Fuel Temperature Compensation
Fuel Temperature Compensation
(OP)
Hi All,
Can anyone guide me with the theory of the effects of fuel line temperature relative to fuel delivery of a/f?
Basically does the a/f richen or weaken as the fuel tempature increases?
Hope you can help
Can anyone guide me with the theory of the effects of fuel line temperature relative to fuel delivery of a/f?
Basically does the a/f richen or weaken as the fuel tempature increases?
Hope you can help





RE: Fuel Temperature Compensation
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RE: Fuel Temperature Compensation
Mike
RE: Fuel Temperature Compensation
Air to fuel ratio is the ratio of the mass of air to the mass of fuel.
For a chemical reaction to be in balance, the mass of each reagent must be correct.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Fuel Temperature Compensation
Air/fuel ratio is measured in pounds, isn't it? State (liquid / vapor) has nothing to do with it. -whitevette
RE: Fuel Temperature Compensation
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Fuel Temperature Compensation
If it is a carburetter engine, it is a must that the air and the fuel are hot enough. Otherwise the fuel will form droplets again. In cold area's, it can be good to preheat the fuel.
If it is an injector engine. The temperature of the fuel is important for the atomizing. If the viscosity of the fuel is to high, the fuel pump will have troubles with it, and after the injection, the average size of the droplets will increase. This will cause a greater delay on the ignition, resulting in loss of power, loss of efficiency and higher exhaust gas temperatures. In worst cases, it will cause a diesel knock that, if ignored for long time, can damage the crankpin bearings.
At sea, they use the lowest quality fuel, and we preheat it to over 130 °C before it reaches the fuel pumps.
RE: Fuel Temperature Compensation
Yes, but I assume from the "At sea..." bit that these will be heavy-oil engines where the fuel in question is more like light tar than automotive diesel.
Musn't confuse the functional niceties of gasoline, diesel and marine heavy oil types.
Bill