As I understand it, the stock crank will live pretty much forever if
you shift at 5,000 RPM. If well prepared (good radius between
bearing surfaces and the rest of the crank, possibly nitrided as
well), it will live a number of seasons shifting at 5,500 RPM. When
you start running it to 6,000 RPM, that's when the longevity drops
pretty quickly - a season or two is about it before the #4 journal
section goes. Some last longer than others. Sometimes when it goes
it doesn't take out much else, sometimes it kills the block and a rod or two.
Tony Drews
At 06:23 PM 5/2/2012, westerneagleracing@att.net wrote:
>FOT,
>I am having the engine in my TR4A race car rebuilt. Are there any
>alternatives
>to a billet crank? We are looking for about 150hp (not a super
>powerful
>170-190).
>Thanks.
>Western Eagle Racing/Ron Jacobs
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