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Old 12-20-2005, 02:00 PM   #1
4cstr
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more fuel in a Detroit 60 series

Detroit 60 series:
The head has an inlet fuel hose from the injection pump and the fuel-return-to-tank hose on the back of the head. Take the return hose off (do make sure you get the hose right) and there is a fuel restriction there. There is a hole about the size of a lollypop stick in the back of the head where the hose was screwed on. Take a regular 3/16" drill bit and drill that hole out to about the diameter of a cigarette and reinstall the hose back onto the back of the head. It'll give you about a 30 horsepower increase and SUPPOSABLY not do nothing to your fuel consumption. This mod fools the computer and allows more fuel to be injected.
 
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Old 01-14-2006, 12:05 AM   #2
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That will REDUCE HP and Tq because the fuel pressure will most likely be LOWER providing LESS fuel to the injectors.

The restrictor is in the RETURN line, and is installed to give the fuel pump something to pump against, and to allow air-bleeding.

It will also, without any question, return even more HOT fuel to the tanks, raising the fuel temperature and therefore reducing it's energly per gallon (less power and economy).
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Old 01-14-2006, 03:15 PM   #3
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It's just info I got from another forum. I never tried it. That's what it sounded to me when I read it the first time too.
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Old 02-18-2006, 11:31 PM   #4
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almost right

First thing is to record your idle fuel pressure. This can only be done on the older engines btw. NO DDEC5 engines. Fuel pressure at idle cannot be less than 14 psi. Does not matter about nl fuel pressure, just idle. This is needed to supply the engine with proper fuel at idle. You can drill the restricted fitting out to the next size drill bit but keep in mind the idle pressure. Yes you will get 30 hp more. The reason is the cooler fuel, not for any other reason. Coooler fuel results in more hp. It will not raise the fuel temperature in the tanks or an other such story. I used to be able to drill the fittings but the company and DDA published a letter on doing this very thing. BTW, it violates federal emmissions also.
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Old 02-19-2006, 02:35 PM   #5
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"Cool fuel temp".

Nope. The fuel temp is a function of tank temp, engine temperature, and return flow. Moving more fuel thru the head by enlarging the orfice will only make it cooler for a SHORT TIME. As you move more fuel thru the head, it will transfer more heat from the head back into the fuel tanks, which will obviously increase the tank and then the inlet fuel temperature.

Stock, a Series 60 will RETURN 90 gallons/hour of fuel during "cruise" to the tanks. If you enlarge the orfice, it will return over 120 gallons/hr, and as much as 150 gallons/hr.

Returning more HOT fuel (much hotter than when it left the fuel pump) to the tanks, CANNOT reduce fuel temperatures, except temporarily.

I could go thru the math on how long precisely, but w/o knowing the new orfice size, it would not be worthwhile.
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Old 01-01-2007, 12:22 AM   #6
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All i can say is that it works did it on my old detroit and made a noticeable difference.
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Old 01-01-2007, 08:41 PM   #7
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Thanks for the feedback!
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my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 98 Jetta VR6.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
www.freewebs.com/nevrenufhp
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Old 04-02-2008, 12:03 AM   #8
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what makes you think that you cant check fuel psi on a ddec 5? it can be done, how else can you troubleshoot a possible fuel problem?
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Old 04-02-2008, 02:28 AM   #9
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Quote:
Originally Posted by ddctech
what makes you think that you cant check fuel psi on a ddec 5? it can be done, how else can you troubleshoot a possible fuel problem?
I can and do. It ant as easy as it used to be.
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Old 03-18-2009, 05:37 AM   #10
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you can also change the map sensor bolted on the side of the intake driver's side helps some and better mileage. If anyone wants a part number I can get it
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