Coincidence
Just about any crankshaft will live to 10 to 5 zeros or
1,000,000 cycles. At 7000 RPM that is 142 minutes.
Just about the lenght of a NASCAR race :)
Let alone a 15 minute Reno race.
Paul Lamar
10 to the 5th is only 100,000 :)
Bob W.
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Right Bob! My mistake. Only 100,000 cycles or 14.2 minutes :)
They must be using something better than just straight air melt 4340 in NASCAR :)
I always thought the fatigue limit for 4340 was closer to one million cycles.
There seems to be some conflicting data. Second chart shows .18% carbon steel
(b) to be between 10 to the 6th and 10 to the 7th or 1,000,000 to 10,000,000
Paul Lamar
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