Quote, originally posted by koko5869 » i was thinking each cam has a different profile? but that doesn't make much sense either.
On the intake cam, there are 12 lobes - are all 12 lobes the exact same shape with the exact same timing? Or do 6 have one timing profile and 6 different profile? Whoever measured these cams, didn't account for the 15° V and rocker-arm arrangement to measure effective lift/duration when installed. They measured it as if it were an inline-6.
The 24v should have four different cam profiles, intake & exhaust for front-bank cylinders; intake & exhaust for rear-bank cylinders. This arrangement compensates for the ~3" difference in intake runner length - just like the MKIV 12v engine. If this were not the case, then it would basically be 2 three-cylinder engines with two entirely different torque peaks which would be horrible for tuning and longevity.
So who knows the REAL "as-installed" data with these cams and not just the measured numbers off the bench????
Modified by phatvw at 9:59 AM 12-5-2007