Snapped Crankshaft (with pics)

[mee]

I'm about to replace my clutch and probably my flywheel. I'm considering using a LWF but this is the first I've heard of a balance issue. I have some questions. Please excuse my ignorance, I'll try to be concise. (this is for a daily driver thats only driven hard about 1% of the time)

Doesn't the factory balance cranks and flywheels separately so that any pair would be balanced as a unit?

If they balance the whole assembly together then wouldn't replacing the stock factory flywheel with an identical OEM flywheel be just as bad as an aftermarket flywheel? (balance wise not considering any dampening effect)

I see some aftermarket flywheels advertised as checked for "zero-balance". Is that true for OEM replacements?

Does the dual mass flywheel dampen vibration to the point that no balancing is required? Even at the factory?

One thing I can tell you is after I had my aftermarket flywheel installed the transmission is noticably louder on acceleration and at idle. On the positive note the car appears to reach the higher RPM's faster.

What clutch did you use? The OEM unsprung or an aftermarket sprung-hub clutch? I'm also wondering if the clutch in the OP was sprung or not. This could make a significant difference.

[SNaray8442]

What I stated isn't just what I FEEL, but I have collected the data to support the claim-

:cheers:

You're a dying breed, sir, and I applaud your ethics.

[SNaray8442]

Forget all that I say Bravo! 12,000 track miles, operating beyond the engines manufactured capacity. That is amazing pure and simple, I have not seen 12kmiles track racing and you don't want to know the failures I've had! This should not come as a surprise, but unless you're gonna break the engine down and inspect it after every race as the pro's do then you couldn't hope to know about it and I would have to say that even with an inspection you would not find it. :D

Amen! If you're gonna race, stress, push, and abuse it; be prepared to pay to play.