 Is there a "how to.." for crank measurement, and bearing verification? |
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| malcolm2 |
 Dec 16 2019, 11:07 PM
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Advanced Member  Group: Members Posts: 2,749 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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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? |
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| Mark Henry |
Dec 17 2019, 09:24 AM
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I only use STD cranks or standard (under) cranks I get turned down to .010, reason is I won't use a crank that ever had a burnt journal.
Cheap magnaflux, hold a crank by the nose, give it a solid rap with a hammer and it should ring. If it's just a thud it's cracked. This doesn't replace magnaflux, but I've never had a crank fail that passed the ring test. |
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Posts in this topic
malcolm2 Is there a "how to.." for crank measurement Dec 16 2019, 11:07 PM
Superhawk996 @malcolm2
My understanding is that this crank th... Dec 17 2019, 06:17 AM malcolm2 YES, It seems that @jtprettyman has passed it on... Dec 17 2019, 08:46 AM malcolm2 How about the 71mm measurement? Not that it matte... Dec 17 2019, 08:51 AM
Superhawk996
How about the 71mm measurement? Not that it matt... Dec 17 2019, 02:13 PM Mark Henry
How about the 71mm measurement? Not that it mat... Dec 17 2019, 11:26 PM malcolm2
I only use STD cranks or standard (under) cranks ... Dec 17 2019, 09:48 AM Superhawk996 Also for what it’s worth, I provided this crank ... Dec 17 2019, 02:34 PM malcolm2 OK it passed the hammer test. very high pitched t... Dec 17 2019, 06:30 PM Superhawk996
With my method of measuring last night, I got a ... Dec 18 2019, 08:53 AM malcolm2
With my method of measuring last night, I got a... Dec 18 2019, 10:03 AM Superhawk996
Thanks for your input. I certainly hope you don... Dec 18 2019, 02:58 PM malcolm2 OK, maybe not the super duper accurate tools but I... Dec 21 2019, 02:47 PM Superhawk996
OK, maybe not the super duper accurate tools but ... Dec 21 2019, 07:36 PM Mark Henry Sounds like a lot. If you're right about #4 yo... Dec 21 2019, 03:24 PM malcolm2
Your rods should at least have the big ends done.... Jan 20 2020, 08:59 AM Superhawk996
So question 1: how do you "DO" the rod... Jan 20 2020, 12:41 PM malcolm2 Both micrometers were checked prior to the last me... Dec 23 2019, 10:08 AM Superhawk996
Both micrometers were checked prior to the last m... Dec 23 2019, 10:34 AM malcolm2
3) For hobbyists like myself, Plastigage can ser... Dec 23 2019, 10:44 AM malcolm2 UPDATE>>>>>
Todd is the Director o... Jan 14 2020, 08:38 PM Superhawk996 Rod measurements align a whole lot closer to what ... Jan 15 2020, 06:00 AM jtprettyman @Superhawk996
Yes, these were done with a very n... Jan 15 2020, 08:58 AM malcolm2 Rod Balancing, End-to-end. I also wondered how in... Jan 21 2020, 08:30 AM |
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