Cooler fuel
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Senior User
Joined: Oct 2006
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From: The Casa
Cooler fuel
You know how the fuel line runs close to the headers before entering the fuel pump,would rerouting the fuel line get the fuel cooler.I just thought that someone has done it already.Would cooling fuel make more power,or I am just spinning my wheels trying to make more power.
Thanks
1977 f150 351m 4x4
Thanks
1977 f150 351m 4x4
Post Fiend
Joined: Jul 2006
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Originally Posted by czaroc
cooling the fuel will have the opposite affect to what you are looking for. colder fuel does not atomize as well.
cooling the air, however, is quite desireable.
cooling the air, however, is quite desireable.
Atomization and combustion are two entirely differnt things. Hot fuel combusts at a shorter rate, but is unstable, and does not make the power that it cold because it occupies too much space, so less fuel will fit in a given space.
Cold fuel is more dense and occupies less space, thus allowing a greater amount of fuel to be introduced to the cylinder and will make more power. The same principle applies to the "cold air charge".
Cold fuel makes more power. Aftermarket companies spend a great deal of time and effort to make "Cool Cans" designed to cool the fuel before it gets to the cylinders.
Will it make a big difference? No. In a drag vehicle, this is probably only worth a few thousandths. Sometimes it is the diff. between a win light, but for a driver, may not be noticeable.
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Yes. cold fuel systems can make more power. BUT you still must maintain the correct air/fuel mixture. so typically these "cool can" systems require forced induction.
he didn't ask about power, he asked about mpg.
warm fuel does burn more efficiently. BUT in the absence of a pressurized fuel system and EFI, it's hard to implement.
You would vapor-lock your carb far too easily to be worth the hassle; the enthalpy of vaporization is fairly low.
he didn't ask about power, he asked about mpg.
warm fuel does burn more efficiently. BUT in the absence of a pressurized fuel system and EFI, it's hard to implement.
You would vapor-lock your carb far too easily to be worth the hassle; the enthalpy of vaporization is fairly low.
Last edited by czaroc; Jul 21, 2007 at 12:23 AM.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
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From: Hesperia, CA
Check with some of the MPG sites and they quote heating fuel to increase mileage. I think getting the fuel preheated before the fuel pump is a sure way to get vapor lock. If it was me I would try to get those lines away from those headers. If you want to preheat the fuel to get better mileage I would do it after the fuel pump.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
If you have a carburated engine, you might get a slight increase in power by having cooler fuel, but not better milage. (Ever notice that your engine runs better on a cool damp night?)
With EFI, probably no gain. The system will adjust itself according to the mixture.
With EFI, probably no gain. The system will adjust itself according to the mixture.
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Post Fiend
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[QUOTE=czaroc]Yes. cold fuel systems can make more power. BUT you still must maintain the correct air/fuel mixture. so typically these "cool can" systems require forced induction.
"he didn't ask about power, he asked about mpg."
The OP very much asked about power!
The part where the OP asked about whether or not the cooler fuel made more power was exactly what I answered. The OP did not ask about mileage. Never was A/F ratio discused, that is a given, and forced induction vs natural aspiration has very little affect on fuel temps in relationship to density, and power.
If fuell temps were a factor for mileage, why do we not run heaters in our fuel systems? One would think that if this were true the aftermarket would be full of fuel heaters. Can't say I have ever seen one.
"he didn't ask about power, he asked about mpg."
The OP very much asked about power!
The part where the OP asked about whether or not the cooler fuel made more power was exactly what I answered. The OP did not ask about mileage. Never was A/F ratio discused, that is a given, and forced induction vs natural aspiration has very little affect on fuel temps in relationship to density, and power.
If fuell temps were a factor for mileage, why do we not run heaters in our fuel systems? One would think that if this were true the aftermarket would be full of fuel heaters. Can't say I have ever seen one.
Last edited by 75F350; Jul 21, 2007 at 12:39 AM.
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Postmaster
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From: Sweetwater Texas
Originally Posted by Bdox
(Ever notice that your engine runs better on a cool damp night?)
With EFI, probably no gain. The system will adjust itself according to the mixture.
With EFI, probably no gain. The system will adjust itself according to the mixture.
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Originally Posted by Dean88
I know this is the 70's forum, but I can testify that cooler fuel will help an EFI (well my 87 anyway). I've noticed that I have much more power on cool misty mornings than compared to schorching hot days.
Some drag is asociated with this, but for the most part, this is a simple theory.
Also hot air makes less power. Airplanes suffer from less lift, and less power when ambient temps are high.
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From: Sweetwater Texas
Originally Posted by 75F350
That is barometric presure. Just like water injection, the moisture in the air will occupy space in the cylinder, and create more power by increasing compression.
Some drag is asociated with this, but for the most part, this is a simple theory.
Also hot air makes less power. Airplanes suffer from less lift, and less power when ambient temps are high.
Some drag is asociated with this, but for the most part, this is a simple theory.
Also hot air makes less power. Airplanes suffer from less lift, and less power when ambient temps are high.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
Originally Posted by Dean88
I know this is the 70's forum, but I can testify that cooler fuel will help an EFI (well my 87 anyway). I've noticed that I have much more power on cool misty mornings than compared to schorching hot days.
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