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Crankshaft Whip

SECURITY

By SECURITY,
in Engines & Forced Induction

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2rismo Grand Master

2rismo

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Just spoke to my engine builder about another matter and mentioned your situation. Whether or not detonation/lean mixtures caused the problem, for your engine builder to claim that they did there needs to be clear and irrefutable evidence of same.

If there isn't any evidence of this then it's a cop-out and they're full of shit. If there is evidence of it then you haven't got a leg to stand on.

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
Just spoke to my engine builder about another matter and mentioned your situation. Whether or not detonation/lean mixtures caused the problem, for your engine builder to claim that they did there needs to be clear and irrefutable evidence of same.

If there isn't any evidence of this then it's a cop-out and they're full of shit. If there is evidence of it then you haven't got a leg to stand on.

Isn't he your dentist?

SECURITY Grand Master

SECURITY

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Harris do a lot of RB30's and they're close to you Joe. Worth a call. Although keep in mind they dont like to stay on the phone for long cause they're always busy

Thanks Steve, if the engineer returns with results in my favour then i'll give them a call.

Just spoke to my engine builder about another matter and mentioned your situation. Whether or not detonation/lean mixtures caused the problem, for your engine builder to claim that they did there needs to be clear and irrefutable evidence of same.

If there isn't any evidence of this then it's a cop-out and they're full of shit. If there is evidence of it then you haven't got a leg to stand on.

As far as he has told me, he doesnt have an actual report. He says that he's had 2 guys look at it, an engineer (i think) and someone from the NRMA and both said it was caused by detonation whereas the engineer that will provide me with a report said that detonation would not cause the main bearings to go, it would cause the big end bearings to go if anything.

2rismo Grand Master

2rismo

Posted
Posted
whereas the engineer that will provide me with a report said that detonation would not cause the main bearings to go, it would cause the big end bearings to go if anything.

Yep. That's what I would've thought. But here's the thing, dude. It doesn't matter what's caused it, if it has detonated its ring out then there's sweet f**k all you can do.

SECURITY Grand Master

SECURITY

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Yep. That's what I would've thought. But here's the thing, dude. It doesn't matter what's caused it, if it has detonated its ring out then there's sweet f**k all you can do.

he said the pistons and rings are fine as well as the bores so i highly doubt it was detonation. the only part in the entire motor that failed were 2 of the main bearings.

SECURITY Grand Master

SECURITY

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Posted (edited)

Engineer will have a report ready for me by wednesday i hope. i'll ring him today and see if he'll go earlier. no point in speculating if we dont know 100% what happened.

Edited by SECURITY
  • 3 weeks later...
Duncan Grand Master

Duncan

Posted
Posted

I'm sure Joe will give an update sooner or later, but I understand the engineer confirmed there was nothing wrong with the build, the issue was un-related.

It would be good to see the details posted since the reason I heard was unusual and an interesting warning about how small things can build up to a dead motor

SECURITY Grand Master

SECURITY

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Engineer report in:

results are:

bearing failure caused by overfueling/incomplete combustion + a restriction in the oil pickup which caused low oil flow at high RPM. the over fueling + the oil pickup restriction caused the motor to fail.

I'll post up the engineer report once ive edited out my details etc.

Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted (edited)

who tuned the new engine? As from what im reading there it has had problems since it was installed as the 8000klms travelled on an overfueled engine. This is critical on initial run-in as an excessively fueled engine will not allow rings to bed-in and the overfueled combustion chamber to release fuel mixture into sump area on compression stroke.

Edited by DiRTgarage

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