TORQUE!

[Sawrain]

I agree, my intentions wasn’t to say flywheel or piston/crank mass affects torque. Rather that it is interesting that there is a difference at all... whether that is related or not who knows.

Good questions.

Are there any auto tune Jreds, They might be more consistent?

 

[NightRogue]

Rev your saw to 13,000 rpm, let off throttle and put bar in the cut.
That will show you how much stored energy you have in the crank and flywheel on a saw. Lol

But if you're not running the saw you've also stopped giving energy to the momentum to do its job. The momentum works at power rpm go below than that it'll become pointless, imagine a pendulum swinging. A heavier pendulum will keep going after hitting an object but lighter ones will almost stop immediately once it hits something

 

[huskyboy]

Good questions.

Are there any auto tune Jreds, They might be more consistent?

Yes, there is some on the site. Here’s a 560xp and 562xp. Only difference is the smaller 560xp air filter/small mount bar pattern and I do not know if the cranks are the same weight or not... same exact motor and carb/ignition as far as I know. Interesting that there is a difference at all. 560xp562xp

 

[Wonkydonkey]

FYI According to G.Jennings. In the book tuners hand book

Edit: add link
http://www.amrca.com/tech/tuners.pdf

 

[Deets066]

Ok, by a show of hands....
Your modifying your saw for more power.
Porting, ignition advance, muffler mod.

A) add weight to flywheel
B) remove weight from flywheel

I pick B

 

[Sawrain]

Ok, by a show of hands....
Your modifying your saw for more power.
Porting, ignition advance, muffler mod.

A) add weight to flywheel
B) remove weight from flywheel

I pick B

Always B for me.

The spanner in the works was that with a chainsaw we are going fast not wanting to slow down.

Any other motor related passions of mine involve maximum acceleration as a goal, so it’s a simple less weight please.

Well apart from my 2 Stoke dirt bike, a little weight makes them harder to stall in testing conditions.

 

[Spladle160]

It's B. It leaves you with less mas to accelerate to get to your working RPM where you produce HP and do work. Added weight is useless beyond enough to balance and smooth the running of the engine. You're never going to add enough weight or at a significant enough distance from the crank to store enough energy to pull the chain for more than a second in the wood. If you did would you want to hold it?

 

[Definitive Dave]

For some reason I think you've done this.
Does a angle grinder work best of the removal of said fins Asking for a friend...

Flapper wheel works best

 

[Sawrain]

If you did would you want to hold it?

Would be like sawing with a gyroscope, yuk.

 

[huskihl]

Rev your saw to 13,000 rpm, let off throttle and put bar in the cut.
That will show you how much stored energy you have in the crank and flywheel on a saw. Lol

...vs a 12” Vermeer chipper that will chip 2 more logs after its shut down. Momentum

 

[Lightning Performance]

Agreed ^^^

I have a heavier than normal billet flywheel on my 406 SBC. The added weight keeps inertia going so that I can idle at 600 rpm with a .600 lift flat tappet cam. With the lighter flywheel I’d have to be 800-900 to keep it idling.

A heavier flywheel has its place, a saw just isn’t one of them IMHO.

Your lobe centerlines are too close together. Widen the crossover gap and your good. 108 to 112 is a giant leap in idol quality. 110 to 114 is even more noticeable in larger lifts over 600.
You do make the usual trade of hp vs grunt. Imo your better off with the better manners on the street. It will suffer at the drag strip or on any race track but not very much.
Light is better faster every time. Crank weight does not make anything better it just adds manners at lower rpm to compensate for poor idol quality, high compression ratios and lack of vacuum signal.
The heavy always robs overall power across the curve. Been there done that.

My drum chipper will never eat like a flywheel chipper because of the basic design to keep things in motion longer with more force in a smoother delivery package. And... a flywheel chipper will never eat nearly as fast as a drum unit.

Less is more imo unless your talking about money.

 

[Deets066]

Your lobe centerlines are too close together. Widen the crossover gap and your good. 108 to 112 is a giant leap in idol quality. 110 to 114 is even more noticeable in larger lifts over 600.
You do make the usual trade of hp vs grunt. Imo your better off with the better manners on the street. It will suffer at the drag strip or on any race track but not very much.
Light is better faster every time. Crank weight does not make anything better it just adds manners at lower rpm to compensate for poor idol quality, high compression ratios and lack of vacuum signal.
The heavy always robs overall power across the curve. Been there done that.

My drum chipper will never eat like a flywheel chipper because of the basic design to keep things in motion longer with more force in a smoother delivery package. And... a flywheel chipper will never eat nearly as fast as a drum unit.

Less is more imo unless your talking about money.

That makes perfect scents