Is there a "how to.." for crank measurement, and bearing verification? |
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Is there a "how to.." for crank measurement, and bearing verification? |
malcolm2 |
Dec 16 2019, 11:07 PM
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#1
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I am gonna make a 2 liter from my 1.8. So I have a refreshed 71mm crank that I have been told has been ground to -0.010.
I measured as best as I can with a digital mic and got about 59.66 on the mains and 49.65 on the rod journals. Where can I find the STD specs and ranges ? were they 60 and 50, respectively? Since I know nothing about this crank, how can I verify the 71 mm measurement? |
malcolm2 |
Jan 14 2020, 08:38 PM
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#2
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Advanced Member Group: Members Posts: 2,747 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
UPDATE>>>>>
Todd is the Director of Quality for an automotive parts maker, and he measured the crank in is lab.... much lighter touch than me. (IMG:style_emoticons/default/blink.gif) Here is what he measured... #4 -0.009350 #3 -0.009843 #2 -0.009843 #1 -0.009500 The RODS.... from the fan. -0.010026 -0.010105 -0.009908 -0.010194 At 1st look, I am thinking, " GO WITH IT". Next step will be a plasti-gauge check. I need to check the rods now. What is the factory spec for the big end? |
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