Modified! Stihl Ms661!!
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- เผยแพร่เมื่อ 3 ก.ค. 2024
- Here is a Stihl ms 661 project I picked up. Made some baseline pulls, and swapped on a ported cylinder that was repaired on the channel.
Even threw on the ms660 pipe for some extra fun.
for more products and info visit my site
worksaws.com/
Email Jeremy at Snow X for more pipe buying info
snowxparts@gmail.com
Be sure to check out his channel for pipe testing and new pipes.
/ @rockymountainchainsaw
Really cool info and so neat to be able to see the charts after…The saw community benefits greatly from guys like you putting the time in.
got one from Randy - Mastermind Work Saws in TN, best saw ever
Numbers don't lie!!!!! Thanks for videos brother.
Great to see the difference between them. Pipe shape influences power and torque curve, but that ported cylinder sure made a nice flat power curve and gave good power😉👍
Thanks for trying using the same chart colour for torque and hp personally found it much easier to read and compare 👍
Man, I want to pipe my saws as well. 😁
The modified stock muffler with the extra side exit really works well over stock restrictive mufflers on the 661’s.
I just LOVE your dino videos. Very informative!
👍
Thanks for your uploads, I find lots of good info on your channel. I just acquired an MS661. It was sized by running straight gas and looked really bad inside the cylinder. But it cleaned almost perfectly! I can't feel any scratches under my fingertips now. Waiting for a new piston, because it was irreparable. I'm not going to port it, just a gasket delete and a muffler mod. Maybe bevel that lover transfer entrance on the cylinder, it looks so small and has to feed both upper transfers. First time I see that form of transfer ports.
You could balance a coin on that power band from 8k to 11k. That’s what you want in a work saw right there! Thanks Joe good stuff everytime👍🏻
Usable powerband is key.
Thank you for watching.
@@dynojoemods2764 Looked to follow the factory nearly exact, just wider and higher, perfect!.
Good to see you get it running :).
What's up Doug.
@@brettblack7049 whassss happnin Brett?😎
@@IndianaDoug Sitting on the couch enjoying the fruits of my labor, it's 7 outside and 75 inside.
Gotta head to be, have a great weekend when you get to it :).
Thats awsome buddy i cant wait to come vist with you im building a 661 soon just waiting on parts
Spectacular grind work bud, nice smooth and clean 🙌
Fine results! Thank you!
Great info man. Can't deny the dyno. Thanks for sharing your findings!
Nice work as always
Big gains Joe. Good morning from Virginia.
Thank you.
WOW!!! Thats impressive!!!!
Great video and work!
Thank you
Good Projects 🛠🍻
Stock with the pipe was impressive! Shows how restrictive the stock mufflers are.
Would be fun to actually see the gains from a pipe made for the 661. It bolted up, figured I may as well try it out
these videos are great!
Thanks sawrus
Man I'm speechless... 1stly, thanks a million not just for what you do but for sharing it (and doing that in such an outstanding form!) Ok, to brass-tacks here:
- I'm tickled-pink seeing someone who sees OEM muffs like I do, the way you do the muff in the 461 video is my go-to for 660 muffs (IE, making a new exit, on the PTO side, opposite of the largest OEM exit...though I also go and block the other entrance on the upper-side of the front cover), I cannot help suspect/expect that the design is intended to allow the pulse to "bloom"&expand into that largest/widest area at the bottom-front edge of the muff, where it'd then "arch backwards" back to the flange area -- **and** to the OEM main exit! I think it's no mistake that the main exit is right-past the flange, because this would effectively "force" escaping air to rush-by the next exhaust-pulse exiting the flange, creating *some* level of 'pull'..."cylone"/circular-gas-flow in a muff is one of the only ways, IMO, to truly create suck/pull on the flange w/o using a tuned-pipe..would love your thoughts!
- Are you ever gonna do a video on 'best types of canned muff designs'? You mention it in the "noise or power?" vid on lil-pipes, a vid where you mention these lil pipes are reaching nearly 1/3rd what your pipes reach, I didn't realize just how big that was (your pipe-on-OEM-ports was nearly on-par with ported-with-OEM-muff! To be crystal clear, all "OEM muff"s in this context/tests are "modded OEM", correct?)
- I only care about what I can actually build for-work, is it fair for me to think the following: Porting should boost me quite a bit, and then I'm adding about 1/3rd of the expansion-chamber gains by going w/ a proper short-pipe? Ported 56mm 660 squishing 24.25thou, 1.25mm from-freeport, 99.5/81/126, will say I'm surprised hearing your squish #'s being so large (also surprised seeing you make flat squish bands like everyone else, with your 'schtick' I guess I was expecting multi-angled lol like flat for 1mm, then 0.5deg for 1mm etc til 2deg arch into the chamber....squish-velocity is totally improved when you get rid of flat bands, they're better than 6deg OEM bands but tapered a lil is still better!) BTW am curious if you generally like popups / domed pistons? For instance I was gonna do low 30's squish on a pop-up build, but when the pop-up had a defect/flaw (bad pin placement) I simply tightened down to low 24thou's squish to compensate for using a flat-top :P
Thanks for ANY thoughts, SO eager to see you do a "canned comparison video", honestly I bet the ultimate muffler will be....gah I'm gonna bite my tongue & hope I didn't already post it because I suspect I can find a welder and it'll be easy to do, and should beat ALL of those lil pipes (won't beat an expansion chamber but should HANDILY beat those lil pipes by a respectable margin like at least 1/4th the way from lil pipes to real pipes!)
I'm 2 months' of reading & tinkering from my prior / 1st comment on this video but, damn, I just cannot help re-stating how BIG I think this is (the power-levels you're extracting), I genuinely cannot tell but it SEEMS you aren't just "the best" but are quite a level above the competition-- I BADLY want to be corrected on that, by your or anyone else here, if I'm wrong...but seeing you pull 100%+ power-gains on 60cc cs590's (still can't believe the carb/chassis/etc can handle it!), pulling like 1/4th to 1/3rd+ gains on "regular portwork-only" jobs like the 661 here or sorry it had muffler opened too but wasn't fully blueprinted, spark timed to within 1deg of optima, carb jetted etc it was basically "just" a regular ole port&muff mod, I think it's safe to say most people are NOT getting a ~25-30% boost from their portwork!!!
I hope you do not mind the comments I leave but wanna be clear that if you see them as clutter please please know that I'd *want* you to delete them, I'm a newb in this niche BUT I have put a LOT of study and experimentation into building (660 platform primarily but it's all VERY translatable IMO) and I was very saddened by the MASSIVE disparity between our 2-strokes (OPE/non-piped) and the "real 2-stroke performance world", bothered the hell outta me-- your work & work of those like you is closing that gap, I know the lack-of a pipe (which is REQUISITE for a WORKsaw, gah I wish nobody ever had the idea to put a pipe on a chainsaw, IMO it just "muddies up" things) lack of pipe means we can't extract the same power-per-CC from a unit but just how much weaker must they be? We all know it's not JUST lack of pipe, but a different set of EPA criteria, so - seeing the work you do & those like you do - lets us lay builders understand 'the limits' a bit better, so to speak! Just knowing a cs590, frank'd to an 8HP+ output, knowing that could actually go in-field, for days/weeks/MONTHS without blowing-out the bottom-end, that is VERY comforting-- makes me wish I had the time&$ to buy & build more, so I could push more bounds -- thankfully there's TH-cam with folk like you, so I can at least get a view / insight into the state of the art of OPE-2-Strokes (by "OPE" i simply mean 'real' outdoor.power.equipment, IE "non-piped / box or can style silencer as exhaust system")
Will be making a video on exhausts and tagging you in the title, in hopes you'll consider a couple of the ideas presented (non-restrictive baffle-plates "sandwiched" in 440/660/880 mufflers to "break up" the exhaust pulse's initial "contact w/ exhaust", and other inner-muffler modifications to lessen the return-acoustics' "plugging" effects), as we obviously cannot control - and therefore don't want - these quick & intense acoustic waves in our non-piped OPE-2S's, but if you've got an exhaust-port you've got acoustics, lol, so we gotta work in those confines-- but my muffler-can design, when combined w/ appropriate Grunt Gasket - should effectively ELIMINATE any return-acoustic issues w/o having any measurable impact of the flow or throughput of the exhaust system itself, I sincerely hope you'll watch it and, if you think there's merit, I'm happy to ship any of the baffle plates or grunt gaskets to you (not that I think you'd want that), am guessing you can just spin-up whatever you can envision in your shop-- which is why I'm SO badly hoping you see & "run with" my idea for a REAL lead-in-pipe(grunt gasket), you already know we can like ~1" headers/lead-in's and then any longer our muffler would be hanging-off the front of the crankcase, BUT - if one could fabricate it, just basic welding no biggie to you - but one could simply make a 3" lead-in, wherein 2" of the 3" pipe reside INSIDE the muffler-can, wouldn't really matter because the header ends and has over 1" to dump-into the front-plate, where the pulse would 'bloom & roll' to the rear of the muffler...video will illustrate it better, I'll of course send a URL once it's up!
Hopefully see the Dyno of the 55-56cc class and the 59-60cc class, some of the newer models and the older models!
That is all in the works.
That are some serious numbers!... 9.5 hp is impressive!... thinking of getting a new 90cc to replace my 660 but this time leaning towards the new 592xp seems to be pretty wild out of the box so with porting 🤔🤔😂
Tough choice for sure. Ported 661 are some nice runners.
It seems like the ported 661's and 395's keep beating out the 592's that have been ported.. really wanna see 10+hp 592
592s have a few built in limiting factors for a work type build. But they are very stout out of the box.
Man that pipe blows my mind ... wonder how a progressive mods on stock style muffler can reach peak power ... what works and doesnt... curious to see that on a ported saw.... single double and triple port or that vs bark box style
It’s rumor that removing the baffle on the mtronic style muffler actually reduces horsepower ..... curious to see what that difference would be
I have an exhaust test planned. Still waiting on some parts.
@@dynojoemods2764 I have a 462 bark box here if needed, I can drop it anytime if you'd like.
Thanx! What about only removing spark screens on regular homeowner saws? I think most youtube saw junkies like me digg your stuff, but only have a Rancher or so to cut firewood. Will that help power? Interesting to see results on stuff like that to.
I will have to try some step by step mods sometime.
@@dynojoemods2764 I have a 455 rancher here too 😜
The ported numbers are great. Ported was not far off of the pipe on the stock cylinder. It's amazing how much better the pipe worked on the 660 which I now it was designed for it. With a less restrictive air filter do you think the 661 would break 10hp? Also you thought about adding the dyno charts to your website? It would drive traffic from TH-cam to your website and vice versa. You might even be able to charge a couple bucks a month for a subscription to the dyno charts?
I think the 661 ilkes the higher flow filters. This was a rather tame cylinder. I think ported and better filter 10hp can happen.
I do have a lot of the runs on Facebook. I could possibly add them to the website
I have been trying to find a dyno test of aspen vs pump fuel, but I am having no luck. Have you ever run a comparison?
No fuel tests yet
Awesome video. Out of curiosity would advancing timing bring much of a gain ? And which mods would gain the best from a timing advance? 🤔
Would be something to try out sometime.
In the couple of "tests" I have done it dosent really seem to Change overall power Much. But it does provide a more agressive feel/snap. I will have to try a more scientific approach sometime
Where can I get a modified muffler for my new Ms 391 ?
I sell the deflectors on my website to do it yourself.
Trim them up to fit your muffler, add an extra hole and attach the deflector.
Would you tune my saw?
Yes, depending on the model, could get your saw ported. Check out the website for more info
Www.worksaws.com
Nice work. She sounds like a screamer 😏