Rotor position at TDC

[fried okra]

Thanks JayJay....will need to check if can see the valves at TDC....just been looking at the piston.

Should the distributor rotor be at #1 plug contact in distributor on both exhaust and compression stroke when piston at TDC?

Yep, been been rotating engine clockwise when viewed from the front....thx.

[JayJay]

Originally Posted by fried okra

Thanks JayJay....will need to check if can see the valves at TDC....just been looking at the piston.

Should the distributor rotor be at #1 plug contact in distributor on both exhaust and compression stroke when piston at TDC?

Yep, been been rotating engine clockwise when viewed from the front....thx.

Distributor is driven by the camshaft. One revolution of the camshaft (and one revolution of the distributor) equals two revolutions of the crankshaft. So no, TDC of #1 cylinder on compression the distributor rotor points to #1, and at TDC of #1 cylinder on exhaust (which is TDC on compression of #4 cylinder) the rotor points to #4.

[ModelA29]

Originally Posted by fried okra

Should the distributor rotor be at #1 plug contact in distributor on both exhaust and compression stroke when piston at TDC?

No it only points at #1 when it fires on the compression stroke.
It turns 1/2 crank speed so it fires the plug every other up stroke of the piston.

[mcgarrett]

fried okra,
I have found this to be the most helpful information source when it concerns ignition timing, tune-ups, etc.

http://www.modelabasics.com/Ignition.htm

[mcgarrett]

http://www.modelabasics.com/Ignition.htm