Another chainsaw dyno...

[Nutball]

Dyno some battery saws.

 

[Red97]

So now it is making stock HP according to the book right? I was surprised to see 1.14HP stock and not nearly 2HP ported. I wonder how accurate the dyno is with low power numbers. I know it shouldn't be a problem, but some devices aren't so accurate towards the bottom of their range.

1.14 to 2 is 75% that is a tall order for any saw.

I do know 84 dl of full size chain and rotating the impeller puts a good load on 25cc...

Maybe they test off the crank? Idk.

But before/after same saw same everything what really matters.

Not huge gain, but pretty fair.

 

[Nutball]

I was thinking more along 1.5 stock to 2.0 ported, but 28% is good. The dyno now confirms why they still feel weaker than a stock 35cc after porting. I'd also hope for 2.5hp in keeping with my own goal of .1HP/cc for any engine, but I imagine the 90deg exhaust and built in decomp would prevent that.


Do you think it possible to measure losses in the system to compensate in the numbers?

 

[RI Chevy]

Dyno some battery saws.

Cool. Go buy 1 and send it in. Lol

 

[Red97]

See if this one can dethrone the current 20cc champ..


Another 2511t

 

[Hedgerow]

you coming to race Labor Day weekend in MI? races 3 days in a row with a lot of really fast guys. test out that 5 cube....you and Clint can ride together.

What are the classes?

 

[Hedgerow]

Unless Matt has softer lips than Carrie, she will be riding shotgun

That would be a no from me...
But thanks for the offer...

 

[Agent Smith]

See if this one can dethrone the current 20cc champ..

View attachment 247336
Another 2511t

Interesting looking lower xfer operation there

 

[Red97]

Interesting looking lower xfer operation there

They have a plug doohicky that fits in and restricts that tunnel... changes the direction a bit. First saw still has it in. May leave it out of the 2nd...

 

[Nutball]

They have a plug doohicky that fits in and restricts that tunnel... changes the direction a bit. First saw still has it in. May leave it out of the 2nd...

Great idea, now's your chance to do a stock test with and without the insert, the only problem being the empty hole in the top of the plugged transfer.

 

[Agent Smith]

They have a plug doohicky that fits in and restricts that tunnel... changes the direction a bit. First saw still has it in. May leave it out of the 2nd...

Im thinking they're in there for velocity purposes but you never know. Testing is the fun of it all

 

[Red97]

Great idea, now's your chance to do a stock test with and without the insert, the only problem being the empty hole in the top of the plugged transfer.

Already ported and back together.

See if this recipe works better than the other.

Im thinking they're in there for velocity purposes but you never know. Testing is the fun of it all

Very well could be, the whole cylinder is kind of twisted. See if it works out tomorrow .

 

[Armbru84]

What are the classes?

3, 5 pipe, open. Bike saws one of the days also. Good payouts if you place.

 

[dall]

Unless Matt has softer lips than Carrie, she will be riding shotgun

no contest there yours is the softest lol
hows you

 

[Red97]

Behold the Awesomeness!!!!

 

[Deets066]

Behold the Awesomeness!!!!
View attachment 247381

All that power....
Might have to turn that into a rear handle model. You know, for safety n’stuff

 

[Red97]

All that power....
Might have to turn that into a rear handle model. You know, for safety n’stuff

Installed a stiff return spring.

Grab the throttle too fast it will set the brake.

Well almost

 

[MustangMike]

For a second there, I did not see the decimal!

 

[Nutball]

Add 100 more cc's and you won't need the decimal.

 

[Red97]

Add 100 more cc's and you won't need the decimal.

That will be the project in a few weeks