Fuel

Meso · Post by **Meso** » Tue Nov 22, 2005 8:59 pm

Can any of you AME's tell me if there are noticeable effects on performance or engine indications from one fuel to another. Say you have a pt6 and usually use jet-b, you are at X airport that has only Jet-a, it's approved for the engine and you use it, are there any noticeable effects?

roscoe · Post by **roscoe** » Wed Nov 23, 2005 11:20 am

Jet-A is denser than Jet-B, so more energy per pound, light-off may be a bit slower in the cold, as it has a higher flashpoint than B,

Dash 27 · Post by **Dash 27** » Mon Dec 12, 2005 7:49 pm

Its been a while since I last checked, but I'm pretty sure Pratt recomends Jet-A for PT6 engines. As for the difference between the two, Jet-A contains no gasoline, Jet-B is approx. 70% gasoline and 30% kerosene. In colder temps, ie. higher altitudes, jet-b will have less resistance to flow due to its lower freeze point.
Possible effects that one can have is more carbon build-up on fuel nozzles, which you could probabley figure out which pretty quick if you run janitrols. I'm not 100% on this but I do think its "B" that will carbon up more. If anyone knows for sure, speak up!
As for performance, more BTU's in jet-A. Theoretically you shouldn't have to burn as much to get the same performance.
I don't fly them, I just fix them.
Check your P.O.H. for approved fuels.

Dash 27 · Post by **Dash 27** » Mon Dec 12, 2005 7:59 pm

Also, your fuel heater is suppose to take care of the viscosity thing when your oil temp is in the green.

teh_flyguy · Post by **teh_flyguy** » Tue Dec 13, 2005 7:10 am

Dash 27 wrote:I do think its "B" that will carbon up more.

Jet A carbon fouls more than B

Dash 27 · Post by **Dash 27** » Tue Dec 13, 2005 11:01 pm

thanks