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Old 06-16-2009, 12:32 AM   #1
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Default How strong are our cranks?

Has anyone seen any crankshaft failures from too much power? I'm wanting to make my built motor work for me. I am going to max out my turbo and then put on a shot of nitrous that will make my differential cry. So, should i worry about the crank?
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Old 06-16-2009, 12:38 AM   #2
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never heard of a crank failure on a miata...actually any car. it's worth trying
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Old 06-16-2009, 12:51 AM   #3
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never seen a crank fail either, at least not on a street machine.
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Old 06-16-2009, 01:39 AM   #4
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'80's EFE's will twist their crank if driven hard. They're generally welded and turned to fix this issue. I think FM had some issues with some of the prototype stoker motors, but I think that was all block's blowing up. I also have never heard of a miata crank failing. You can scrap it by destroying the key way, seal surface, or bearing surface, but that's another story and often repairable.
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Old 06-16-2009, 03:13 AM   #5
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The crank is forged steel, so I doubt you'll have an issue.
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Old 06-16-2009, 03:19 AM   #6
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As markp put it at 500 whp he considered oringing the heads but other than that the **** will hold together.
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