|
I don't know much about BMW's cams, but with previous experience high lift cams with Vanos/Vtec systems have more valve-blowby (or whatever the technical term is) ... when intake and exhaust valves are at one time both open.
This being said, Supercharging or turbocharging with high lift/variable timing cams was not recomended because the boost would blow by through the valves. This is old-school VTEC talk, maybe the S65 is so much more advance that this doesn't make sense now.
Anyways, IMO Cams are one of the last things you should do for the power/$$$ ratio.
GL
|