fuel coolers ?????

There's

this weird looking length of plastic under the car covering the fuel return and feed lines, its got these vents cut into it that face forward, and surprise surprise this directs air onto those lines.

 

i can't see this one working , i dunno why . it seems a little out there ..... this is a very good topic , as i've been through this a few times .. i think the way UAS has it is ok but i would also put another in the front away from the engine. by the time the fuel gets to the engine from the back it will get hot again .. also we need to slow the fuel down , this is something i've been telling people for some time now , ( years ) the fuel goes round and round , and heats up while doing so and loses its octane level . ( fact ) back in the day we would restrict the fuel and slow it down, this way we see fuel temp drop by a little, and the problem is that i dont remember what we came up with the octane level .. one cooler at the back , where the diff is and one cooler in the engine bay , where the battery goes , in that spot there is a nice hole on the car frame , this will give it nice air , but i will make a box for this system to cover it in the front and put an escape hole somewhere. this most likely be in my new set up .. nice and clean, plus one trick that i have up my sleeve to cool it down even more ...

i have a question about the fuel pump set up .. on the stock pump set up there is a little thing on the return side of the fuel pump housing , there is an earth wire going to it and another wire im not sure what this is , it does get hot though >> help ? it a little small dicky thing at the bottom of the return pipe
it seems its there to heat up the fuel ..


off to work . keep on this topic and lets see if we can come up with something ..

cheers guys ..

 

No hand waiving nor big words used at all Brisz.

Do you understand how water injection works? we are talking the same theory, reduce the charge air temp = more air in the cylinder, more fuel can go in, more spark advance = more power.

It's a no brainer but go ahead try to tell me I am wrong because you don't like what I have said here and in the past, I couldn't give a toss, those that know the subject or do the research and can understand it will laugh at you not I.

The OP asked if they work essentially NOT if you think it is worth while fitting to a street car or track car etc, if you don't like the idea don't read the thread, don't post in it & don't tell those who know what they are talking about that they are talking stupid shit.

 

That's the low fuel level sensor no doubt.

I'm a fan of controlling the speed of the pump rather than relying on the fuel pressure regulator to do all the work. Nissan went to all the trouble of fitting fuel pump controllers, It's not hard at all to set up the pumps to run at appropriate speeds in relation to loads etc.

 

From what i recall from the thread i saw it used in. The idea was that the surface area of the lengthy piece of finned pipe under the chassis was the same or more than what conventional cooler had to offer. Space was a constraint at the time. And a product like this, which i recall was seen on a diesel application, could allow him to run a cooler of some sorts. But after testing he found that some fins were getting damaged, as they were very very thin.

Ill have to try and find the thread again. Was some years ago that i read it.

However as you mentioned the speed at which the fuel is passing through the pipe will cause a negative affect of the efficiency of the phase change process. Slowing the fuel transfer rate would indeed increase cooling efficiency. I guess putting header tanks and or front and rear coolers would aid in this process. Conventional grid coolers with an appropriate flow of cooling air passing through it will have the same effect. Maybe better, who knows. Can only really guesstimate the figures, but with different installations better hard data could be had.

Can also take it as far as saying/asking; what material is better then the other, and at what thickness, number of rows, number of fins, and what air cfm is best for cooling.

Even removing a few degrees would be better then nothing at all. As we're not talking extremes. After all the fuel and air temps have to be within a certain range for the engine to run at its best. Too cold and it will start to take a negative effect on the system.

 

Why the return line?

In my eyes (not that I know hard facts), wouldnt a return line cooler be negated? By the time the "cooled" fuel from the return made it's way to being used again, wouldn't the temperature be close enough to normal?

Why not have it on the incoming side? Pressure related issues or something I'm not seeing?

 

Are you thinking an air cooler cools below normal ambient temps (outside temp)
purpose is to keep from getting too hot and as close to "normal" temps as possible ..
ice cooling is a different story ..that makes it cooler than ambient.

Return line because it will be hottest coming back from the engine bay and cooling before going to Surge and main tank.. just my preference and prefer lower pressure side.

advantage I also have is all aluminium hard lines

 

No I understand it "cools" it to ambient or as close to, but even so, I would rather be using the "cooled" fuel in my incoming rather then just putting the "cooled" fuel back on the tank to heat up again...

And aluminium hard lines will act as a heat sink of sorts right? Like they would cool more than the stock lines would in the same situation..?

 

should dissipate heat better considering they are exposed to air under the length of the car .. could be wrong

 

OK go fit your air brakes. :rofl:

 

The way I see it, how fast an Air Cooler can cool, is not linear, the closer to ambient air temp, the slower/longer it takes to level off with ambient temp. Where as coming from a significantly higher temp, being met with such a low temp, it would drop faster, and drop more.

Say the Fuel comes back at 70c, and goes in at 50c, Ambient Air is 20c... in the few seconds it will be in the cooler, you could perhaps shave off more temp by trying to cool the hotter line. Say you remove 30-35c from the 70c return. Wouldn't that be better then removing 15-20c from the 50c going in?

Then theres the other effect, that regardless of which side you put it on, its still going to lower the overall temp on both return and feed. It's a tricky one.

Seems logical, unless someone would like to point out where I'm wrong?

MoulaZX

 

I had a fuel cooler in my yellow Z in the return line back to the tank.
Since I had a FMIC, I placed a trans cooler where the drivers side SMIC was and placed a similar trans cooler in the passenger side SMIC location as a fuel cooler.

I never did before and after dyno runs, but the concept seemed a good idea, as the fuel can get up to around 65 degrees on a hot day once it passes through the fuel rails on long trips.

It did take around 10 degrees off the temperature of the fuel, and mine was just passively cooled (no fan).

Also the fuel will heat up more quickly when there is less fuel in the tank.

 

How about a fuel warmer for toluene : )

 

How much drag do you propose a fuel cooling system will add to the car?
How much extra power do you see potential for?
If the total extra power is enough to overcome any extra drag then I would suggest it will be those who choose to use this sort of thing laughing at you.

Keeping fuel at the right temp for the application is a well known advantage, from cooling systems for nitrous oxide bottles to fuel warmers for aircraft jet engines.
Keeping the fuel as close to optimal temp is far better for performance than acting like a child on an internet forum disagreeing with people just because you don't understand the subject.

 

thought the same...... but it seems to be making a bit of a comeback



even the 4.5l V8 Toyota Landcruisers are using one to cool the diesel on the return line side......



link:
http://www.ebay.com.au/itm/Fuel-Coo...=AU_Car_Parts_Accessories&hash=item45fe190885



the more I read the more I see claims that for every 10 degrees C reduction if fuel temp there is a 0.5% increase in HP (averaged out a tad because some were a bit out there )





With todays modern fuel systems, the fuel is obviously much higher in its temps than in our day when you could actually sit in the enginebay to work on the beastie that lurked within.....

The reason I asked originally is because I'm seeing a few other forums that are performance related heading down the same path..... does this old trick work on todays more modern injected systems, and it seems to be an advantage in most cases even to the point that the diesel guys are now doing it......


Kingy

 

from a mob that does supercharged engines.......

 

just add ice


http://www.ebay.com.au/itm/Moroso-6...r_Truck_Parts_Accessories&hash=item5d32a5b557

 

well aware of this..... and they must have some effect even tho the lines are covered in 20years of road crud, and the plastic covers are slightly less than 2nd hand..... if they are in fact still there
:rofl:

What I'm chasing is a system that cools the fuel on the return side of things to drop the temp of the fuel back to ambient temperatures

 

see a few of the V8 boys running these at the drag meets I've been to of late, again, problem is they are a short term cooler, I want a cooler that cools whenever the engine is running.....