Old 11-09-2020, 08:43 PM
Join Date: Jul 2004
Location: White Bear lake, MN
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I doubt you'll ever get an answer. Too many variables peculiar to each setup to give a meaningful guide. Particular engine design, prop, fuel, cowl shape, entry, exit, smoothness of the airflow, ambient temperatures, humidity...the list is almost endless. Best you can do is be as empirical as you can be - give it as much as the practical configuration will allow. If it gets hot, modify for more, play with baffles, run richer, or whatever it takes. If you have a way to measure temps, so much the better.....
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daveopam (11-10-2020)