engine timing

[aermotor]

I'm confused. I thought the cam gear on 4 cycle engines was 2
X the crankshaft gear, so how can you get 180 out?

[Patrick L.]

Originally Posted by aermotor

I'm confused. I thought the cam gear on 4 cycle engines was 2
X the crankshaft gear, so how can you get 180 out?

The size of the cam gear doesn't have anything with getting 180º out. But, with an 'A' once the cam gear dimple is where it should be [ across from the timing pin hole] it would be very hard to get the timing 180 out. I won't say it would be impossible because people are just about capable of anything. On some other engines it is easier to get the timing 180 out by setting it while the engine is on TDC on exhaust stroke.

[marc hildebrant]

Originally Posted by aermotor

I'm confused. I thought the cam gear on 4 cycle engines was 2
X the crankshaft gear, so how can you get 180 out?

The comment about the 180 degrees referred to the distributor cam. This is the part that the distributor rotor fits into.

Marc

[aermotor]

Meant 2X diameter