the classic workhorse 288xp 👍
now i got the idea of building one for my weed wacker 😂
I found an app for 2stroke pipes, have the templates made, just bought the slip rolls, will be finnishing my expantion pipes soon.
It's been a year, any updates?...from Wyoming USA 🇺🇸 👋🤠
592 xp. Want one.
This was awesome! For a comparison I would like to see for comparison the effect that same pipe has on a woods ported 660.
Would absolutely buy one for the fun of it if it proved useful to my ported saws(like the 500 or 881 you did for me)
I need to get the 660 ported sometime.
They will all be model specific. Hopefully they do 881 and 500i pipes those would be fun!
Awesome video man! Can't wait to see the 372 w/pipe. Do you feel like carb size is hurting power now with the pipe?
Thank you.
I'm sure a larger carb would help.
Awesome video and info !
🤝🤝🤝
Thank you
Great video friend.
Thats impressive!! Nice work!
Joe your a chainsaw super hero.
395xp and 3120xp pipe
Would love to see a stihl 08s with tuned exhaust
That was an ace video.
I would love to see an MS 361
I second this.
I’d like to see the MS261C-M or the MS362C-M get some port work & a sweet pipe singing!
I have a ms400 build coming, but no pipe.
Everyone talks up the 372xp but the 572xp is a stronger saw. I run them both daily and always look to the 572. Run some tests on it piped. Or even run them neck to neck. With the exhaust opened up on both the 572xp will win.
372 vs 572 is for sure on the list.
I would like to get one for a husky 395 xp, or 372, or a stihl 660 any of those would be cool.
The 660 was very impressive.
I was shocked to see that type of gain
I'd love to see a ported big bore 372xp with a pipe on your dyno!
Also pleasantly surprised.
Hey Joe, Nice work with the tuned pipe. Have you ever tested the difference between normal mufflers, like ones modded with round 1/2 pipes or just holes with deflectors like either single or dual port style.. is there much difference on the dyno you've noticed?
Not tested many different muffler combinations like that
@@dynojoemods2764 a muffler mod vs tuned pipe episode!
what would be the pros or cons of using a pipe on a 660 that is used for milling?
i have a old 044 would be nice to tune it up 🙂
I’d love to send you my cs-680 absolutely love that saw probably even better with a little grinding on it
The 680 really wakes up with porting
@@dynojoemods2764 love the channel it’s awesome to actually see numbers! After the holidays I’ll definitely be in touch for a some work on the 680.
People love seeing saws cutting wood.... might be cool to see a stock saw timed cut vs a piped saw timed cut. That huge hp increase must translate to some seriously faster cuts
Man, that with a sharp chain would sure make the firewood cutting faster. That is a huge jump in horsepower.
Probably run really well.
would buy one for my 372 or 394 if they were released
He never disappoints ! Does he?! Great work as always brother!
Thank you
Could you do a test with/without max flow airfilter and with/without a WSC bark box? I'm sceptical that they increase the power that much on a stock saw, but I still love those products and am curious
The pair is worth 6-9% Or so on some models.
Cleaner air in and more heat out are worth more than the power increase.
I love your channel!
Thank you.
I think it would be awsome to see one for a 372
I wanna see what it does on a ported saw
50%?!? I've got a LOT to ponder, thanks for this video! WHY do you think it was so dramatic? My understanding is that a performance bike/boat/etc is gonna get like ~20-35% of its power from the pipe (which'd be a 50% over its baseline power IE 2 units would become nearly 3 units of power w/ a pipe, the pipe being about 1/3rd of the total power-output) That's my understanding from Jennings&Blair's books BUT that's on fully tuned setups (w/ durations WAY larger than we run *because* they're taking the pipe into account, which a 660 certainly does not!) Very surprised to see the regular, over100deg exhaust 660 get "regular" results from that pipe, would've thought that impossible..
Re models...I'm very happy hearing insight Re CPI, could not tell if they were legit or not so am happy learning they are & also that the 660 is their primary (as, IMO, it should be for most things, it's just such a great platform but hey I'm a newb) however I am very surprised hearing it's configured for stock-660 layouts, my understanding was the pipe takes into account the porting of the exhaust, no? If so, the pipe would need to be tuned in-accordance w/ that exhaust (IE you'd get your 660 cpi pipe, and its instructions instruct you to crack exhaust at 99.5deg ATDC), I mean I thought the pipe's layout was a function of displacement AND rpm (the latter of which is certainly affected by porting) and, since you're showing gains of 20%+ by porting, it'd be a bad trade-off by going un-ported so you could use a pipe, heck if you can go to 25% boost w/o pipe and 50% w/ pipe I think the lack of a huge pipe makes the worksaw 25% the winner there, obviously that's apples to oranges but hopefully my point is taken as it was meant!
Oh and Re models, the 660 is obvious for a #1 (IMO), doing any 440/462 afterward would be silly when there's other brands so, while I'm certainly biased, I'd throw my vote for the cs-590!! Thing is a beast and, as you've shown, has WAY more un-tapped potential than people realize, so if 1 other saw had its #'s done for a proper pipe I'd say a 590 (though isn't this the kinda thing that's only relevant to hot-saw guys? Not at all trying to make any "groups comparisons" or anything but just see it as such an entirely different piece of equipment I mean sure they've both got bars&chains but if a pipe, methanol, VERY short run-times, etc, it is just an entirely different game I see so little overlap, a hot-saw is WAY closer to a dirtbike than a worksaw, no?)
I would guess the gains are so good on these because the muffler is holding them back and the pipe is dialed in just right to the stock ports. They did that for it to be a bolt on. Not having to port a saw for the pipe to work.
Hey there “Dyno Joe”… Kevin had a cylinder with a dimpled intake and the question came up when dimples in various intake’s cause a power gain? Might be interesting in your 50cc fleet to dimple their intake’s and see if it’s a fact or if that dimpling is fictional???
Worth looking into
Like to see stock vs double port triple port exhaust
Would like to see how the 372 pipe works on a 365 for running in classes.
I might be able to arrange that. May be I can come across a ported 365 for testing too.
@@dynojoemods2764 Cool beans, if it works can you get me a pipe then?
@@StumpShot
If it works, they plan on making dies and being able to stamp out multiple pipes to sell. Should be plenty of supply on pipes.
Man Joe if someone could come up with a tuned muffler that simulated the expansion chamber but not be so ginormous it would be great!!
Also if that had gains that great on a stock saw, wha.t would you have on a ported saw?!!
That would be Nice!
But it takes all that size to get a pipe to function correctly. A pipe could almost be used on a dedicated milling saw? That could be fun.
@@dynojoemods2764
Yes or a saw that you only bucking large logs into rounds.
You know we might be onto something there.
Wish you’d get a 460R in and give it a mild port for a everyday work saw. My new 460 won’t cut any better than my 25-30 year old 55. That old 55 thinks he’s a 462. He’s not but just a rock solid little wood maker. Love that saw! Just a perfect size.
Good onfo Joe
Thank you
Can you get One for a ms661 mag? Price for pipe... Would like to see it run.
I'm not sure what all models they are working on. They hope to keep the prices under 300$
@@dynojoemods2764 Cool. Thanks Der Guy. Keep the videos coming.
I’d love a mini pipe for a 562xp mk2.
Would love to have pipes made for 288.
Are the 660 pipes still being built?
Yes they are. Rocky mountain chainsaw is the TH-cam channel name.
I would be interested in what a "bark box" style muffler mod does to a Stihl 462 on the dyno, because it has the solenoid controlled carburetor. Will opening up the muffler produce more power, or just help it run cooler? Also, there is a lot of debate in the chainsaw user world on what exactly a 7 pin sprocket vs an 8 pin sprocket does. Would an 8 pin sprocket rob more power or torque than it would be beneficial in chain speed. And would a muffler mod give the saw enough power to a saw to run an 8 pin sprocket efficiently? (I have done a lot of non-technical tinkering with saws, but never had any data on stuff, just the unofficial feel test. Lol)
They do make more power, most of it is towards the top half of the power band. Not sure if it is enough difference to run an 8pin or not.
@@dynojoemods2764 I have an old 660 i have done some mods too and when spinning 84 DL (or less) an 8 pin seems to cut much faster. I have run the 8 pin with a 114DL (36"bar) full skip chain in 40 inch red oak, and it cut faster than a new stock 500i (but weighs twice as much...not quite lol) Obviously chain grind is crucial when cutting. But I have never seen any numbers on what it actual does.
372 pipe!!! Woods ported!!! 660 pipe??? Where do I get this pipe???
Email Jeremy
Snowxparts@gmail.com
@@dynojoemods2764 right on…thanks much… have you seen the small dimples guy’s are putting on intake’s to try and help keep fuel suspended? Might be a good video to try a couple different models to see on the dyno if it’s truth or fiction… like a little truth or fictional series or different mods… like the different muffler mod’s… does it increase power…yes or no…true or false… those little dimples are completely decorative in my thinking but it would be nice to see that proven on a real dyno???
@@dynojoemods2764 it’s awesome how fast your channel is growing… it’s very neat to get to see your dyno testing results…I love that little spread sheet data review at the end…where you are really seeing the hp and torque info on paper… you’re kicking butt man!!! Keep up the great work!!! 😁👍
500i and 046, 044 would be nice to have pipes for
coulld you dyno stock 661 with stock exhaust and with bark box ? or egan straight shot
Both of those products gain the same 5-7% on the dyno. If the runs were not marked, it would be hard to tell them apart on a stock saw.
Once the saw is ported they behave. A touch different. But still very close to each other.
Stihl 660,440,461,361,360
I'd like to see a pipe for a 372xp (non x torq)
The new design just arrived. Hope to test it soon
@@dynojoemods2764 @Dyno Joe Mods Awesome, is it possible to do a comparison in the future with different octane fuels (pump 87 up to say 120+ vp c16 race fuel) in a stock vs high compression ported saw to see whether or not there's any gains? Also heard different oil mix ratios can affect power, where more oil makes more power, would be interested in seeing if that's true
Wow!! That's a crazy increase. What kind of gains do you see from porting a 660?
They normally gain 25-30%+
I'd like see a pipe for 372 xp and 357 xp
I have makita ea7900. What pipes can i buy for it