PDA

View Full Version : R2 cam lobe lift loss



WCP
05-04-2008, 01:18 PM
What is the max allowable cam lobe lift loss for an R2 cam, measured at the tip of the lifter rod? I have one exhaust lobe (#7) that measures 0.279" lift vs. the 0.2833" spec. The only reference on the subject that I can find relates to a '90 Ford 302 and specifies 0.005" max lift loss. All of the other intake and exhaust lifts measure between 0.282 and 0.284". Any advice will be appreciated.

Alan
05-04-2008, 02:05 PM
Did you check the cam when you installed it to verify that it had changed?

WCP
05-04-2008, 04:33 PM
No. The camshaft hasn't been out of the engine since a bore and rebuild by the previous owner who is now deceased. I'm in the process of changing the heads to the correct 282 heads and am simply verifying the cam lift. The apparent loss of 0.004" on #7 exhaust would be split between the lifter and cam lobe I assume.

WCP
05-04-2008, 06:42 PM
That should be 582 heads. Where was my mind when I typed that?

rockfoot
05-05-2008, 11:22 AM
would be split between the lifter and cam lobe

I thought the lift was the lift... without play... the lifter can be as long or short as it wants to be.. shouldn't affect lift. Maybe somebody out there knows how deep the particular cam you are using is hardened. Therein lies the biggest danger. Once it wears below the case hardened surface, then it will wipe very quickly.. .015"-.020".... [?]I think. My 2 cents worth.

1955 President one owner
Moncks Corner, SC
http://i258.photobucket.com/albums/hh279/rbarrett/P1000631.jpghttp://i258.photobucket.com/albums/hh279/rbarrett/259Studebaker.jpg

WCP
05-05-2008, 04:17 PM
Rockfoot, you are right. The lifter wear has nothing to do with lift loss even though there would be comparable wear on the lifter. I wasn't thinking it through.