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Henry Schmidt Henry Schmidt is offline
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Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 6,142
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Interesting post.
Proof positive that opinions will vary.
Anecdotal stories about how a part functions does not negate the superior oiling of the more modern design of a cross drilled crank.
Let's see if I understand one of the complaints, "I would never cross drill a crank because you have to clean the crank after cross drilling?"
Ninety percent of all crank failures in large journal cranks is poor oiling on #2 & #5 bearings.
The GT3 crank survives at high RPM because of the small journal and a huge pump. The first thing we do to a new GT3 crank is cross drilling. Necessary? maybe not but it's cheap and on paper makes sense.
If we are trying to run a large journal crank under greater than average stresses it's foolish to ignore crossing drilling.
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Last edited by Henry Schmidt; 04-18-2009 at 02:26 AM..
Old 04-17-2009, 06:16 PM
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