Thread: Polishing Crank Lobes?
12-30-2010, 04:49 PM #1
Polishing Crank Lobes?
Has anyone ever done this? Offer any tips? Mine has some scratches that are not deep (can't feel with a thumbnail), but I still want a perfect build.
12-30-2010, 04:53 PM #2
12-30-2010, 05:42 PM #3
Looks nice. Must be trade secrets, huh ? BTW - I meant journals - not the lobes. I could give a crap what they look like LOL. I don't want to ship, jus clean it up my self as best possible.
12-30-2010, 05:50 PM #4
I was wondering what you meant, as no gains in just polishing the lobes.
12-30-2010, 05:53 PM #5
I am not really looking for gains as much as better lubrication at the journals. These cranks take some crazy heat (as evidanced by the lobes heat patterns). Just wanted to make sure they were in the best condition possible before I slapped the cases back together.
12-30-2010, 06:00 PM #6
You definitely what the journals to bearings in spec, no doubt.
12-30-2010, 06:57 PM #7
- Join Date
- Dec 2010
- Rockhampton QLD Australia
Heat marks u see are factory flame harding . Theoredically bearing does not run on the crank but on a film of oil , lines u can see but cant feel are no problem ( we call them oil retension grooves . That being said the biggest problem is ovality and tapper . Get it measured and polished ( I use a blunt 400 grit belt ) to make sure its in spec.
12-31-2010, 10:17 AM #8
Guess I will just hit them with green scotch brite and mic them to ensure in specification.
12-31-2010, 10:21 AM #9
Im not sure a scotch bright pad will do much, those journals are factory hardened ( thats the blue color). If you do try it, make sure you clean it VERY well.
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