Dec
15
i read that they run on two fuels at once in one chamber, and can burn on any certain amount of fuel
but how does this helping compared to regular vehicles?
also i didnt understand a paragraph i read online:
Both methanol and ethanol burn at lower temperatures than gasoline, and both are less volatile, making engine starting in cold weather more difficult. Using methanol as a fuel in spark ignition engines can offer an increased thermal efficiency and increased power output (as compared to gasoline) due to its high octane rating (114[1]) and high heat of vaporisation. However, its low energy content of 19.7 MJ/kg and stoichiometric air fuel ratio of 6.42:1 mean that fuel consumption (on volume or mass basis) will be higher than hydrocarbon fuels. The extra water produced also makes the charge rather wet (similar to hydrogen/oxygen combustion engines)and combined with the formation of acidic products during combustion, the wearing of valves, valveseats and cylinder might be higher than with hydrocarbon burning. Certain additives may be added to motor oil in order to neutralize these acids.
JESSIE
Comments
3 Responses to “question about flex-fuel vehicles?”
Leave a Reply
You must be logged in to post a comment.
TONY
ok first the way a flex fuel vehicle works is it uses a sensor in the fuel line that tells the computer how much alcohol is in the fuel, and the computer makes the needed adjustment to allow the engine to properly burn the fuel.
as stated alcohol burns colder than gasoline does, and as such it is harder to ignite alcohol when the engine is cold, and alcohol does require more fuel to get a proper fuel mixture. stoichiometric fuel mixture only means that the fuel mixture is correct to get minimum emissions output with maximum efficiency.
by the way flex fuel engines can handle any gasoline based fuel from straight gasoline to E85, or up to 85% alcohol. they wont handle straight alcohol.
PAT
lets break this down, first, ethanol and methanol are more volatile than gasoline. Maybe in 1960 gasoline was more volatile, but federal laws dictates volatility on gasoline.
Ethanol and methanol can have higher thermal, but so can gasoline. There is not 1 engine built for consumers that use ethanol’s higher octane to get better mileage. got it, not 1.
Ethanol and methanol will burn hotter and burn up valves and seats.
SETH
its not helping the consumer, they cost more to manufacture, so the will cost a lot more to buy, the fuel is more destructive so they will cost more to fix, the fuelcosts more to produce, it will cost more to operate, it takes hydrocarbon fuels to produce methanol and ethanol. its all part of the scam!!!