> 1. Testing the vacuum advance on the dizzy - Is this a simple
> matter of
> applying vacuum to the unit and watching for the points plate to move?
Depends on what you are testing. If you are just looking for leaks and
basic operation, then that's all you need to do.
> 2. Cylinder compression test - Does it make any sense to perform a
> compression test by turning the crank by hand? Would the
> compression vary
> according to piston speed? Seems to me like the compression
> should be the
> same, regardless of the rate of travel.
There are several reasons that speed affects the reading. Probably the most
significant is that the rings are never a perfect seal to the bore ...
remember those end gaps ?
Try turning the engine by hand, I think you'll find that the speed
dependency is very definite. Turn it slow enough, and it turns fairly easy
(meaning there is no significant compression). Turning it fast enough to
develop 'normal' compression readings by hand is basically impossible ...
you can't put that much torque on the crankshaft.
Even the starter would have a hard time, if it weren't for the effect of the
flywheel.
Randall
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