Quote:
Originally Posted by scicala
Yes, you can just use only the inner diaphragm on the dual diaphragm distributor, but any later carb will still supply way too much vacuum to the diaphragm on the '56 distributor.
The outer diaphragm is just used to retard the spark slightly under acceleration momentarily to avoid spark knock.
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Sal
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zuburg, the '56 Loadomatic distributors have no mechanical timing advance at all. The ignition timing advance is controlled
only by a vacuum signal from a matching carburetor.
The vacuum signal for a Loadomatic varies from .5 to 5 inches of vacuum.
Later carburetors create a distributor vacuum signal with a range of 5 to 20 inches of vacuum. This vacuum signal is only used to 'fine tune' the mechanical timing advance created by a newer distributor.
The '57 and newer Y-block distributors rely almost completely on mechanical timing advance, created and controlled by moving weights inside the distributor.
The two systems aren't the same and don't play well with each other.