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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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<blockquote data-quote="V8!" data-source="post: 226583" data-attributes="member: 5822"><p>I use to own a C3 and loved the thing, it had a 454 which had a few modifications to it. It would constantly diesel, unless it had high octane fuel in it, then the dieseling would stop. Because the build was fresh and it was properly tuned I knew carbon and timing were not an issue. It was the high compression built into the engine causing low octane fuel to ignite after the ignition was turned off.</p><p></p><p>In your case if your engine has lots of miles on it, it could be due to carbon build up, which can raise the compression ratio. You can check your timing as well to see where it's at as it's not hard to do. Best gas to buy before the winter is "Ethanol Free" and the only one (that I know of) that sells "Ethanol Free" here in Ontario is Shell and its only the premium V power 91. It is written right on the pump. </p><p></p><p>Dieseling is caused by fuel igniting, so when your ignition is turned off, its not the spark plugs. The only other things left are the fuel that it drawn in when the engine continues to turn over, and what's in the cylinder (steel wall, piston head, valves, and cylinder head)</p></blockquote><p></p>
[QUOTE="V8!, post: 226583, member: 5822"] I use to own a C3 and loved the thing, it had a 454 which had a few modifications to it. It would constantly diesel, unless it had high octane fuel in it, then the dieseling would stop. Because the build was fresh and it was properly tuned I knew carbon and timing were not an issue. It was the high compression built into the engine causing low octane fuel to ignite after the ignition was turned off. In your case if your engine has lots of miles on it, it could be due to carbon build up, which can raise the compression ratio. You can check your timing as well to see where it's at as it's not hard to do. Best gas to buy before the winter is "Ethanol Free" and the only one (that I know of) that sells "Ethanol Free" here in Ontario is Shell and its only the premium V power 91. It is written right on the pump. Dieseling is caused by fuel igniting, so when your ignition is turned off, its not the spark plugs. The only other things left are the fuel that it drawn in when the engine continues to turn over, and what's in the cylinder (steel wall, piston head, valves, and cylinder head) [/QUOTE]
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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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