Re: 37 Packard V12 2/4

Posted by TxGoat On 2024/6/28 7:28:34

Late timing would allow the plugs to run hotter than normal, which might give them the appearance of plugs that had run lean.
Normally, over-advanced timing will lead to pinging under load, but late timing can lead to higher combustion chamber temperatures, and overheated exhaust valves and spark plug tips can cause pre-ignition pinging under load. Late timing can also cause carbon deposits to become very hot and cause pre-ignition.