Another chainsaw dyno...

[Nutball]

It would be cheap and easy to mail in a modded carb if someone has one.

 

[Bigmac]

Big gains on the 8000 too! She was pretty pathetic stock lol. Doesn't the 800 have a better cylinder than the 8000? Capable of more power?

Ya when a ported 4910 has more power than a stock cs 800o, I would agree, ya that’s pathetic stock

 

[Bigmac]

It would be interesting to see if and how much a modded carb changes the DYNO results.
How the torque and HP curves are affected...
Just thinking outloud.

I would guess a well modified or larger carb will always make more power on the dyno, with limits of course. It works that way on everything else on the dyno, yet most people stay with the smaller carb because of easy of use, tuning ease and other reasons. But peak power there will usually be gains with a bigger carb, a big carb 395 would be interesting, it has enough cc to justify a larger carb than a 60cc Mac from the 70’s, if 044 carbs are gains on an 026 for wide open power. Most of the modern 70cc saws have a well sized carb, any larger imho would see decent gains, and the larger saws might still keep there manners. I just put huge carbs on a quad, and the manner are excellent for drag racing.

 

[MustangMike]

When tuning and throttle response are important, bigger is not always better.

 

[RI Chevy]

I was just thinking a bigger "usable" carb. One that you could use for work, not race. Like a simple bigger bolt on that would run and operate like oem.

 

[Johnmn]

I was just thinking a bigger "usable" carb. One that you could use for work, not race. Like a simple bigger bolt on that would run and operate like oem.

Like a 357 carb on a 346, or a 044 on a 361 ect.

 

[ayoungtexan]

Well... This is a little ripper.

View attachment 293059 View attachment 293060 View attachment 293061

That’s impressive! I like these new Echoes and their gains from porting

 

[ayoungtexan]

Stock vs ported cs 8000View attachment 293349
View attachment 293350

You turned that into a ripper! Stock was pathetic, nice work Joe!

 

[ayoungtexan]

395 xpg.View attachment 293380 View attachment 293381

Looks like that 395 got some nice gains!

 

[NightRogue]

When tuning and throttle response are important, bigger is not always better.

Gotta agree on that, bigger carb likes shorter intake duration on small cc motor. Smaller carb benefits from more intake duration

Small = more velocity and good for low end tq
Big = more volume and good for high rpm hp

Sent from my INE-LX2r using Tapatalk

 

[Hinerman]

Stock vs ported cs 8000View attachment 293349
View attachment 293350

The 8000 you ported, that I ran at Kevin's GTG this year, was one of the 2 saws that impressed me the most that weekend. There were a lot of strong saws there, but only 2 are etched in my mind above all the others. The other was the stroked 661. Very impressive and well done sir.

 

[Red97]

Broken in (30-40 tanks) stock 7310


Removed spark screen was the only thing done. These really do wake up... much better than my brand new one...

 

[huskyboy]

Broken in (30-40 tanks) stock 7310
View attachment 293644

Removed spark screen was the only thing done. These really do wake up... much better than my brand new one...

Yup, seems comparing non broken in saws to broken in ones really isn’t accurate?

 

[Red97]

Yup, seems comparing non broken in saws to broken in ones really isn’t accurate?

When I ran the 70cc they all were new/fresh saws.

As more of the same model are run it should help with a "average"

 

[Red97]

Brand new 461r vs the broken in echo.

 

[Red97]

Yup, seems comparing non broken in saws to broken in ones really isn’t accurate?

The main goal is the before/after runs.

All the rest of the numbers are just targets.

 

[huskyboy]

Brand new 461r vs the broken in echo.
View attachment 293649
View attachment 293650

Wow 461 has a lot more torque and hp at low rpm than the 7310.

 

[TreeLife]

Brand new 461r vs the broken in echo.
View attachment 293649
View attachment 293650

Very interesting!

 

[RI Chevy]

Not quite sure I understand the graph. Why pick the point that the graphs cross? I thought you were looking for peak HP and Torque?

 

[Bigmac]

Not quite sure I understand the graph. Why pick the point that the graphs cross? I thought you were looking for peak HP and Torque?

The graphs are the same regardless, that’s just the point where Joe decided to put a line! LOL I don’t know if Joe has the ability to put two lines up, kind of a compromise! Not to get too sidetracked off the Dino, but it would be interesting to see what each saw ran like in comparison as they were, the echo have an advantage +9750 It would be faster if you didn’t dog it in. Anything less than cutting RPM is worthless right, 8K peak is pretty low