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- From: borowski@hpspkla.spk.hp.com (Don T. Borowski)
- Date: Fri, 24 Jul 1992 16:05:06 GMT
- Subject: Re: Altitude effects on ignition timing
- Message-ID: <31160113@hpspkla.spk.hp.com>
- Organization: Hewlett Packard Company, Spokane, Wa.
- Path: sparky!uunet!sun-barr!cs.utexas.edu!sdd.hp.com!hp-cv!hp-pcd!hpspkla!borowski
- Newsgroups: rec.autos.tech
- References: <1992Jul23.192955.2179@unislc.uucp>
- Lines: 21
-
- In rec.autos.tech, wcr@unislc.uucp (William Rankin) writes:
-
- >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.
-
- As I recall, the rule of thumb is 1 degree of added advance per 1000 feet
- of altitude. But since the car in question already has high-altitude
- emissions, this is probably already factored in.
-
-
- Donald Borowski WA6OMI Hewlett-Packard, Spokane Division
- "Angels are able to fly because they take themselves so lightly."
- -G.K. Chesterton
-
-