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Originally Posted by Allch Chcar
Aluminum alloy needs to be anodized or it will corrode.
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But corrode under what conditions? Al. even left in humid air won't corrode as long as the protective oxide coating remains intact. (Al. is not a good bearing material.)
In conditions where there is some other chemistry involved, such as contact with Ethanol or in an atmosphere that contains sea salt, then the simple Al. oxide coating that forms spontaneously is insufficient.
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The biggest issue is EFI programming and fuel compensation limitations. Early EFI used narrow band Lambda sensors, aka Oxygen sensors. Even some early OBDII compliant stuff didn't have the wide band Lambda Sensors. Newer CAN bus systems use wide band Lambda sensors than can compensate for Air to Fuel mixtures beyond Stoichiometric. This means the ECU can compensate for a wider range of engine conditions and operation. Plus non-FFVs often have a smaller window of adjustability for fueling.
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Even with narrow band sensors the fuel mixture compensation that is learned during closed loop operation will be extrapolated into open loop operation. If a high ethanol content fuel is used, the resulting lean mixture is compensated for in both closed and open loop operation.
Yes, there are limits set on how much correction is made before it is assumed there is a problem that shouldn't be learned around. If there is a CEL lit when on ethanol it is likely the allowed correction parameters have been exceeded.
If you can get away with operating only on ethanol, without having to use gas at all, using the higher flowing fuel injectors is the easiest way to avoid fuel mixture problems.
Higher fuel pressure will also increase the flow rate through the injectors but is more likely to run into the limitations of the fuel pump.
Fuel flow is proportional to the square root of the pressure difference across the injector. For 25% greater injector flow you'd need 1.56 X the original fuel pressure. The pump has to be capable of providing that extra pressure in addition to the (25%) extra flow rate. With higher flowing injectors, just the extra flow rate is required from the pump.