Chainsaw Dyno?


Made a short video of the dyno in operation. And the states getting it to where it is today.
 
Fabz said:
They left on account of the sausage-fest. Hi ya doin Kevy, STIHL making ported saws slower than stock? Now don’t get you’re panties all in a bunch , I’m just pullin your leg bro. I’d like to see what ya do with the 592xp, word is they can be made to run better than a built 395xp and that’s sayin something!
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Be nice. Lol.

I like the 592. It’s a bigger 572 in looks and form. Stock, it’s already about 20% faster than a 390 in 26” sugar maple. I don’t have a 395 to run it against, but I videoed the same 390 ported and I’ll also run it against my ported 661 once I get the 592 done. Joe is gonna dyno it before and after porting so you’ll be able to see if my stuff is actually slower than stock
 
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the 592xp looks like a winner on paper and in the wood. I’m sure I’ll get my paws on one in the near future and if it responds like a bigger 572xp then it’ll be Goodnite Irene. .....325BB239-8B10-48DC-B3C2-CA43799D0C63.gif
 
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I checked the listed hp from STIHL as 8.6hp for the stock 881. On your Dyno she ran 10.34hp or 1.74hp more than the STIHL given 8.6hp output. I know temp,humidity , elevation and a whole host of other factors come into play when doing this- do you get consistent results run after run? I think that’s a trick set-up but man that had to cost 5grand or more! It’s all about relative results though , as long as you get consistent measurements. I should send you my 064 , she’ll break 10hp on your Dyno no problem-0! Right now I’m limited to the “wood Dyno”
 
Fabz said:
I checked the listed hp from STIHL as 8.6hp for the stock 881. On your Dyno she ran 10.34hp or 1.74hp more than the STIHL given 8.6hp output. I know temp,humidity , elevation and a whole host of other factors come into play when doing this- do you get consistent results run after run? I think that’s a trick set-up but man that had to cost 5grand or more! It’s all about relative results though , as long as you get consistent measurements. I should send you my 064 , she’ll break 10hp on your Dyno no problem-0! Right now I’m limited to the “wood Dyno”
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Sure, send in the 064 in, would be interesting to see.

Some models are very close, and others are way of..

I wonder how much we rating has to be done for insurance/epa rating


Over 3-4 good runs they will be within 1-2% across 3 runs. Very repeatable setup.

Just like the 881 I ran a couple months ago was 10.13 hp. Vs this 10.3 that is 2% across 2 different saws and a month or so apart.

Yeh, I have close to 8k wrapped up into it, so I could get good repeatable data run after run. Have over 1100 pulls on this setup.

The older saws, 066/044 /395 are closer to the published numbers for some reason.
 
Do you have/be willing to share the results of the STIHL / Husqvarna pro line of saws? Just interested in seeing what your hp #’s are vs STIHL /Husqvarna factory hp #’s. For example the 462c is rated at 5.9hp and the 572xp is 5.8 from the respective companies.....8k is some serious coin no doubt , however it’s a tool that will give results with more precision than cutting in the wood. A guy could find the “perfect” muffler mod down to the .1hp + or - , then play around with the intake / bore carb/ larger carb / filter, K/N , Max flow , velocity stack green weenie etc etc and again achieve very precise results. I know I’ve been able to get 15-18% quicker cut times on the 462c with the stock barrel and around 27-33% with the barrel flow-ported. Not sure what the hp is but bmep says about 7.5-7.8
 
Red97 said:
Maybe. Just have to find one. Was focused on the more easy to get models.

No, not seen one of those yet.
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I’ve been thinking about sending mine to ya. But it’s not stock so not really a fair comparison
 
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