Cam Identification

[Slavs]

Now, that you guys have helped me in identifying my tii pistons (I'm not that familiar with the Tii stuff), I'm trying to ID the cam.

It was a stock cam, but someone decided to regrind it. The rockers or tappets require lash caps. So, I'm sure I won't be using it. But, I'd still like to know what it is.

Whoever reground it also etched "So Cal Cams - 275 degree" on to the chain sprocket mounting surface. Most people who are looking for a cam are looking for something that is in the 280ish or 290ish range. I don't like the way the M10 idles with a high duration cam, at least not for the street. The factory used the 264 degree cam for the standard and the "ti" and "tii" variants. And, that is good enough for me. But, the 275 seems like it would be almost stock, unless it is a different kind of measurement. I've heard the Germans measure duration differently from the Americans.

[AustrianVespaGuy]

I *think* the way BMW measures the cams is just the duration of a single lobe, and both intake and exhaust lobes are the same duration, but they don't tell you the lift.  I certainly do prefer the breakdown of individual lift and duration for both intake and exhaust lobes personally, oh well!

[Mjimport]

I was hoping someone could verify that I have a stock cam.  From what I have researched, it doesn't appear to be a regrind (lobes are above the shaft surface).  On the cam gear end it is stamped "BINF", what does that mean?

 

Also, just one blue paint line on the shaft.

I see someone has written the cylinder numbers in sharpie on the rockers.  Does that mean it has been rebuilt at some point? 

 

Edited January 24, 2021 by Mjimport

[Son of Marty]

Is there any number stamped on the cam flange behind the gear not the face as in your picture stock cams mostly will have a 2 stamped there.

[Mjimport]

I didn't see any numbers, without trying to turn the shaft..