Re: Compression ratio and octane rating

Posted by KEB on March 26, 2007 at 19:14:03 from (72.19.170.5):

In Reply to: Compression ratio and octane rating posted by hogman_2002 on March 26, 2007 at 10:32:44:

Also depends on whether its a carbureted or electronic fuel injected engine. Current electronic fuel injected engines have knock sensors, and will automatically retard the timing to whatever is necessary to avoid knock. As others have noted, for a carbureted engine there are a lot of variables. Does it have to meet emissions standards? EGR affects knock, as well as engine temperature and load, and the timing curve (there's probably other factors as well, but that's what comes to mind)

I can remember setting timing on older cars by advancing the timing until it would knock under load, then backing off just enough to avoid knocking.

Keith

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