Mazda Rotary Club

General => General Technical => Anything Engine/Performance/Tuning related => Topic started by: BlitzBoy on May 28, 2004, 02:02:15 PM

Title: Lightened Flywheel Yes or no
Post by: BlitzBoy on May 28, 2004, 02:02:15 PM
Having taken the engine out, checked the flywheel and its f**ked.

Now im considering a lightened flywheel like the Bonez which weighs in about over 10 pounds, stock weighs 20.

Im looking to push out 300bhp plus atw once the engine is done,
It will be used on the road and the occasional drag race

So should I buy a stock or lightened one?
Title: Lightened Flywheel Yes or no
Post by: g11ary on May 28, 2004, 04:24:54 PM
you will loss a little off the line but the car will be a little more responsive once moving, on 300bhp I doubt you would notice that much, Both my cars are lightened. Get steel not ali.
Title: Lightened Flywheel Yes or no
Post by: BlitzBoy on May 28, 2004, 04:33:27 PM
Cheers Gary, so steel is the way to go then, I was thinking of this one i have decribed below

" ACT flywheels are made from forged Chrome-Moly Steel which The StreetLight weighs only 13.5lbs for enhanced engine response.. Note: Includes appropriate counterweight and hardware."
Title: Lightened Flywheel Yes or no
Post by: bill shurvinton on May 28, 2004, 04:34:58 PM
If you want to drag race then heavier is \'generally\' better.

If you run the numbers, a light flywheel adds a similar inertia in 1st gear to having a passenger in the car. In a heavy car like yours this is not so much of an issue. Mine weights probably less than half yours, so this rotational inertia is significant. by 3rd gear this advantage has dropped to a few kg effective additional mass.

Where is does often help is getting the revs matched for a fast shift. I find the 1st to second shift horrendously slow on most cars, partly because of this, partly because of the huge jump between the gears, and partly because I think dog boxes are a fine concept and totally streetable. And if you double declutch on downshifts it becomes much easier with a light flywheel.
Title: Lightened Flywheel Yes or no
Post by: BlitzBoy on May 28, 2004, 04:41:22 PM
SO Pros of a light flywheel is a more responsive and revvier engine, I also heards u gain a little more top end power is this true?

Cons less torque off the line
Title: Lightened Flywheel Yes or no
Post by: bnaellis on May 28, 2004, 05:08:43 PM
I have one help with acceleration but when say changing from 1st to 2nd I drop from 8,000 rpm to 4,500 which I don\'t like.

rgds
Title: Lightened Flywheel Yes or no
Post by: BlitzBoy on May 28, 2004, 05:26:02 PM
well this isnt the lightest flywheel i can get its sort of mid way.
Cool ACT it is then

See u Brian on Monday, lets see if we can get that beast of urs to launch
Title: Lightened Flywheel Yes or no
Post by: bill shurvinton on May 28, 2004, 09:33:56 PM
QuoteOriginally posted by BNA_ELLIS
I have one help with acceleration but when say changing from 1st to 2nd I drop from 8,000 rpm to 4,500 which I don\'t like.

rgds

You need to practise your shifting technique :-) I love the quick action that a light flywheel gives you.