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Local folk lore has it around here that because of the altitude we should set our timing to around 10 degrees BTDC (factory is 7 degrees) on a F or 2F. To me, this doesn't really make a whole lot of sense, I would think that because there is less oxygen, you you tune it mildly retarded as it would take less time to combust the lesser amount of oxygen. A couple of weeks ago I retimed my '79 distributor (in my '75 2F) to 10 degrees and messed around with the vaccuum ports to get it as best I can with the distributor running the original smogged advance curve, but on a desmogged engine. It's one hose is plumbed directly to the carb port on the mail barrell. When warm it start and runs great, but on cold mornings until you are about 2 minutes into a drive it hesitates and misfires a little, as if it's too far advanced.
Any idea on timing for altitude? I'm still going to yank it for the HEI anyways (tomorrow most likely
), but I'd still be interested in what the jury says for timing it for altitude.
Also, anyone have any information on the OEM smogged versus desmogged advance curves? Is it really worth the time and energy to have it recurved? I hear the HEI's biggest advantage is that it combines a more accurate curve with hotter spark, so if I were to have the '79 dizzy recurved, should I set it to stock desmogged curves or something more similar to DUI's for example?
Any idea on timing for altitude? I'm still going to yank it for the HEI anyways (tomorrow most likely
Also, anyone have any information on the OEM smogged versus desmogged advance curves? Is it really worth the time and energy to have it recurved? I hear the HEI's biggest advantage is that it combines a more accurate curve with hotter spark, so if I were to have the '79 dizzy recurved, should I set it to stock desmogged curves or something more similar to DUI's for example?