Re: bead-blasting cam brgs

[Ed Lutz <edlutz@domain.elided>]

The machinist may be correct. Blasting piston skirts has long been
done to aid oil retention and lower wear. Never thought about doing it
to a bearing, not sure I want to try it, but it might work.

Ed

Tuesday, April 02, 2002, 8:24:35 AM, you wrote:

JB> I rebuilt a '77 2.0 maybe 10 yrs ago.  I had the head bead-blasted and 
JB> the cam brg surfaces got blasted too.  I raised a big stink about it 
JB> with the shop,  but nothing came of it.  The machinist said he did it 
JB> all the time with no comebacks, and he thought it was a good thing: it 
JB> supposedly keeps some oil adhered to the surface on startup.  Crock of 
JB> shit, methinks.
JB> Then in our machine shop I guestimated the surface RMS, and I guessed it 
JB> was on the order of magnitude of the oil film in the bearing.  Not good.
JB> But heck, I had nothing to loose so I put it back together.  The bottom 
JB> line, it ran fine for at least 20k miles of my hard driving, and then I 
JB> sold it, it went another 50k before it was resold.  And the guy who I 
JB> orig sold it to took it to Canada and Arizona, and he still speaks to 
JB> me, so I guess it served him OK.
JB> YMMV :)
JB> Jan

JB> --
JB> to be removed from alfa, see /bin/digest-subs.cgi
JB> or email "unsubscribe alfa" to majordomo@domain.elided



-- 

--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided