Dumb Question Thread - No Flaming Allowed

[Slideways]

How do you know it’s time to re-grease monoball FCABs? Hearing creaking from the front end this weekend at Sebring track event during low speed driving when turning the wheel, tapping the brakes, and even when engaging clutch to start rolling out. Can even slightly feel the creaking so has me thinking it must be LCA related. Have Turner monoball FCAB and my indy had supposedly re-greased them when installing new LCAs a year ago..

Only other recent front end install was a Hotchkis fsb but I had made sure the GC endlinks were installed tight to prevent any end-link clanking/play. Iirc i was hearing the creaks slightly even before the fsb install, just more pronounced now after two b2b days at Sebring.

It sounds like the grease is new on the Hotchkis poly mounts, so it could be those turner FCABs. A few people have gone back to stock FCABs.

Team Schirmer offers an offset FCAB mount with an insert in their full kinematics kit. They setup dedicated Nurburgring track cars, so there might be a reason why they have not gone monoball in that location.

[BigRussia]

How do you know it’s time to re-grease monoball FCABs? Hearing creaking from the front end this weekend at Sebring track event during low speed driving when turning the wheel, tapping the brakes, and even when engaging clutch to start rolling out. Can even slightly feel the creaking so has me thinking it must be LCA related. Have Turner monoball FCAB and my indy had supposedly re-greased them when installing new LCAs a year ago..

Only other recent front end install was a Hotchkis fsb but I had made sure the GC endlinks were installed tight to prevent any end-link clanking/play. Iirc i was hearing the creaks slightly even before the fsb install, just more pronounced now after two b2b days at Sebring.

[IamFODI]

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.

If it's a damper, that means it works by absorbing vibrations.

A balancer is different; it has a counterweight on it to balance the rotating assembly (and probably a damping element as well).

Without a damper, your engine would make more NVH and not live as long. Without a balancer, your engine would run like a jackhammer and grenade in short order.

Pretty sure the crank pulley and maybe the flywheel in this engine act as dampers but not balancers. The engine is internally balanced. I can't imagine how an I6 would ever need an external balancer.

You might be right about the DMF technically doing more than the crank pulley to absorb vibration, though I'd imagine they absorb different frequencies from different sources, so they're probably complementary more than comparable.

[fattycharged]

How much, if any, play is acceptable on the output of the trans?

*rotational



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[zzyzx85]

Harmonic balancer or vibration damper?

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.