Re: knock during hard acceleration
The reduction in needed spark advance with higher compression heads on a Model A is due to increase in the compression ratio in addition to increase in turbulence in the combustion chamber. This increases the rate that the air/fuel burns. This turbulence is a design feature of the flat head engine head. If you go to an overhead valve configuration, depending on the design, you may not get the turbulence and so you may need more advance than with a stock head.
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Last edited by nkaminar; 09-19-2023 at 07:56 AM.
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