anyone ever have encounter an unbalanced flywheel? Vibrations under accleration? Vibrations while in steady cruise?

I get vibrations from, basically the whole car, usually in 3rd gear. I don't usually get that in other gears. I don't think it's the wheels. Any ideas? BTW the flywheel is lightened.

-Shing

 

is there any gains with a light flywheel. I was thinking about that setup.

 

and did they re-balance it after?? I know when people blance their engines, they also include the flywheel AND the clutch assemblies also. But if you just get the flywheel done, I'm not sure if the machine shop wants the clutch and pressure plate too.

 

nah, they just lightened it by no more than 3-4lbs.(from stock 18lbs to probalby 15) They did rebalance it. I asked if they needed anythign else, but the said no. This is suppsoed to be a reputable shop.

KNow the symptoms of one that's out of balance?

 

Well, lighten flywheel doesn't make power... if any gains, it'a b/c there is less rotational mass. But there are always downsides... like if it's too light, driveability suffers.

-Shing

 

No sorry I don't know what the symtoms are.

 

When you lighten a flywheel you get lower rotating mass. This allows the engine to increase and decrease RPMs faster. This may speed up acceleration a little bit (no performance difference at steady state RPMs like peak horsepower). It mostly speeds up shifting with a MT, because it takes less time to sync engine speed with road speed.

 

Autos don't have flywheels.

 

Automatics do have flywheels. The torque converter is mounted to it and so is the starter.

Dave

 

No they don't have flywheels... atleast on a honda they don't. There's this thin plate that I forget the name. Unless Nissan does it way different, I'm sure it's the same way. I could check my manual when I get home.

-Shing

 

a "FLYWHEEL" is to have something to mount the teeth for the starter ring gear. The "flywheel" is only a super thin sheet w/ a ring of teeth around it. It does not serve the same function as a flywheel in a manual.

 

I know that when my cluch went out on my Maxima after a year due to a warped flywheel, I didn't notice any vibrations or anything strange. I would assume that this would be the same as it not being balanced.