Ignition timing altitude compensation - Team Camaro Tech
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post #1 of 2 (permalink) Old Dec 18th, 08, 03:21 PM Thread Starter
Tech Team
Join Date: May 2007
Location: Colorado
Posts: 38
Ignition timing altitude compensation

How much do I need to do to adjust for altitude when setting my timing? (I am at 5400 ft)

What distributor bushings would be recommended 18, 21, 25, 28?

Would I also want to put on heavy springs on the curve kit to slow the advance rate?

jjbaldw is offline  
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post #2 of 2 (permalink) Old Dec 18th, 08, 04:07 PM
Senior Tech
Join Date: Sep 2000
Location: Glendale,AZ.U.S.A.
Posts: 974
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.
dale68z is offline  
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