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Old 01-13-2013, 06:29 AM   #37
Gnarly Adventurer
Joined: Oct 2007
Location: Bavaria
Oddometer: 485
Measurement data

A friend has timed all airhead cams he could get hold of, measuring valve lift in 2 crank angle steps with digital gauges with a resolution of 1/100 mm. He measured lift at the retainers.
He gave the data to me for my personal use, not to publish them in a forum, but today I'll make an exception.

I took the data for the 336 and determined the angles corresponding to 2mm valve lift and 2*1,39mm lift (2mm cam lift).

The angles are

Ex-open Ex-close In-open In-close
Measurement 50 32 30 54 (2mm valve lift)
Measurement 40 24 20 42 (2mm cam lift)
BMW Spec 52 32 32 52 (2mm ????? lift)

Feel free to determine what the ?????? mean.
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