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Having bought and restored (still in progress) a classic 82 T, my first turbocharged car, I've had to come to terms with the concept of excess heat because of the compression factor, plus the use of the exhaust system as the source of intake compression boosting. It didn't take me long to realize an intercooler was essential to the optimum performance that my car was capable of. Then I had to come to terms with how a fuel injection system works - that during every moment of the combustion cycle, fuel is continuously sprayed into each of the four intake ports, and that a good bit of that fuel is used as a coolant on the hot metal surfaces that it comes into contact with, most important being the intake valves. No doubt some fuel is sizzled into nothing like spit on a woodstove before it can become effective as a propellant. Because of the importance of this vital internal cooling, running too lean is therefore dangerous. Higher octane fuel is important because of it's delayed combustion during increased temperature settings. I'm guessing this also applies to the fuel which comes in direct contact with the sizzling hot valves. Yes?
Q#1 Does using a higher octane fuel provide better gas milage? The reasoning being - less fuel is sizzled into nothingness before it can be ignited as a propellant.
Enter water injection systems to help provide additional cooling.
Q #2: Does water injection provide better gas milage? The reasoning being - the water is used as coolant in tandem with the fuel, leaving more fuel to be used as propellant instead of sizzling into uselessness.
Keeping in mind that I haven't kept up with fuel system innovations, I ask: Have there been advances in fuel injection engine systems where the f.i. valves pulse on and off at the appropriate moment instead of spraying constantly? At the same time, an advance in temperature reducing technology would also be necessary. Perhaps a secondary injection nozzle which sprays water during the moments when fuel is not sprayed. Or a single injection valve which sprays both fuel and water in a constant controlled pulsing fashion. This would obviously be far more fuel efficient.
Feel free to add to this topic and thanks in advance for correcting and or enlightening me.
, Tue, 31 Jul 2001 20:01:05
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