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| Joined: | 03-12-2005 |
| Location: | Cary, North Carolina USA |
| Posts: | 339 |
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John,
I don't think your specific new problem is in the carbs. When I rebuilt Ron Earp's engine last year we found a similar timing problem. It turned out that when the distributor was tested it was firing all over the place.
MSD is known for their "Multiple-Spark-Discharge". Translation: A single spark doesn't fire at a 10^BTDC, rather the first one fires at 10^ then several more over something like the next 30^ of rotation.
Judson is right on here. I had my dizzy rebuilt by a fellow who does MG dizzys and the spark scatter went away. My timing would jump around a fair amount that of course got worse as the RPMS increased.
After rebuild you could hold it at 6k and put the light on it and get a steady, rock steady, timing mark. That wasn't the case before the rebuild by any stretch. This is with an MSD on the system.
The MSD is fine to use, but your dizzy has to be in good shape as well as the dizzy cap and rotor.
Ron