Optimal Fuel Temp - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 07-01-2008, 04:00 AM Thread Starter
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Optimal Fuel Temp

Ok so what is the optimal fuel temp for fuel in the PSD? I'd like to know the optimal temp for most complete combustion (Going after Mileage)and what temp yields the most power. I asked this question in the quad feed thread and it got lost. So what temp should the fuel int he system be so that it's perfect or as close to perfect in the fuel rail before it heads to the injectors bot best burn and most power ????

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post #2 of 13 (permalink) Old 07-01-2008, 04:05 AM
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Re: Optimal Fuel Temp

I remember something on TDS years ago about what CAT used for their test cell engines. It seemed that it was stated that the temp they used was the best for mileage and power. Too bad I can't remember the number.
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post #3 of 13 (permalink) Old 07-01-2008, 04:06 AM
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Re: Optimal Fuel Temp

dennis at itp i think was doing some research on this subject, pm him
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post #4 of 13 (permalink) Old 07-01-2008, 05:20 AM
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Re: Optimal Fuel Temp

Dennis did some testing to see if dropping the fuel temp would help, here's the 3 pages I know of:

page 1
page 2
page 3

It's been a while since I read this, but if I remember correctly, he was seeing if adding fuel coolers would make a difference, and it didn't. I could be wrong though, it's been a long time since I read that.

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post #5 of 13 (permalink) Old 07-02-2008, 02:29 AM
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Re: Optimal Fuel Temp

Caterpillars SPEC is 60* F OPTIMAL---test cell---

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post #6 of 13 (permalink) Old 07-02-2008, 02:43 AM
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Re: Optimal Fuel Temp

That must be the balance between best flow and density I guess.

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post #7 of 13 (permalink) Old 07-02-2008, 02:44 AM
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Re: Optimal Fuel Temp

I would have to think that it would be the coolest temp where it is most viscous with no sign of gelling. That way it is warm enough to inject and properly atomize. What temp that is, I dont know.

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post #8 of 13 (permalink) Old 07-02-2008, 02:47 AM
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Re: Optimal Fuel Temp

I posted what the optimal temp is above....Cat knows best atleast on how to test one that is.

There is indeed some science behind 60* F

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post #9 of 13 (permalink) Old 07-03-2008, 04:29 AM Thread Starter
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Re: Optimal Fuel Temp

My problem with that temp is that is just not realistic in the real world. I wonder if Dave's idea of a AC condenser in the fuel tank might have some merit for summer time fuel cooling. I still think 60 deg F is low. I wonder what the upper range is where the fuel still have 90-99% of the optimal properties.

I guess I'm going to run up to the Drags on Empty and then fuel up with a full tank of nice cool 55 deg fuel @ the local truck stop before heading in to insure my fuel is as cool as it can be before I start running.

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post #10 of 13 (permalink) Old 07-03-2008, 05:45 AM
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Re: Optimal Fuel Temp

I need to see a 7.3 running on an engine dyno at load and then start bringing in the warmer fuel watching power output.

I need an engine dyno I guess.

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