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 17 2019, 06:30 PM
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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 |
OK it passed the hammer test. very high pitched tuning fork ring. The 1.8 has an even higher ring and lasts longer. If that means anything... (IMG:style_emoticons/default/piratenanner.gif)
I have a set of micrometers coming from a workmate tomorrow. If he forgets, there is always Harbor Freight for $40. With my method of measuring last night, I got a consistent 49.65 on all 4 rod journals. Book says std is 49.97 - 49.98. That puts them at 0.33mm under which is -0.01299. Seams excessive. More accurate measurements tomorrow, I guess. So @Superhawk996 , did this crank ever run in it's current state? Or you took it out and polished it, but never installed? |
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