I have just installed new 105 cams. Found the equal lift points and marked cam pinions and the crankcase adjacent. Crank set at 4deg BTDC. Inserted idler and crank pinion. Rotated crank pinion until a keyway lined up and inserted the key. Rotated engine forward by 360+50 degrees and inserted front camwheel into mesh. Next, checking, I get rear cylinder equal lift point at 7.1deg BTC and the front at 2.9deg BTDC. It seems to be the case that one or other of the cams is not inserted correctly into its wheel. There is 4.2deg error.
So questions.
1) is this timing acceptable?
2) If not, how can it be improved? (combinations of a different keyway on the crank pinion - 1.5 deg - and/or moving a camwheel by a tooth - 7.5 deg )
3) should I be moving a cam relative to its wheel?
This is a 1948 Rapide engine with 8:1 CR pistons
So questions.
1) is this timing acceptable?
2) If not, how can it be improved? (combinations of a different keyway on the crank pinion - 1.5 deg - and/or moving a camwheel by a tooth - 7.5 deg )
3) should I be moving a cam relative to its wheel?
This is a 1948 Rapide engine with 8:1 CR pistons