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Join Date: Aug 2009
Location: Illinois
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Under sized crank

Any reason one would not run a crank that's been turned down? I have always used standard cranks but I have a 2.7 crank that is .25 under on the mains and .75 under on the rods. I know you can't get the rod bearings any more but I have a NOS set for both. Just curious if ther are wear issues or something with using this crank vs Std/std. it would likely go in a stock 2.7 or mildly modded motor.
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78sc coupe
74 914LE
68L coupe
Old 06-23-2018, 08:02 AM
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No problem as long as the crank is properly heat treated again, since the regrind has removed all the surface hardness. Used to be a process called "tufftride" but EPA shut that down, now usually done as nitriding.
Old 06-23-2018, 09:22 AM
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The problem will be the cost of the bearings
The cost, if you can find third cut, will rival the price of a standard crank.
Bruce
Old 06-23-2018, 10:02 AM
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I already have the bearings. I just didn't know if there were issues that would make the crank wear more than usual etc. Heat treating makes sense. I will do some checking in that.
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78sc coupe
74 914LE
68L coupe
Old 06-23-2018, 12:13 PM
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