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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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<blockquote data-quote="charliebates" data-source="post: 227186" data-attributes="member: 2483"><p>“FOOD FOR THOUGHT “</p><p> Premium grade fuel burns slower than regular grade fuel. </p><p>That’s why a high compression engine of 10.5:1 compression pings using regular gas. The combustion takes place too soon and can damage the engine because the piston, connecting rod and crankshaft are all in one line and the energy is absorbed into these parts instead of turning the crankshaft. </p><p>In low compression engines like 8.3:1 compression ratio premium fuel will not burn fast enough and results in unburnt fuel contamination of carbon build up on the heads, pistons and valves. This can also cause sticking valves resulting in backfire and carb cough. </p><p>The only way to fix sticking valves is to tear down and ream the valves guides clean. </p><p>A worn out high compression engine can lose compression in all or just one cylinder. </p><p> That reduced compression will cause carbon build and dieseling/glow plug results when burning the premium fuel.</p><p> I expect that’s why some install hotter spark plugs as compensation for carbon build up in bad cylinders low on compression. </p><p>Marvel Mystery Oil and Seafoam fuel additives both will help to clear out carbon build up and have a cleaner burn. </p><p> But these fuel additives will not free up sticking valves.</p></blockquote><p></p>
[QUOTE="charliebates, post: 227186, member: 2483"] “FOOD FOR THOUGHT “ Premium grade fuel burns slower than regular grade fuel. That’s why a high compression engine of 10.5:1 compression pings using regular gas. The combustion takes place too soon and can damage the engine because the piston, connecting rod and crankshaft are all in one line and the energy is absorbed into these parts instead of turning the crankshaft. In low compression engines like 8.3:1 compression ratio premium fuel will not burn fast enough and results in unburnt fuel contamination of carbon build up on the heads, pistons and valves. This can also cause sticking valves resulting in backfire and carb cough. The only way to fix sticking valves is to tear down and ream the valves guides clean. A worn out high compression engine can lose compression in all or just one cylinder. That reduced compression will cause carbon build and dieseling/glow plug results when burning the premium fuel. I expect that’s why some install hotter spark plugs as compensation for carbon build up in bad cylinders low on compression. Marvel Mystery Oil and Seafoam fuel additives both will help to clear out carbon build up and have a cleaner burn. But these fuel additives will not free up sticking valves. [/QUOTE]
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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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