Can someone please verify if these specs for the M50 non vanos camshafts are correct:
Intake opens: 19 BTDC (9.5 degrees on the cam)
Intake closes: 41 ABDC (20.5 degrees on the cam)
Duration 19+41+180 = 240 degrees
Lobe Center ((41-19)/2+90)= 101 degrees ATDC
Exhaust opens: 35 BBDC (17.5 degrees on the cam)
Exhaust closes:13 ATDC (6.5 degrees on the cam)
Duration 35+13+180 = 228 degrees
Lobe Center (35-13)/2+90= 101 degrees BTDC
Timing for nonvanos intakecams
Exhaust opens: 41 BBDC (20.5 degrees on the cam)
Exhaust closes: 19 ATDC (9.5 degrees on the cam)
Duration 41+19+180 =240 degrees
Lobe Center (41-19)/2+90= 101 degrees BTDC
Found here:
I've begun to degree my camshafts. My setup consist of M50NV block & head, with a S52 crank, M54 pistons, 135mm Non Vanos Rods, 0.140" Cometic Head Gasket and Dual intake cams.
It makes sense to me that the TDC is different from the timing marks. I know the exhaust camshaft block will not line up, because I'm using a stock non vanos intake cam in its place, but does it make sense that the intake camshaft doesn't line up like a stock camshaft because of the head spacer?
This is how the back my camshafts look with the intake set at 19 degrees BTDC at 0.050":
Rotated twice around verified angle and opening lift point and checked for interference and everything seems to work out. Is this correct?
Intake opens: 19 BTDC (9.5 degrees on the cam)
Intake closes: 41 ABDC (20.5 degrees on the cam)
Duration 19+41+180 = 240 degrees
Lobe Center ((41-19)/2+90)= 101 degrees ATDC
Exhaust opens: 35 BBDC (17.5 degrees on the cam)
Exhaust closes:13 ATDC (6.5 degrees on the cam)
Duration 35+13+180 = 228 degrees
Lobe Center (35-13)/2+90= 101 degrees BTDC
Timing for nonvanos intakecams
Exhaust opens: 41 BBDC (20.5 degrees on the cam)
Exhaust closes: 19 ATDC (9.5 degrees on the cam)
Duration 41+19+180 =240 degrees
Lobe Center (41-19)/2+90= 101 degrees BTDC
Found here:
I've begun to degree my camshafts. My setup consist of M50NV block & head, with a S52 crank, M54 pistons, 135mm Non Vanos Rods, 0.140" Cometic Head Gasket and Dual intake cams.
It makes sense to me that the TDC is different from the timing marks. I know the exhaust camshaft block will not line up, because I'm using a stock non vanos intake cam in its place, but does it make sense that the intake camshaft doesn't line up like a stock camshaft because of the head spacer?
This is how the back my camshafts look with the intake set at 19 degrees BTDC at 0.050":
Rotated twice around verified angle and opening lift point and checked for interference and everything seems to work out. Is this correct?