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Originally Posted by 82ACAUTOCRAFT
Another question, when ordering a billet crank, should it be cross drilled or not?
my engine builder says no, and the crank manufacturer tells me hardly anybody uses cross drilled cranks anymore! about you guys? which is better? In the 60's nearly all high performance engines used cross drilled mains.
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The
oil in the 1960's was not as good as it is today, which is why there where more bearing failures in performance applications. Cross drilling is better for the rods no matter how you look at it, but the question is is it necessary?
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Originally Posted by Suomien
A billet crank isn't a forged crank.
Drilling a billet crank would weaken it, and since the point of a billet crank is usually maximum (current market availability) strength, why would you do that?
Not necessary, and makes balancing just that much more involved (need to account for the oil). |
Cross drilling any crank will weaken it. I believe the weight of the
oil only comes into play with the Ford steel cranks that had larger cavities and plugs. I don;t think in general it matters from a balancing aspect for a "standard" cross drilled crank, like a vintage BBC crank.