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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!unislc!wcr
- From: wcr@unislc.uucp (William Rankin)
- Subject: Altitude effects on ignition timing
- Message-ID: <1992Jul23.192955.2179@unislc.uucp>
- Organization: Unisys Corporation SLC
- Date: Thu, 23 Jul 1992 19:29:55 GMT
- Lines: 9
-
- I seem to recall that on non-computer controlled (mid 70s) cars that
- the ignition timing should be adjusted for altitude. Anybody able to
- verify this and if so, what is the adjustment ( degrees + or - per 1000')
- The GM factory shop manuals don't say anything about altitude adjustments.
- Just so I dont misunderstand, advance is more deg before TDC and retard
- is less deg before TDC, true? The factory setting is 20 deg BTDC.
- Since this car is already equipped with high-altitude emissions, perhaps
- they already factored in an altitude advance into this number.
- Any comments welcome.
-