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oldcorollas
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Kita-Ku, Sapporo, Japan
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January 2003

Re: Fly Wheel - Is it True ?

Tue, 11 January 2005 04:29

b1gb3n wrote on Tue, 11 January 2005 15:11

as i understand, lightening flywheel does not change horse power. a lighten flywheel is like lightening ur car. the dyno would still come out the same.

ooooh k...
htf could it change actual hp? Wink

lightening a flywheel (or any drivetrain component, crank and rims included) reduces the mass, and more importantly, the rotational inertia that must be accelerated by the engine at the same time as the rest of the car.

in lower gears, ie 1st/2nd, the rotational mass that needs to be accelerated makes up a larger % of the "effective total mass" (ie rotational + car) than in higher gears.
reducing the rotational mass means that the "effective total mass" of the car is reduced. since f=ma, the cars acceleration is increased.

you can do some simple calculations to work out what a given flywheel mass translates to in "effective total mass". i have done this before but forget the answer Wink

at a guesstimate, the flywheel mass makes up about 20% of the vehicle mass in 1st gear, but feel free to do some calcs..

and fwiw, if the dyno ramp rate is fast enough, then the hp reading can be affected, since the flywheel effect at reducing wheel hp is ONLY in operation when the car is accelerating.. a dyno reading at a static rpm will give an unaffected reading.

Cya, Stewart

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