lightened fly wheels

[RabbitJockey]

i'm getting my hybrid motor built, should i get my flywheel lightened? or does it make it run rougher

[RabbitJockey]

also does anyone have an idea of how much it cost to have your bottom end balanced

[Rabbit on Roids]

flywheel, do it.
balancing, do it yourself, its good practice. professionals will charge way way too much for the amount of work required.

[arb]

flywheel, do it.

Manual flywheel ?

balancing, do it yourself, its good practice. professionals will charge way way too much for the amount of work required.

Yeah, if you're talking about static balancing, get a "drug dealer's" scale and do it yourself. If you want a real balance, start with the static balance and pay a pro to do a dynamic balance. Then you'll have a smooth engine, but likely making your flywheel lighter will negate and smoothness you got from the dynamic balancing.

[ryanp]

are there any links to static balance how to's?? i'd love to have a crack!

Cheers

Ryan

[arb]

are there any links to static balance how to's?? i'd love to have a crack!

Cheers

Ryan

There have been a number of books written on "Blue printing your engine" - basically, you weigh the 4 pistons, and shave a bit off the skirts of the 3 heavier ones until they are within 0.1g (or how ever close you want to get) and same with each moving component (rods, caps, etc) Some guys even do the valve train, but I think that's a bit over the top.

You might find this on the net too.

[Rabbit TD]

I think that the RPM's these run it's really not necessary and these things are gonna have some vibration no matter what, and balancing is not making one thing stronger which is what I would worry about if I was going to try to make a bunch of HP.  I'd spend that money on something that would make a known difference like a Giles pump or something of that nature.

[RabbitJockey]

balancing is supposed to be only 100-200 to have done. getting the crank balanced, then doing a static balance is all you need to do on a 4 cylinder since it's in line, but you need the little hangy thing to do the connecting rod, which i'm sure i could rig up... i dunno maybe i will do it.  does a lightened fly wheel really make them rough?  i was only thinking of going down to 8-9 pounds

[Rabbit on Roids]

8 or 9 pounds is way light on a diesel. they usually use those on hot rod revver gas engines. isnt gonna have much torque with that flywheel.

[zukgod1]

I agree with Libby.

After driving with both OE and lightened flywheels I don't feel there is an advantage to a lightened one at all.

As a matter a fact I think it hurts you off the line.

These little suckers just don't rev fast period and they aren't supposed to either.

Sure you may get a .010 faster time with a lightened flywheel but your going to loos your off the line from a stop sign torque.

Just my 2 cents.

[rabbitman]

I'd rather have the smoothness of a heavy flywheel. I've heard nonsense like "a light flywheel won't maintain it's speed on a hill as good as a heavy one", but that's wrong, the engine is what's making the power. I guess a light one would help in like 1st and maybe 2nd gear since the rpms are changing fast but after that it's just along for the ride.

[foxracer1]

I have a lightened flywheel and have no complaints. Revs are snappier but not neck snapping.

[theman53]

It is Newton's first law at work...Man I can't believe I just used something I learned at school

[Rabbit TD]

I agree with Libby.

After driving with both OE and lightened flywheels I don't feel there is an advantage to a lightened one at all.

As a matter a fact I think it hurts you off the line.

These little suckers just don't rev fast period and they aren't supposed to either.

Sure you may get a .010 faster time with a lightened flywheel but your going to loos your off the line from a stop sign torque.

Just my 2 cents.

And more than likely the .010 quicker is just due to the car being just a little lighter period.

[RabbitJockey]

i get it, they just have more momentum. so it wont die off as much when leaving off the clutch