fuel

[perfworks]

i acme across some board of engineers on the net and wanted to get some opinions from some of you tech guys out there ( or anyone sorry ) about what they thought of this topic
FUEL VAPORIZATION for better atomization in the A/F mixture
they are saying that warming the gasoline before it reaches the injector will provide a better mixture and better combustion, lowering internal temps. better emisions, less fuel consumption and better performance

 

[alec172]

I'm not too sure about lowering internal temperatures. A sub-part of fuel is to cool the head. Not that much of an effect in cars but in a small airplane, we can control the engine temperature with fuel.

I guess atomization will only regulate your A/F ratio throughout the cylinder. I can see lower cunsumation for a regular engine. With a turbo, maybe some noticeable gains.

I think.

 

[perfworks]

they are saying that the heated fuel would atomize creating the ideal ratio thus making complete combustion possible wich in turn creates lower temps than a lean condition would.
they also make a good point about A/F ratio
there theory is that stoich. ratio is the only way to go but a 13-1 is safe and not to rich
anything else is a waste of fuel and added emisions

 

[spoolinmp3]

I am no scientist but I know of some drag racers that actually do the opposite and cool down the fuel by running the lines threw boxes of dry ice.

 

[igdrasil]

All I know is:

Cant remember exactly, i think stoich for gasoline is 14:1, something around there.

Everything feeding the engine, colder is better.

Warming the fuel before it reaches the injector will eventually NOT make the chamber cooler than a colder injection of fuel.

Hot chambers can detonate the fuel spontaneously if the temperature go high enough, in other words; the fuel may not ignite at the right time
....worse than tha: If it detonates way before the piston starts the combustion stroke. (Compressing the air as in the compression stroke, will raise the air temp)

 

[perfworks]

stioch. is 14.7 :1 AT SEA LEVEL
a cold intake air charge increases air density and keeps temps low
high cylinder pressures keep temps high
what i believe they are saying is that :
the proper 14:1 or 13:1 (forced induction engine) ratio with the right atomization characteristics, and a raise in the fuel temp will allow fuel to vaporize more efficiently when added to the intake chrge .
this will cause a "complete" burn of the A/F mixture.
the lower temps they were discussing i think was in contrast to a lean condition.
there have been tests they say that a colder fuel being dispersed in the port DOES NOT mist and mix well , it creates tiny droplets that dont vaporize and get sent out the tailpipe as unused fuel.
i think they might have a good point when they say to try and increase fuel pressures and temps (slightly) to get optimum performance (only on the fuel side)