Cooling fuel.........
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TECH Senior Member
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From: Estero, FL
Cooling fuel......... I have been kicking this one around on the ground for a while now. Do you think that there would be any performance gains by using an in line fuel cooler if any at all? And if there is no performance gain, what about better combustion? Just curious. thought about guinny pigging a system and seeing what it does
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From: Iowa :-/~
Re: Cooling fuel......... I know that was the idea behind the Thermo-Quad 4 barrel I was running on my 74 Dodge Charger. It held about a quart of gas in the reservoir and it was suppose to cool the gas down.
<img src="http://www.offroadexchange.com/images/crtrcarb.jpg" alt=" - " />
Thermo-Quad
Nice carb, boy could you hear it when it opend up!
<small>[ July 05, 2002, 03:57 PM: Message edited by: 2000 Camaro SS ]</small>
<img src="http://www.offroadexchange.com/images/crtrcarb.jpg" alt=" - " />
Thermo-Quad
Nice carb, boy could you hear it when it opend up!
<small>[ July 05, 2002, 03:57 PM: Message edited by: 2000 Camaro SS ]</small>
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From: Nawf Carolina
Re: Cooling fuel......... No, I dont think there would be any advantage. Why would you want cold fuel? Think about that? We're not using carbs, we dont have to worry about vapor lock. We're running high pressure fuel injection.
Hot fuel is going to mix better with the intake charge. I think you'd lose performance trying to cool it off personaly. But hey, no one will know till you try.
J.
Hot fuel is going to mix better with the intake charge. I think you'd lose performance trying to cool it off personaly. But hey, no one will know till you try.
J.
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From: Estero, FL
Re: Cooling fuel......... I thought of it this way....Colder fuel is denser fuel. And if the fuel is denser you might be able to deliver a bigger charge of it with each pulse. Maybe also help reduce detonation, kind of like an intercooler except for fuel. It was just a thought though. I might give it a shot if I can find one that will handle the pressures that our cars run.,
<small>[ July 05, 2002, 07:00 PM: Message edited by: NataSS Inc ]</small>
<small>[ July 05, 2002, 07:00 PM: Message edited by: NataSS Inc ]</small>
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From: Corona CA
Re: Cooling fuel......... It would be interesting...
The reason you run a fuel cooler is to increase the heat of vaporization of the gasoline. When fuel vaporizes, it cools the air with it down. The cooler the fuel is to begin with, the greater the effect. Air loses volume significantly when it's cooled. So you can get more fuel/air mixture into the cylinder, hence more HP.
BUT... Liquid fuel does not burn. Only vaporized fuel does. Cold fuel is harder to vaporize than warm fuel. Since our engines are port injected, I wonder if cold fuel will still vaporize completely.
Try it and report back. Dyno with the "cold-can" empty, then fill it with ice/salt/water, and re-dyno.
The reason you run a fuel cooler is to increase the heat of vaporization of the gasoline. When fuel vaporizes, it cools the air with it down. The cooler the fuel is to begin with, the greater the effect. Air loses volume significantly when it's cooled. So you can get more fuel/air mixture into the cylinder, hence more HP.
BUT... Liquid fuel does not burn. Only vaporized fuel does. Cold fuel is harder to vaporize than warm fuel. Since our engines are port injected, I wonder if cold fuel will still vaporize completely.
Try it and report back. Dyno with the "cold-can" empty, then fill it with ice/salt/water, and re-dyno.
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From: Estero, FL
Re: Cooling fuel......... I wont be running a "cold can" so to speak, but rather an in line "radiator" type. The reason is that I will be running the car in a 90 mile open road race. A "cold can" would melt after a few minutes into the race making it usless. But packing 160+ MPH winds through a type of radiator might help cool it down a bit.
I would think that the fuel injector itself would atomize the fuel enough to make it work. Or would the denser fuel make it harder for the injector to atomize?
I would think that the fuel injector itself would atomize the fuel enough to make it work. Or would the denser fuel make it harder for the injector to atomize?
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From: Nawf Carolina
Re: Cooling fuel......... I think it'd be harder on the injectors to atomize it. But, I'm sure size and spray pattern, possible psi would effect this as well. Only way to know will be to try it, and it would be hard to test a setup like you describe <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
J.
J.
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Re: Cooling fuel......... Cooling fuel does not increase the heat of
vaporization. That is a constant. You remove
the thermal energy difference, specific heat * delta t, is all. That's all the "negative
thermal energy" you can throw down the fuel
line.
Since you run something like 12:1 AFR, that's
mass ratio, the best you can do is to lower
the overall mixture temp by 1/13 the number
of degrees you lowered the fuel in the line.
If you drop the fuel 30degC you would expect
the AF mix to drop by maybe 2.5degC.
But the fuel doesn't run with the air, for the
most part; you shouldn't expect a full heat
exchange. The fuel will still be cold and the
air warm. Maybe having poorly atomized fuel
makes a slower burn and less knock. I don't
know as that means higher performance.
But every little bit helps, right. Sometimes,
a very little bit.
vaporization. That is a constant. You remove
the thermal energy difference, specific heat * delta t, is all. That's all the "negative
thermal energy" you can throw down the fuel
line.
Since you run something like 12:1 AFR, that's
mass ratio, the best you can do is to lower
the overall mixture temp by 1/13 the number
of degrees you lowered the fuel in the line.
If you drop the fuel 30degC you would expect
the AF mix to drop by maybe 2.5degC.
But the fuel doesn't run with the air, for the
most part; you shouldn't expect a full heat
exchange. The fuel will still be cold and the
air warm. Maybe having poorly atomized fuel
makes a slower burn and less knock. I don't
know as that means higher performance.
But every little bit helps, right. Sometimes,
a very little bit.
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