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Old 01-04-2013, 04:47 PM   #12
mattcfish
R90SS/6
 
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Joined: Feb 2008
Location: Bellingham, WA RAIN or shine
Oddometer: 212
Quote:
Originally Posted by SamH View Post
Ok, I measured up the cams tonight as best I could. Put them both in the lathe and setup the dial gauge. I could only measure lift.

The cam marked 921 measured 6.75mm lift on all four lobes, x1.39 = 9.3825mm or 0.3693"

The cam marked 630 measured 7.64 lift or near enough on all the lobes, x1.39 = 10.6196mm or 0.4180"

Is lift alone enough to identify these two? Is there a list of specs somewhere?
BMW specs.
308 has a lift of 9.4mm
336 has a lift of 10.68mm
284 has a lift of 8.62mm

Lucky you. #630 has the lift of a 336. An early one with a key drive on the OP is a rare thing......#921 is a 308.
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