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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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<blockquote data-quote="V8!" data-source="post: 227106" data-attributes="member: 5822"><p>I was using Shell 91 and it was fine. I had a family member take it out, fill it up and bring it back, it dieseled after she brought it back, swore she put the 91 from Shell in. When I interrogated her more, she admitted to putting 87 and she thought the octane thing was just a myth. "gas is gas" well its not.</p><p></p><p>Anyway I used 91 from Shell and it was fine.</p><p></p><p>If your car is pre catalytic convertor you can use water, transmission fluid, or seafoam to try to clear it out. I would not use anything in the tank as that seems to dilute it too much. You can try but who knows how well it will work. If you are pouring it through the carb, do it slow and keep it about 2500-3500 RPM. When you add it you will slow the engine down, STOP POURING wait for the bit you poured in to clear and repeat. DO NOT DO IF YOU DON'T FEEL COMFORTABLE. Most likely you have a little excess carbon on your intake valve, piston, or cylinder head and it's raising the compression a bit, or its glowing and igniting the fuel after you turn the car off. </p><p></p><p>After its cleaned you can always put a catch can on, and it will help prevent carbon build up, as it removes the oil vapour from the fuel that enters your cylinder. There are a million opinions on catch cans and some people swear by them, others think they are a product of the devil, but they do (if you get a good one) remove oil from the air/fuel charge entering your cylinder so take it for what it's worth.</p></blockquote><p></p>
[QUOTE="V8!, post: 227106, member: 5822"] I was using Shell 91 and it was fine. I had a family member take it out, fill it up and bring it back, it dieseled after she brought it back, swore she put the 91 from Shell in. When I interrogated her more, she admitted to putting 87 and she thought the octane thing was just a myth. "gas is gas" well its not. Anyway I used 91 from Shell and it was fine. If your car is pre catalytic convertor you can use water, transmission fluid, or seafoam to try to clear it out. I would not use anything in the tank as that seems to dilute it too much. You can try but who knows how well it will work. If you are pouring it through the carb, do it slow and keep it about 2500-3500 RPM. When you add it you will slow the engine down, STOP POURING wait for the bit you poured in to clear and repeat. DO NOT DO IF YOU DON'T FEEL COMFORTABLE. Most likely you have a little excess carbon on your intake valve, piston, or cylinder head and it's raising the compression a bit, or its glowing and igniting the fuel after you turn the car off. After its cleaned you can always put a catch can on, and it will help prevent carbon build up, as it removes the oil vapour from the fuel that enters your cylinder. There are a million opinions on catch cans and some people swear by them, others think they are a product of the devil, but they do (if you get a good one) remove oil from the air/fuel charge entering your cylinder so take it for what it's worth. [/QUOTE]
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Corvette
C3 Forum
1970 C3 LS5 ... Question about fuel
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