Another chainsaw dyno...

[Homelite750]

How bout a video of how tuning effects performance. Run a saw with perfect tune then compare to a little too lean and a little too rich and compare.

 

[Red97]

How bout a video of how tuning effects performance. Run a saw with perfect tune then compare to a little too lean and a little too rich and compare.

 

[Red97]

 

[qurotro]

That's some torque right there..

 

[RI Chevy]

How does it stack up to other 80cc saws? Comparison graph?

 

[Red97]

How does it stack up to other 80cc saws? Comparison graph?

Echo 80cc
And a 390xp which is very close to the 500i

 

[RI Chevy]

Interesting. The Torque is close, but HP is much less. TY sir.

 

[Dieselshawn]

I think the next saw on dyno will be the IEL Super 52 twin 2 man saw

 

[Bigmac]

Echo 80cc
And a 390xp which is very close to the 500i
View attachment 320727

The poor old 1963-64 homie can’t rev, probably not bad power for the era, but she doesn’t rev at all!

 

[Thesandman]

Something as simple as a clogged vs. clean air filter on the dyno would be cool. Maybe compare to muffler mod gains in percentage. “Sharpen your chain and clean your air filter for a dirt cheap bump in performance “

Another could be stale gas, fresh gas, canned gas compared on the dyno.

Maybe even better, run a performance filter like redbeards vs stock on a cs590 clean and dirty. I would buy the filter.

 

[qurotro]

The poor old 1963-64 homie can’t rev, probably not bad power for the era, but she doesn’t rev at all!

That homie is on par with a stock 395 in torque i guess.

 

[Red97]

That homie is on par with a stock 395 in torque i guess.

Stock 395 is about 5.6ftlb

 

[NightRogue]

That awkward moment when tq is higher than hp.....

 

[RI Chevy]

Is there a way to try and get more HP out of these older saws that lug? Without sacraficing the torque? Be cool to see a Mac 125 or Dolmar 166 on the Dyno!

 

[Dieselshawn]

That awkward moment when tq is higher than hp.....

Like a 2 stroke diesel

 

[wcorey]

Is there a way to try and get more HP out of these older saws that lug? Without sacraficing the torque?

I guess that depends on what you mean by "Without sacrificing the torque?"...

Sure you can get more hp by doing the typical things like enlarging the exhaust/intake tract, stiffer reeds, port timing etc. But..
Basically, hp is gained by moving the peak torque up in the rpm range and the physics of these engines seem to dictate that the higher the rpm that this occurs, the narrower/pointier the torque curve (and thus the 'power band') gets.

It's always going to be a balancing act and the art/science/magic in 'porting' is in achieving the most of each in the right proportion for the platform/application.

 

[jacob j.]

Is there a way to try and get more HP out of these older saws that lug? Without sacraficing the torque? Be cool to see a Mac 125 or Dolmar 166 on the Dyno!

I'm working on getting Joe a 125 to play with - I just need to make sure I got one that starts easily enough.

 

[huskihl]

Is there a way to try and get more HP out of these older saws that lug? Without sacraficing the torque? Be cool to see a Mac 125 or Dolmar 166 on the Dyno!

We put my 166 on it early on, I believe. Seems it was 8.5hp. Or maybe I crs

 

[farminkarman]

Is there a way to try and get more HP out of these older saws that lug? Without sacraficing the torque? Be cool to see a Mac 125 or Dolmar 166 on the Dyno!

I am not sure if this would be true or not in the old saws, but the bottom ends might not be up to the task of turning a bunch more rpm without coming unglued.

 

[RI Chevy]

Thanks for the replies guys