I always default to JP8 as its what we burn. But yes HUGE differences in 4,5, and 8.

JP4/Jet B is a gasoline/kerosene blend.. don't run in your truck!

JP5/Jet A is a kerosene based fuel

JP8/Jet A-1 is a kerosene based fuel, and has a lower freeze point than Jet A.

The biggest difference in #1 and Jet A/A-1 is the additive package, the additives make it a much "drier" fuel, which is why lubrication is needed.

 

2 qts Walmart TCW3 2-Cycle oil and 1 pint Power Service Diesel Engine Additive Cetane Booster and Water Stabilizer mixed with 25 gallons Jet-A.

Works great. Off-road only of course

 

also another problem with jet fuel is its thinner than diesel, it will clean out your tank and fuel lines. could plug up your fuel filter among other things... and as previously stated YES deff add 2 stroke oil!!!! jet fuel is WAY to thin to run by itself!!!

 

A friend has run jet A extensively in a 2006 5.9 mega. (off road of course)
60,000 miles with no problems at all. Jet A has 4.4% less btu so you will get 4.4% less mpg. A small problem.
You must add a lubricity additive. Buy and use "Lubricity formula" by Stanadyne as instructed by the product label. This stuff was made specifically for using Jet A in diesel engines. I confirmed this with a call to one of their chemical engineers. I also add 1 quart Walmart TEC 2 stroke oil per fillup.

Again, no problems ever. No funny smoke or anyother symptoms. NEVER add a red colored two stroke oil! Bubba

 

Hey AH64ID, sorry man but I gotta correct you... : Jet B is a blend of Kerosene based Hydrocarbon with a schmigen of C5iC6 added to improve RVP(reid vapor pressure) for the higher altitudes the cool F22 dudes probably use to fly in the good ol U.S of A or the F-18's in the great white north. Jet A 9for air liners) is mostly Light Distillate (light diesel) with about 20% Heavy Naptha (kerosene based blend). The Jet A stuff will give you better lubricity and well as more oomph too (BTUs). The only reason I know this is because I make the stuff and run the panel at a refinery. Mabye the air force/military spec is different where you are but this is how we make the juice up here in Canada out of good old dirty oil sand sludge and its how it leaves our plant....

Any questions???

 

Those are the specs that I was taught, and have the references here in front of me to verify it. (The stuff I have uses the term gasoline, but really its a Naptha blend w/ Kerosene, but gasoline is more commonly known, and derived from Naptha)

JP-4/Jet B is used primarily in cold weather operations as the flash point is much lower, but JP-8 is the main fuel the military uses today because the flammability is much lower.

Jet A is a fuel only found in the US, the rest of the world just has Jet B and Jet A-1.

As I understand it, the only difference in the Jet A-1 vs JP-8 is some of the additives, like Prist, that can be added after the fact.

As to which Jet's use JP4 vs JP8, not sure it has to be COLD where the engines are started, as the freeze points are within 1*C of each other, the main benefit is on starting the turbine in COLD temps.

Maybe they just don't get as technical with us pilot types?

 

Perhaps each area of the military has its own spec based on what aircraft it's going into? I know when the German Air Force is up here training we have to make a bunch of different operational adjustments to our process just to meet their fuel specs. I assume it's decided upon after years of trial and error, design, engine teardowns and performance. Maybe you'd know more on that which i find interesting... I always thought the Jet A vs Jet B had more to do with the height at which Military fighter Jets vs Airliners fly at to avoid gelling of the fuel at those elevations which I never thought about but should have.

Thanks for the end user info. Any and all is appreciated

 

Yeah not to sure, I fly pretty low so don't have to worry about the altitude...

Thank you for your info as well.

 

1qt of 2-stroke to each 5 gallons of JP is my blend. I have ran over 300 gallons of JP through my truck doing this method. $10 worth of 2-stroke for 20gal of JP. Again, off road only, of course.

 

Sounds like you fly out of gowen field. I know it's of topic, but were you by chance a part of the missing man fly over in twin falls for that warrant officer out of Kimberly?

That was one of the most beautiful things I've ever seen.

 

Was that the one on 20NOV of last year? If so then yes, I was in the lead aircraft.