Lightweight pulleys?

[Toobs]

Plus remember that the factory crank pulley is really a harmonic balancer with a rubber dampener wedged in the middle of it... a replacement crank pulley would most likely be just a slab of alloy machined down.
This means that the replacement pulley will have no dampening effect so really if you are considering this you will either put more strain on your bearings or need to have it balanced along with your crank, flywheel, pistons and rods.

If you are not getting your engine rebuilt at the same time you would be better off getting oversized P/S and alternator pulleys.

[mrshin]

Take the belts off your engine briefly, and do some Greek Rev Tuning in the driveway. Can you hear the difference?

[bathurst-91]

It's like a flywheel in a sense, you can't ignore the fact that some energy is stored (as inertia) and some of that energy may go towards accelerating the car when you change up a gear. So lighter isn't necessarily better - but then again, inertia can cause stress on the gearbox (ala porsche 924)

Always pictured this in my mind and have wondered. Has anyone got any info on using a HEAVIER flywheel? Ok so your obviously sacrificing noticeable initial engine acceleration (ie before an engine hits its powerband). But extra inertial force in perhaps the instance of a forced induction (as opposed to an n/a engine setup) would be interesting

That thought aside, it would have to help in keeping the engine revs up between gear changes? though i guess this is negated once you accelerate again..?

Somone want to chime in on this?

[oldcorollas]

could be good on an auto, where slowing down this spinning flywheel results in power transfer to the box..

but for manual? once you let out the clutch, the flywheel MUST go slower to match the gearbox.... so you can only use this stored power whilst slipping the clutch

oh, and might slightly increase the time it takes to slow down when going up a hill but only for the seriously underpowered car.

for an auto, where you can spool up rpm off the line, and revs don't need to drop as much between changes, it is potentially a good thing.... but they have virtually no flywheel anyway???

put it this way... do any auto drag cars run a heavier flywheel?

[Karma Supra]

Always pictured this in my mind and have wondered. Has anyone got any info on using a HEAVIER flywheel?

LOL!!!!!! So its not just my twisted mind that though of that as well!!!!

I once bought a heavier flywheel for my little 1/10th scale RC car because the bloody thing would never idle.. sorted it out a treat lol.

I was half thinking about getting the fly ligtened on my 1G supra, but decided about it as its a little low on bottom end torque for the size of car!

[oldcorollas]

I was half thinking about getting the fly ligtened on my 1G supra, but decided about it as its a little low on bottom end torque for the size of car!

but.... flywheel weight doesn't affect torque well it does... it reduces torque to the wheels when accelerating... so a heavy flywheel makes your poor low end worse.

[Karma Supra]

It makes driving in stop start traffic a hell of a lot more work though!!!!

Now a considerably lighter prop shaft would be much more usefull, sure the radius is small, but on an a-70 supra they are VERY heavy!!!!