Hayduke
New member
I’d happily pay whatever your fee is even if exorbitant I can’t find one anywhere on eBay or the rest of the internet machine actually.
Custom exhaust tinkering
- Thread starter jasent
- Start date
Fabz
Active member
I appreciate that , atm I’m very busy making piped exhausts for customers. Now … a velocity stack , flow work and one of these rowdy pipes really make a saw pull hard in the wood ! Here is what I’m talking about …
Fabz
Active member
A recent video of a 562xp thru Wny ash. Saw has rowdy pipe and the cylinder was lightly flowed / blueprinted. A velocity stack and more aggressive flow work will give much greater gains … As you listen to the saw cut notice I do not favor the high rpm like some other builders do - I just take what the factory gives me and make it run more efficiently without all the fanfare of “high compression and machine work”. A solid 18% to 40% gains in cut speed can be obtained depending on model. The 562xp responds nicely to some basic mods however it can be made into a 40% gainer. The issue is that you need 3 things for a saw to be considered an excellent work saw : performance, fuel economy and longevity - it’s easy to get the first one , the second and third are much more difficult especially as you increase the first. A solid 23-27% gain seems to be the “sweet spot” from my experience….
Fabz
Active member
After further refinement I was able to get almost 42% increase in cut speed with the 562xpg - this saw uses a handmade pipe and a ps63 cutting attachment. There is NO , I repeat absolutely NO port work / machining done whatsoever on this saw ! The air filter , jug and slug are all BONE STOCK !!! Hahaha and “They” said it wasn’t possible! Once again ol Fabz has proved the so-called “forum experts” incorrect and there’s Plenty more in that saw! Lmfao 
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After further refinement I was able to get almost 42% increase in cut speed with the 562xpg - this saw uses a handmade pipe and a ps63 cutting attachment. There is NO , I repeat absolutely NO port work / machining done whatsoever on this saw ! The air filter , jug and slug are all BONE STOCK !!! Hahaha and “They” said it wasn’t possible! Once again ol Fabz has proved the so-called “forum experts” incorrect and there’s Plenty more in that saw! Lmfao
How about having your piped saw sent for independant dyno testing against a stock saw on the same dyno- then we might be able to draw factual gain percentages?
A lot of the fancy muffler work was done years ago for 2 stroke motorcycles. There were books written with formulas and guides on how to build a muffler that would boost the hp of your 2 stroke motor. I remember seeing some of these mufflers on those monster chain saws used in competitions. The right muffler not only boosts power but makes the saw more efficient.
2 stroke motorcycle expansion chambers and race saw piped exhausts are leaps and bounds above standard chainsaw exhaust systems, modified standard- or the latest craze of welded pipe/square tube efforts.
My point exactly. So why reinvent the wheel with welded pipe/sq tube exhausts? Why not follow in the footsteps of the guys who have already done it and perhaps expand on their efforts?
Fabz
Active member
I’ve already documented 25% increase in cut speed on this 562xp using the rowdy pipe using the same bar and off the roll c83 chain in 16” wny ash … cut time went from 16 to 12 sec which works out to 25% and I have the videos to show this. As a saw builder, you of all people should know that the 562xp really wakes up with a muffler mod or if for some reason you didn’t now you know … Here , I Pick up almost 17% using an off roll ps63 chain and cannon bar vs an off the roll c83 chain … that means a total of 25% + 17% which equals 42% gains over stock … on a bone stock cylinder! With a Hotwoods port I can get over 60% which easily puts me in the top percentile for this model/version saw …
Fabz
Active member
I have no problem drawing factual gain percentages as I’m the one running the saw! Off the roll c83 and off the roll ps63 chain were used here on these tests - same chain you, I or anyone else can buy right from the dealers shelf. Of course “preparing” the chain properly would increase the cut speed but in order to give fair and repeatable results off the roll is used. I did send a version to Dyno Joe and it was tested but it was on a different saw …. As far as the “dyno” testing you speak of … nice to see but imho really not necessary on a relatively low hp output single cylinder two-stroke anyway … timed cuts in the wood and a good tachometer is going to tell you more than a Dyno ever will - real world results! Simply too much variation (you get more hp with a “cold” engine) and operator bias to try and equate “dyno results” with actual cut times. Thats why I laugh when I see these supposed 70cc saws that are around 6.0hp stock supposedly making 9.5hp on the Dyno and then watch the saw actually cut in the wood - the “9.5hp” sure looks to be about 7.5 to me! I guess hp sells saws … however TORQUE wins races
Fabz
Active member
No doubt ! A properly built expansion chamber is going to take advantage of physics / sonic pulses to allow the engine to effectively increase its displacement. A 125cc dirtbike engine on the pipe is getting “supercharged” via the pipe to the tune of around 180cc - that’s what gives the “hit”. Trying to use one on an everyday worksaw is another kettle of fish though - too bulky and unwieldy for practical use - that’s why I built/designed the rowdy pipe we see here. Fits right in where the muffler went and outperforms ANY can muffler - also makes saw run cooler
Fabz
Active member
Because the expansion chamber style pipes aren’t really practical for anything other than racing , really aren’t going to drop trees with one on a saw
and obviously because the pipes work - there’s a lot of folks running these style pipes and having excellent results with them. 
, Last I looked this thread was called “custom exhaust tinkering?” 
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Fabz
Active member
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Fabz
Active member
Here’s a Hotwoods 261c that I built a few years ago. It’s has the stock can with a pipe so technically it’s a custom exhaust 
. As you can see it moves right along with the ps63 chain and the Hotwoods porting I do (tuned intake, flow ported , tuned exhaust) Ps63 is NOT race chain (as our beloved member @ huskihl refers to it as) rather it is a 3/8 .050 lo profile chain that has been available for years. It cuts quicker than standard 3/8 .050. It can be made into “race chain” but then again so can standard 3/8 .050. I do all my testing in wny hardwood and with off the roll chains (STIHL rs , Husqvarna c83 and STIHL ps63) to keep everything as fair and equal as possible. The use of a specially-prepared “race chain” in cake-soft pine/balsa wood to showcase the supposed “gains” is completely unethical and dishonest and leaves a stain on the saw performance world … There was a fellow , (von snellink iirc) from Ohio who was infamous for using the softest, possible wood to showcase his saws - everyone called it Ohio “Speedwood” 
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. As you can see it moves right along with the ps63 chain and the Hotwoods porting I do (tuned intake, flow ported , tuned exhaust) Ps63 is NOT race chain (as our beloved member @ huskihl refers to it as) rather it is a 3/8 .050 lo profile chain that has been available for years. It cuts quicker than standard 3/8 .050. It can be made into “race chain” but then again so can standard 3/8 .050. I do all my testing in wny hardwood and with off the roll chains (STIHL rs , Husqvarna c83 and STIHL ps63) to keep everything as fair and equal as possible. The use of a specially-prepared “race chain” in cake-soft pine/balsa wood to showcase the supposed “gains” is completely unethical and dishonest and leaves a stain on the saw performance world … There was a fellow , (von snellink iirc) from Ohio who was infamous for using the softest, possible wood to showcase his saws - everyone called it Ohio “Speedwood” View attachment IMG_5213.mov
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Fabz
Active member
This is my other 562xp wrap handle version - Rowdy pipe, ps63 drive and minor flow-work to the removable transfer caps. I precisely set rakers to .025 with a 3/8 lo pro raker gage purchased from WCS. This gave me much smoother cutting and maybe a whisker faster thru the timber than off the roll ps63. Both saws (562xpg , 562xp wrap) will make for excellent worksaws with a nice blend of power , fuel economy and longevity. 42% gains thru the wood over the stock 562xp running c83 3/8 .050 …. Of course they can be made to cut faster with flow porting , piston and intake mods however they are brand new saws and I’m going to run them as is for awhile … I’m not going to hack up a brand new units and build a hi-compression , machined , ported saw which on the 562xp (imho) is the worst of both worlds : no longer a 500-800hr work saw and far too slow to be a race saw. I’ve a few 562xp carcasses laying around and maybe I’ll build a “Frankensaw” that will really haul the mail to silence the “peanut gallery” and because I can 
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Means little- without independant tests to verify the 42% claims.
I often get saws that do not run when they get here, do when they leave- is that a 100% performance gain?
Matters none what someone dyno says some other saw can do with a bit of welded pipe bolted on- what matters is context and support to your claims- independant testing versus heresay.
I often get saws that do not run when they get here, do when they leave- is that a 100% performance gain?
Matters none what someone dyno says some other saw can do with a bit of welded pipe bolted on- what matters is context and support to your claims- independant testing versus heresay.
Fabz
Active member
Here is the comparison between the ps63 supermini 3/8 lo and the stock Husqvarna c83. Test saw is Rowdy-piped … gettin 6sec for the c83, and 4.9sec for the ps63 so … 6-4.9 = 1.1 , 1.1 / 6 = .183 x 100 = 18.33% faster thru this size 12” ash timber - have to test in 18” wood when I get some logs …
Fabz
Active member
Fabz
Active member
Here’s a good compare-0 between the 562xp and a Piped 262xp - both saws are in excellent mechanical condition. The 562xp has a Rowdy pipe and ps63 drive while the 262xp is piped with off reel c83 and will beat a stock off-the-shelf 562xp This should tell the tale quite nicely and quell the snickering and talk of sandbagging chains for gains. The “tape just don’t lie” 
View attachment new.mov
View attachment new.mov
Fabz
Active member
old school vs new school with same c83chain : the 262xp (62cc 4.8hp) taking a beating from the 562xp (59.8 4.7hp) sing same c83 chain. Tape don’t lie bro
View attachment new.mov
View attachment new.mov