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Old 08-05-2002, 09:09 AM   #1
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Default Lightened Flywheel Question

hi guys .. ive got a few questions for the techies out there ..
- does a lighter flywheel gives more acceleration ?
- does a lighter flywheel decrease topend speed ?
- to anyone who uses a low cg flywheel - how many grams does
the flywheel weigh ??

ive got an rb x12t and it gives a lot of punch but would like
to use a 18 22 pinion on it but dont want to loose too much
of the punch .. i was thinking of lightening my flywheel to
compensate for the loss by using such a gear ratio .. any
comment suggestions or violent reactions would be appreciated

TIA
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Old 08-05-2002, 09:25 AM   #2
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Anything which lightens the drivetrain will improve acceleration. However, you will lose the inertia of a heavier flywheel so the car will lose speed more easily going up a hill (not too much of a problem there...) and when coasting. Using a lightened flywheel should not decrease the top speed.

You could also try lightening your clutch shoes (drill some holes in them) so that it engages higher up the rev range where the engine has more power. I would start here, unless they are already lightened, as it is cheaper for a new set of shoes than for a new flywheel.
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Old 08-05-2002, 09:33 AM   #3
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thanks for the input .

dont know if my clutch shoe is lightened .. by the way the car
is a v1rr .. m already using a centax clutch so i can adjust when
it engages with a turn of a nut ..
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Old 08-05-2002, 11:51 AM   #4
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Quote:
Originally posted by university_dave
Anything which lightens the drivetrain will improve acceleration. However, you will lose the inertia of a heavier flywheel so the car will lose speed more easily going up a hill (not too much of a problem there...) and when coasting. Using a lightened flywheel should not decrease the top speed.

You could also try lightening your clutch shoes (drill some holes in them) so that it engages higher up the rev range where the engine has more power. I would start here, unless they are already lightened, as it is cheaper for a new set of shoes than for a new flywheel.
Another point to add here... true enough a lighter flywheel does not decrease top speed, but it does not retains the topspeed very well either... Depending on your driving style, you could use this as an advantage...
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Old 08-05-2002, 11:45 PM   #5
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does this mean that u can use this like an engine brake .. or
do you mean car slows down faster when off power (coasting or
free wheeling) .. if so i kinda like this idea .. due to the fact
that i dont use my brakes too much ..

also a follow up question .. how many grams do you guys think
i should take off the flywheel ??

TIA
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Old 08-06-2002, 08:51 AM   #6
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As much like an engine brake as you can with a centrifugal clutch!!! I have no experience of Centax clutches, as I race 1/8th off road.

No idea how much to take off the flywheel, as much as you dare probably. If you start by taking a little off then you can see how much an effect subsequent lightening has. But don't forget that if you have a non-pullstart engine that the flywheel has to take the stress of starting the engine so don't remove so much that it collapses when you try to start it!!! I would suggest drilling some holes into the flywheel rather than trying to sand material off it.
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Old 08-06-2002, 11:12 AM   #7
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Dont forget that they are also balanced. If you lighten it up you will have to rebalance it. If you dont you will eventually kill you front crank bearing.
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Old 08-06-2002, 11:46 AM   #8
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That's a very good point!!!
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Old 08-06-2002, 11:50 AM   #9
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Quote:
Dont forget that they are also balanced. If you lighten it up you will have to rebalance it. If you dont you will eventually kill you front crank bearing
this is the main reason why im not planning to drill holes
what i plan to do is machine turn it and scrape off as much
material as i can .. this will remove matierial evenly on all
sides .. drilling tends to compromise balance (no offense to daves
suggestions ) ..

thanks for the comments guys ..
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