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I'm on my phone and every time I try to click on it, it disappears.
I'll catch it eventually!

I caught it. Thanks, didn't know about that

 

All of those answer are in my sig.

480-550hp
93 until Aug 2017
Exedy twin

.... if thats the limit of a billet crank...

 

Hey xRoguex, how was the car driven and who build the shortblock? Also, how did you find out the crank was cracked before pulling the motor? I've been running a 100mm billet for a year now without it breaking and it has not had an easy life.

 

Built by David Buschur. At times it had an easy life, others it saw 8500rpm and 13x traps.

The motor was pulled because it has been using A LOT of oil lately and it was time to refresh things. It had just over 30k. on it.

 

 

This was the first ever billet that manley created.

The current LW version did not exist then.

 

There are alot of possibilities. If it was using alot of oil and oil was going into the combustion chamber that can hurt octane and cause knock. Good thing you pulled it apart to refresh /inspect things.
Did you have an aftermarket harmonic dampner ?

 

There was no knock.

No.

 

Or were you running a 14 year old fossilized damper like I recently replaced on my car. Dampers have only one purpose and that is protect the crank from cracking.

 

oem

 

he was referring to oem.

 

i am well aware.

i think more of the cracking issue is due to it being made in china.. and poor quality control... over dampener selection.

 

When will Manley get back to you?

 

Yeah, probably chinesium, but for cranks in general that little strip of rubber in the damper is there to absorb vibration and lessen crank metal fatigue. Overtime rubber hardens. My car is about to have its 15th birthday (please no cards) so when replacing timing belts last fall I decided to include a new damper with fresh rubber. I mention this because I suspect this is something most people would never think about.