Single Turbo RX-7's Questions about all aspects of single turbo setups.

fuel coolers

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Old 01-08-03, 08:51 AM
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fuel coolers

anyone use one?
i am thinking about it... one like one of these. http://store.summitracing.com/defaul...rchType%3DBoth

or something like this. http://www.designengineering.com/cry..._fuel_bar.html

the reason being is that i feel that my set up is far from the *best* way to have the return routed (did it this way to get it done and over with quickly) but even after i have the return dump into the top of the tank, it is still going to be sent to the botom of the tank and heating up the fuel. i dont see what it would hurt by trying, but just wanted to ask the opinions of others about this topic. here is how i have the return set up right now. (its the one on the left)
Old 01-08-03, 10:25 AM
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is that how your sump looks from behind the car ? anyone who comes behind you is not gonna wanna mess with you LOL
Old 01-08-03, 10:46 AM
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i dont care about anyone else or what they want to do.
Old 01-08-03, 10:48 AM
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Re: fuel coolers

Originally posted by rxrotary2_7
(its the one on the left)
ooops... today must be backwards day. it is the one on the right. (the other left. ) not that is matters. point is how close they are together.
Old 01-08-03, 11:13 AM
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rxrotary2_7 - is that AN8 feed and AN6 return?
Old 01-08-03, 11:54 AM
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be careful going in and out of driveways.....

mike
Old 01-08-03, 01:07 PM
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i know... my drivway is flat. no incline.

nocab, they are -10 and -8
Old 01-08-03, 01:26 PM
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Originally posted by rxrotary2_7
i know... my drivway is flat. no incline.

nocab, they are -10 and -8


You must have very clean fuel, flowing that much through your filter and back. LOL

k
Old 01-08-03, 02:22 PM
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i don't think you need a fuel cooler
Old 01-08-03, 02:47 PM
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nocab, there are actualy 2 aeromotive filters inline. one 100micron, and one 10micron. no more stock BS.
Old 01-08-03, 02:55 PM
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Originally posted by vosko
i don't think you need a fuel cooler
care to share any logic behind this comment?
Old 01-08-03, 04:31 PM
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Originally posted by rxrotary2_7
care to share any logic behind this comment?
if my logic is correct. moving a fluid a long distance at high speed should cool down the fluid enough. i think they mainly use those fuel coolers for race cars that the fuel cell is 2 inches away from the hot engine

i may be entirely wrong but i'll double check
Old 01-08-03, 07:37 PM
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For carbed engines, increases fuel density (same way intercooler works for intake air) and allows more fuel through the same jet or something like that.
Old 01-08-03, 07:44 PM
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I wouldn't bother dude.

Unless your making some serious power, and cooling the fuel is required in order to prevent pinging or something, it's probably a waste of money and space.
Old 01-08-03, 08:18 PM
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i figured as much, but just thought i would ask because i have not seen any talk of it. the reason i *thought* it may be a good idea is because there is a fuel temp sensor, but was not sure what was actualy compensated when the temps rise. can anyone enlighten me?
thanks to everyone who replied.
Old 01-08-03, 08:53 PM
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Originally posted by vosko
if my logic is correct. moving a fluid a long distance at high speed should cool down the fluid enough.
If my logic is correct, your logic would be incorrect.
I believe moving a fluid a long distance adds heat to the liquid, thus increasing its temperature. The heat would come from friction.

There is no reason why the liquid should lose energy when being moved.
Old 01-08-03, 09:04 PM
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Originally posted by Mr. Stock


If my logic is correct, your logic would be incorrect.
I believe moving a fluid a long distance adds heat to the liquid, thus increasing its temperature. The heat would come from friction.

There is no reason why the liquid should lose energy when being moved.
i assume it would dissipate heat. same principle as the rows in a radiator...
Old 01-08-03, 09:34 PM
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Originally posted by Mr. Stock


If my logic is correct, your logic would be incorrect.
lol, thats the finniest thing I herd all day but you are both right right in some respects. The large diameter lines may cool the fuel down some durring it's journeys because of the lower velocity but it depends on the heating source for the over all temp of the fuel. To make this easy why dont you just take a temp reading of the fuel after a long drive and take it from there? If it does seem to get warm I'd just put the pick up and the return on the opposite ends of the tank. The tank is also a fuel cooler, it has thin walls and a lot of air flow passing buy it. But to be honest I don't think your fuel would get hot unless your fuel pump is pumping 10gpm across the regulator next to your exhaust then back to the tank.
Old 01-08-03, 11:55 PM
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Originally posted by rxrotary2_7
i figured as much, but just thought i would ask because i have not seen any talk of it. the reason i *thought* it may be a good idea is because there is a fuel temp sensor, but was not sure what was actualy compensated when the temps rise. can anyone enlighten me?
thanks to everyone who replied.
the fuel temp sensor is for hot starts

mike
Old 01-09-03, 07:37 AM
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Originally posted by setzep


The tank is also a fuel cooler, it has thin walls and a lot of air flow passing buy it.
that is what i figured, but the reason i questioned the functionality of the tank now was because of how close the two (delivery and return) ended up. they are only about 2-3 inches from eachother.
i am going to change it latter to have an AN fitting mounted to the top plate of the tank and run a tube that would be welded onto the AN fitting to the other end of the tank...or atleast further forward than it is now.
Old 01-09-03, 01:28 PM
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hey heres an idea, why dont you look at you fuel temps, you already have the sensor

mike
Old 01-09-03, 02:02 PM
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actualy i dont. i have custom primary and secondary rails. and tossed the old ****.
Old 01-10-03, 08:14 AM
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If you have never looked at fuel temps during the summer it might be interesting. I recall 40+ degC after driving with 1/4-1/2 tank, filled tank and it dropped to high 20's low 30's.
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