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Thread: Flex fuel sensor on 94 LT1 EE possible?

  1. #16
    Fuel Injected!
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    If I am incorrect of what steveo is talking about, please advise.

    Basically quench is the distance from the flat parts of the head to the piston. Let's say your engine is assembled with the piston .010" down from the deck(deck clearance). If you use a standard .038" thick gasket, you will have .048" quench. Most hot rod people try for .035" - .040" quench. The desired quench can be done with deck machining or gasket thickness.
    -Carl

  2. #17
    Fuel Injected!
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    Tom, The quench area is the tight area between the flat portion of the piston and the flat portion of the combustion chamber. Its purpose is to squeeze all of the mixture into the combustion area, so you want it as tight as possible without making contact. If you put a thicker head gasket in, then that area becomes less efficient, holds more mixture, and becomes more prone to detonation.

  3. #18
    Fuel Injected!
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    Jul 2019
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    Quote Originally Posted by Fastmax32168 View Post
    Steveo, Only running E85 would be my plan, however from everything I have researched the level of ethanol in E85 is not consistent, you can have 80% in one batch the gas station gets, and 65% in the next batch. No problem if you have a sensor that can read it and make the adjustment, but a problem if I need to tune it every time I get another tank of gas....or alcohol...or whatever.
    Where are you located? This is true in places with no regulation defining “E85.” In places like California that get their E85 from Pearson Fuels, however, your ethanol content is guaranteed to be between 83% and 85% ethanol. 2% isn’t going to matter and is well within the correction range for closed loop operation.

    Just putting that out there. While an ethanol content sensor and logic to support it would of course be the best, sourcing quality fuel and just using a static map will work too.
    1990 Corvette (Manual)
    1994 Corvette (Automatic)
    1995 Corvette (Manual)

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