Hard facts about lightened flywheels

[FMP]

Why do I think someone tried to design a wheel with weights that could be drawn into the center hub? Hope it didn't scatter . Run wide open topped out and pull the weight in running to a turn, gain rpm. Hit the turn weights back outside. Decades ago

[rude tim]

Reducing Reciprocating mass will increase RPM not the weight of a flywheel. One must remember that a mass in motion tends to stay in motion. Unless your boat takes off and lands without dropping any RPM at all there will be no benefit with a lighter flywheel other than crank flex and looks.

[olboatman]

Reducing Reciprocating mass will increase RPM not the weight of a flywheel. One must remember that a mass in motion tends to stay in motion. Unless your boat takes off and lands without dropping any RPM at all there will be no benefit with a lighter flywheel other than crank flex and looks.

Isn't weight part of mass? The less weight should help get that mass in motion quicker. Gary

[FMP]

Wheel is rotating

[Krazymaan]

I know everyone doesn't have a digital scale. But I would like to see real life numbers. I'm always interested in why does your lightweight flywheel weighs 4.2 lbs and why does another lightweight flywheel for the same motor weigh in at 5.4 lbs. and they are supposedly the same flywheel. I'm betting its because thats what the buyer was told without real evidence. I know 1/2 lb isn't ultra critical, but its just interesting to know why it is what it is. Maybe they are all rough cut pretty close and the other grams are from removing material during balancing. I don't know but I am sure someone knows.

[FMP]

Jeff Dunn right? Forget his name.

[rude tim]

Rotational mass in this case flywheel will turn the same RPM lightened or stock, yes it will spin up faster if it is lighter but it will not spin faster. The point is unless your setup is able to never drop any RPM after you hit the throttle a lightened flywheel will not help the acceleration of your boat. Reciprocating mass will effect the overall RPM and acceleration.

The guys that do land speed racing at Bonniville and El Marage like to use heavy flywheels as this helps with getting the car to get and controll traction. The guys that road race like light flywheels for faster acceleration between shifts.

[FMP]

Unless factored to the config and mount correctly recip can shake you to bits

[olboatman]

I know everyone doesn't have a digital scale. But I would like to see real life numbers. I'm always interested in why does your lightweight flywheel weighs 4.2 lbs and why does another lightweight flywheel for the same motor weigh in at 5.4 lbs. and they are supposedly the same flywheel. I'm betting its because thats what the buyer was told without real evidence. I know 1/2 lb isn't ultra critical, but its just interesting to know why it is what it is. Maybe they are all rough cut pretty close and the other grams are from removing material during balancing. I don't know but I am sure someone knows.

I may disagree with 1/2 pound not being ultra critical( when you are drag racing).....thats over 20%! I agree Jeff Dunn may be the one to ask. Gary

[FMP]

Still like less twist on the top of the crank when cornering, chop etc.

[Krazymaan]

That may have been an uneducated typo on my behalf

[FMP]

Like freewheeling a bike front rim with your thumbs and index fingers holding the hub axel and feel the forces.

[Mr. Demeanor]

But with light flywheel your boat might tip over easier.

[Classic18]

��.

[HStream1]

A Lightened Flywheel will give you 200 to 300 more RPMs on the top end.

Rotational mass in this case flywheel will turn the same RPM lightened or stock, yes it will spin up faster if it is lighter but it will not spin faster. The point is unless your setup is able to never drop any RPM after you hit the throttle a lightened flywheel will not help the acceleration of your boat. Reciprocating mass will effect the overall RPM and acceleration.

The guys that do land speed racing at Bonniville and El Marage like to use heavy flywheels as this helps with getting the car to get and controll traction. The guys that road race like light flywheels for faster acceleration between shifts.