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Ignition timing retards

Old 07-13-2010, 02:03 PM
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Exclamation Ignition timing retards

why does my ignition timing retard from 10 degrees to 0 when i rev the engine to appprox 2000 rpm,i have tried 3 different ignition modules and 2 distrbutors , it is a carburated 502 Mercruiser
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Old 07-13-2010, 02:12 PM
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Originally Posted by markku4444
why does my ignition timing retard from 10 degrees to 0 when i rev the engine to appprox 2000 rpm,i have tried 3 different ignition modules and 2 distrbutors , it is a carburated 502 Mercruiser
If it's a thunderbolt V ignition, they have ignition retard function built in. It is controlled by the knock deterctor system. If that malfunctions or the connections between it and the ignition module are loose, it will pull timing.

Putting a thunderbolt V module on a IV system will cause the same thing.
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Old 07-13-2010, 02:48 PM
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Originally Posted by apollard
If it's a thunderbolt V ignition, they have ignition retard function built in. It is controlled by the knock deterctor system. If that malfunctions or the connections between it and the ignition module are loose, it will pull timing.

Putting a thunderbolt V module on a IV system will cause the same thing.
I dont think my engine got a knock detector,i have a thunderbolt IV, can i use a thunderbolt V if the engine does not have the knock sensor?
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Old 07-13-2010, 03:25 PM
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Originally Posted by markku4444
I dont think my engine got a knock detector,i have a thunderbolt IV, can i use a thunderbolt V if the engine does not have the knock sensor?
No, they are not interchangeable, the V will retard all the time w/o the knock module present.
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Old 07-13-2010, 04:08 PM
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Originally Posted by apollard
No, they are not interchangeable, the V will retard all the time w/o the knock module present.
Ok thanks i will try a complete MSD system and hope that will work
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Old 07-14-2010, 08:34 AM
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put a HEI in it, run no vacume advance, set your total timing, simple works great...
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