DC350

Hey everyone!

My engine vibrates at around 5500 and then stops above that... I was told it might be a wrong flywheel? an s5 flywheel when i have an s4 engine.. Do they even match up? Or could it be a loose motor mount or something? Happens in nuetral so it couldn't be the driveshaft..Any thoughts? I came up with Broken motor mounts...

BlaCkPlaGUE

Believe it or not, but I've been told a couple times that a bad fanclutch can cause vibration at high rpm.

rotarypower86

It could be your trans mount. I had this problem recently. If you get under your car, and look at the crossmember, you should be able to tell if it's bad by the bushing on the bottom of the trans.

Charles

DC350

Thanks Gent's I'll get under there and take a look....

88AE

Updates!!!!!!!

eriksseven

iTrader: (6)

I had similar shaking. turned out to be a broken motor mount.

88AE

thats what he was tellin me it might be.

DC350

I was told a mis matched flywheel? Is that posible? Or a mis matched front counter weight....

Adam

very true.. happend to me once. the fan turns slower than the moter because of the clutch and the vibration was a pulsing vibration, come and go within seconds, turned out to be the fan clutch

BDC

YES YES YES YES.

The rotors, front counterweight, and flywheel ARE A MATCHED SET. If you are using series 4 rotors w/ a series 5 flywheel, it will be off-balance. Change that flywheel pronto as you are rapidly killing the main bearings!!!!

B

DC350

Thanks B... I am going to rip it all out pretty soon... see what i've got goin on in there.... Nah, its not a worry.. I Have race bearings (I know thats no excuse) But The engine has Very low KM on it too.. And has not been driven that hard yet...

evan

NZConvertible

If it rotates, it can vibrate. Engine, gearbox, driveshaft, diff, axles, wheels...

DC350

Damnit, that just makes the search worse! haha.... I dont think it would be the axles, wheels, diff, or gearbox, because it does it in neutral too....So somethin to do with the engine, or possibly mounts.

turbine

iTrader: (1)

could be a miss at 5500

NZConvertible

Unless the clutch is disengaged, parts of the geaqrbox are spinning when in neutral.

DC350

I'll check it out.

Thanks.