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: 2,738 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 |
Dec 23 2019, 10:08 AM
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#2
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Advanced Member Group: Members Posts: 2,738 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
Both micrometers were checked prior to the last measurements. I believe you are correct on me being a little aggressive on the dial.... I have re-checked both tools and taken new measurements with just a tad of friction....
#1 2.3518 vs. the mid-point of the spec'd range = 0.0095 under #2 2.3520 " " = 0.0093 under #3 2.3517 " " = 0.0092 under #4 1.5662 " " = 0.00815 under ROD Journals day 2 measurement all equal at 1.9595 = 0.0084 under I had planned to take the crank to a shop that I had forgotten about and had heard was reputable, but they are closed 'til January 2nd. I guess I will move on to another project. 2ndly, Why not use plasti-gauge? How do you know what your oil clearance is without it? |
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