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Thanks for the replies.
It was number 2 bearing that failed 1st time and then number 1 on the last occasion.
I was revving the engine to 7000rpm, 500rpm more than a standard red line on these engines. I do not have an oil temperature guage yet so I don't know what temperature the oil was when the failures happened. I use Penrite 20/60 oil as recommended by the engine builder.
A bearing girdle is being made this time as others have stated that this has improved reliability on other Dolly Sprint engines.
The oil pressure always looked constant when I glanced at it. Generally 70psi at racing speeds, 40psi at idle.
So the concensus is that it is desirable to have the flywheel and clutch when balancing the crank but not critical?
Cheers,
Scott
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