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Old 09-08-2010, 03:41 AM   #1
SprintSix OP
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Joined: Dec 2009
Location: Ohio
Oddometer: 151
336 cam ?

Is there anyway to tell what cam you have without pulling it? Jugs are off, timing cover is coming off today. I have 2 r100s'. Both are open. One came with a few extras, 1050 kit, reworked dual plug heads, braced swingarm, fork brace. I am combining them into one good bike.
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Old 09-08-2010, 09:03 AM   #2
ericrat
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Location: Cincinnati, OH
Oddometer: 1,150
What a pain

If you are already down that far it probably easier/more accurate to just to pull the cam. But since you asked, here is what I would do if I had oo.

Put a degree wheel on it and a dial indicator on the lifter. It would have been easier to measure from the rocker while the jugs were still on. The fact that you can't use the correct checking clearance will throw you readings way off. On second thought, it might be easier to bolt up a jug and rocker to one side.

Here are the specs on the 336 cam.

http://moragafalconers.org/bmw_336_c...on%20Draft.pdf

The specs for the stock is here.

http://w6rec.com/duane/bmw/engine.htm

The two cams are radically different enough that you should be ablet to tell that you have something other than stock. Do not expect to reproduce the published numbers. Google "degree a camshaft" to get a general idea of the process.

Good luck,

Eric
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Old 09-08-2010, 09:06 AM   #3
bpeckm
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Thanks for the links re: 336 cam.... bookmarked, for "when and if"...

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Old 09-08-2010, 09:40 AM   #4
mykill
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Joined: Feb 2008
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Oddometer: 1,160
stamped

My 336 cam is a late model for simplex chain and is stamped on its nose at the timing sprocket. Not sure how the earlier ones are marked.
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Old 09-08-2010, 10:19 AM   #5
Sniper X
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Location: Central New Mexico, 7420ft above sea level
Oddometer: 33,317
Aren't the lobes way wider (more duration) on the 336 camshaft, and thereby, noticeable by just looking at the lobes?
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Old 09-08-2010, 08:50 PM   #6
bmwrench
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You can tell the 308 from the 336 by looking at them, but I have to have them side by side. There's a noticeable difference. You can also check via the dial indicating method at the lifter. Measure full lift and multiply by 1.39 (the rocker ratio) You can also get an idea by when then the motor starts pulling hard. With a 308, the motor begins making good power at about 4500 RPM. With a 336, about 5500.
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Old 09-14-2010, 04:57 PM   #7
SprintSix OP
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Oddometer: 151
Thanks for the replies. I have one timing cover off and the second ready to pull. Visual inspection seems to indicate that both cams are the same. So unless they are both 336 cams they probably are stock. I will update as I find out more.
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