Thread: BB 454 Gen IV (Mark IV) - Pertronix distributor

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just remember that initial timimg is in crankshaft degrees and distributer timing curves is driven from camshaft--------whatever the degrees talked about in the distributer is doubled at the crankshaft---


12* crank plus 12 * dist equals 36*

Originally Posted by jerry clayton

just remember that initial timimg is in crankshaft degrees and distributer timing curves is driven from camshaft--------whatever the degrees talked about in the distributer is doubled at the crankshaft---


12* crank plus 12 * dist equals 36*

Garzelin,
While Jerry is 100% correct in terminology, to be clear to you since you’re coming to us from Italy but having to communicate in English:
When your Pertronix instruction sheet lists values for your ignition timing they are referencing the degrees of advance, or the limits to the degrees of advance stated in crank degrees Before Top Dead Center (BTDC), as seen on the harmonic balancer with your timing light. You can check this by setting your initial/idle timing at 12° BTDC, install your 12° advance limiter and with your engine running increase your RPM while watching your timing mark with your timing light. You should see your total advance limited to very nearly 24° BTDC.

I hope that this helps you understand your instruction sheet better, and welcome to the forum, by the way.