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? |
jtprettyman |
Jan 15 2020, 08:58 AM
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#2
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Rust Bucket Owner Group: Members Posts: 109 Joined: 5-May 15 From: Murfreesboro Tennessee Member No.: 18,707 Region Association: South East States |
@Superhawk996
Yes, these were done with a very nice set of Mitutoyo digital mics in a controlled metrology lab environment. I spent quite a few years with Toyota in a powertrain facility, know my way around measurement so to speak. I mapped out the dimensions with the intent to report out X and Y axis, but there was basically zero ovality to the mains or pins. When you originally sent me the crank I just bagged and oiled it for eventual use building my original 1.8 and didn't give it a close look. When cleaning it prior to measurement I did see a couple very minor scratches, but verified no raised material on any of them. Overall, this was a very nice crank, and measured out pretty much right where you thought it would. Great to see it getting a new life with @malcolm2 , and happy to help out. |
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