Join Date: Sep 2000
Re: Ignition timing altitude compensation
The higher the altitude, the more advance the engine can tolerate. I believe I added 10 deg. when we raced at 7000 feet compared to our 1100 ft elevation.
My opinion, depends on your engine, carb metering, and gear, but for a "normal" carbed lower compression engine ... 15 deg initial, 15 vacuum, and 18 centrifical.
May be able to bump from there, listen to the engine and check the plugs for detonation.
The weather, and temperature will also influence ignition timing.
68 Dana 302, 68 rs 327 daily driver/family car, 71 rs, track car/ driver, 68 firebird 400, 70 formula 400, 73 type LT, 98 TA, 2 goofy kids and an incredible wife.