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K-Jet and octane rating... timing off? 200 1979

posted by  Aaron244DL on  Thu Oct 22 04:50 CST 2009
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last visit: Mon Feb 8 04:51 CST 2010
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Hello, I'm new to this forum and look forward to contributing what I can. I have a question about my car, a '79 244 with the B21F (K-Jet). It's got about 260,XXX miles on it.

Since I got the car a couple years ago, it's always seemed to prefer 93 octane gas. With 87 octane, it is a bit more sluggish, and, when under a load, makes a sound that can only be described as glass marbles rubbing against each other. I suspect there's something off with the timing. Could it be related to the distributor? Or maybe the camshaft is worn? Everyone else I know with a 240 runs regular 87 octane, as I think the normally aspirated engines were designed to run on it. Any thoughts?






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