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Old 12-30-2006, 02:01 AM   #1 (permalink)
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JP-8; Jet propellant eight... as truck propellant?

So... a while back, i was reading up on the 9/11 thing w/ the flash point and burn temps of Jet fuel. and i stumbled across info about Jet-A, Jet-B and JP8. i seem to recall jet-a being superceded by JP-8 due to a higher flash point and lower volatility which increased handling saftey when fueling commercial airliners as well as when commercial airliners are run low and have fuel vapor in their cells/bladders... i know jet-a is used commercially, but is JP8 also used in commercial and private airports or is its availability limited to US military use only?

then i also read that JP8 was engineered and blended for military usage too. JP8 is supposed to supercede JP4... which was originally just gasoline and kerosene blended together. JP8 is blended to us mil specs (MIL-DTL-83133) to be safer for handling and better combat survivability. apparantly, it was brought into service in 1990 and project to remain in service until 2025. JP8 is suppposed to be the universal fuel for generators, heaters, stoves, personnal carriers, combat vehicles, aircraft and other stuffs. from what i understand, JP8 is essentially Jet-A with additives. these additives serve prevent icing, corrosion, add lubricity as well as an anti-static property (prevents fuel cells from exploding mid-air during low fuel levels in aircraft). anyone concerned w/ gelling... the anti-icing additive in JP8 serves to keep the fuel liquid even in sub-arctic temps... seriously.

so we know that there are Detroit Diesels in use in the military, the HumVee's use the GM 6.5L motors (DD's right?). im assuming that they DONT use a Standyne pump like the 1st gen Ram's... which require a certain level of lubricity in the fuel itself. so... will JP8 work in our trucks? i have a friend who works for raytheon (the defense contractor) here in clearwater... hes told me that they use the jet fuel in all the diesels around and they just add 30wt motor oil to every fill up. would a P7100 be safe even w/o the oil additive if JP8 is used? if i cant get JP-8 at my local air ports/air parks, i assume i can use Jet-A if i add my own lubricants (like the fresh motor oil my friend mentioned)?

regards
chris
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Old 12-30-2006, 02:52 AM   #2 (permalink)
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Personally I would not run Jet fuel in anything BUT a P-7100 (with a MINIMUM of 5% added lubrication)...non detergent 30 wt oil, or better yet, 2 cycle oil would be a good choice for lube.

Check this out: Diesel Fuel Characteristics and use

Last edited by Dr. Evil; 12-30-2006 at 02:56 AM.
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Old 12-30-2006, 10:03 AM   #3 (permalink)
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I have run JP-8 in my duramax and cummins. It runs ok, it makes it a little louder, and I go from 18 mpg to about 9, so the energy content is less per gallon. The humvees really notice a difference in diesel vs. JP-8. It does run ok though. Less smoke than diesel. It does meet lubricity standards for diesel engines.
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Old 12-30-2006, 01:02 PM   #4 (permalink)
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well i did read taht article and noticed that the 7100 pump can use the other fuels. so i figured, in theory, that jet-a or JP8 could work as a regular fuel in the 2nd gen 12v trucks. the Jet-a reportedly has better lubricity than any other non-diesel fuel... but does Jet-A have a lower BTU rating than JP8 or is it about the same? i guess Jet-A would have to be at least half the cost of pump diesel ($2.71 here in clearwater, fl) if my fuel economy ends up halving during use of Jet-A/JP8. thanks for the input guys.

Edit... nevermind. ive been looking at Jet-A prices in my local airports. for self serve and/or assisted serve, its anywhere from $3.80 to $4.14. hardly as cost effective as i was hoping, considering it shouldnt have road fuel tax like automotive fuels. dang... oh well. maybe ill grease up the ol 12v.

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Old 12-30-2006, 02:29 PM   #5 (permalink)
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You can run that stuff, most every diesel in halfgasican runs it. But why would you? Put whatis supposed to go into your expensive diesel engine.:thumbsup
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Old 12-30-2006, 06:17 PM   #6 (permalink)
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Other thing is, it's designed for motors running at 40000 feet.....but has a multi purpose use, and easier for the military to get I'm assuming....besides, fuel mileage means jack st to them lol....just my theory
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Old 12-30-2006, 08:32 PM   #7 (permalink)
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When I was in during the late 70's we used JP-4 in the F-4's and Mo-gas in our Tugs. Due to insufficient funds some guys would try to run the Mo-gas in their cars but with limited success. You could barely light that stuff with a match!
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Old 12-30-2006, 08:37 PM   #8 (permalink)
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Unless you're just stuck in the middle of B.F.E., with NO other fuel available, then I can't see why anyone wouldn't just pull into a filling station and use #2 Diesel fuel. The JP-8 will work in a P7100-pumped truck but the lubricity concerns are so high I wouldn't want to chance a mishap. JP-8 is one of the lowest lubricity fuels available for use. It's got worse lubricity than ULSD. If you take ULSD, raw and unadditized, with NO lubricity additives added, the JP-8 is even WORSE. It should be considered an EMERGENCY-ONLY fuel.
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Old 12-30-2006, 11:57 PM   #9 (permalink)
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fair enough. the whole premise was based on whehter or not jet-a or JP8 could be had for cheaper than Diesel. but its far more expensive every where i look than just regular old pump diesel. jet-a would have to be like $2/gal for me to want to use it... even then, id would be mixing 3%-5% motor oil for the lubricant w/ the Jet-A. its all a moot point now, Jet-A is over $4/gallon!!!
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Old 01-07-2007, 01:39 AM   #10 (permalink)
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Currently a mechanic with army and around JP8 everyday. Yes we use it in everything. Yes it goes through Standyne pumps in Humvees and Bosch and Cummins pumps in our 5-tons. Personally would not use it unless I was in an emergency in my own vehicle. Also without putting some lube in it also like MMO or some 2 cycle. But it is a great fuel and burns in anything diesel for sure.
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