Originally Posted by
Glowgeek
That's true. I believe that Saito wanted the cam advanced 3,75 degrees in this case. Advancing or retarding cam timing to change the power band in performance engines is not uncommon. If Saito wanted the cam timed "straight up" they would have cast the front lobe/gear that way and keyed the rear lobe that way.
Thanks for PM.
Yes, the assymetry is built in, but gets turned around when the functions or rotations are swapped. In the case of your Ti engine, iirc both cylinders use the lobes closest to the spur gear on their cam assemblies as the intake cam. The rear cam however is spinning opposite the front as viewed facing the gear, accounting for the small differences front to rear intake timing, a simple consequence of how the modular cam system plays out in this case . Total intake duration being virtually the same.
The exhaust cam, being a lug keyed add-on is easy (inexpensive) to get spot on by virtue of the drive lug position
Dave, interesting on the sloppy cam assembly.