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.