-6AN return line for 1000 WHP E85?
FormerVendor
Joined: Dec 2001
Posts: 2,444
Likes: 2
From: WWW.SPEEDINC.COM
The -6 return will be fine. Look at it this way, if you put a straight through coupler in place of the regulator and ran the fuel pump(s) with the engine not running you are now at maximum possible recirculation. How much pressure would you see at the rail? Probably close to nothing.
Only time return line size could effect fuel system performance is if it was so small it didn't allow the regulator to control pressure at idle. (Say you were going for 43psi base pressure and no matter how far you turned out the regulator pressure wouldn't drop below 50).
If this doesn't happen (and wouldn't with a 3/8 line) then the regulator is the return restriction and going to a bigger return line would serve no purpose.
You could run a -8 feed as well if you want to save some cash over -10.
Only time return line size could effect fuel system performance is if it was so small it didn't allow the regulator to control pressure at idle. (Say you were going for 43psi base pressure and no matter how far you turned out the regulator pressure wouldn't drop below 50).
If this doesn't happen (and wouldn't with a 3/8 line) then the regulator is the return restriction and going to a bigger return line would serve no purpose.
You could run a -8 feed as well if you want to save some cash over -10.
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TECH Apprentice
Joined: Feb 2012
Posts: 360
Likes: 3
From: Montreal
The -6 return will be fine. Look at it this way, if you put a straight through coupler in place of the regulator and ran the fuel pump(s) with the engine not running you are now at maximum possible recirculation. How much pressure would you see at the rail? Probably close to nothing.
Only time return line size could effect fuel system performance is if it was so small it didn't allow the regulator to control pressure at idle. (Say you were going for 43psi base pressure and no matter how far you turned out the regulator pressure wouldn't drop below 50).
If this doesn't happen (and wouldn't with a 3/8 line) then the regulator is the return restriction and going to a bigger return line would serve no purpose.
You could run a -8 feed as well if you want to save some cash over -10.
Only time return line size could effect fuel system performance is if it was so small it didn't allow the regulator to control pressure at idle. (Say you were going for 43psi base pressure and no matter how far you turned out the regulator pressure wouldn't drop below 50).
If this doesn't happen (and wouldn't with a 3/8 line) then the regulator is the return restriction and going to a bigger return line would serve no purpose.
You could run a -8 feed as well if you want to save some cash over -10.
Thanks for the input, reading on line there is a lot of conflicting ideas on the subject and Ive been under the impression that at an absolute minimum a -10 feed and -8 return was required. Id really like to be able to use the factory -6 AN feed line as a return and save some dough.
TECH Apprentice
Joined: Feb 2012
Posts: 360
Likes: 3
From: Montreal
Thanks for the input, reading on line there is a lot of conflicting ideas on the subject and Ive been under the impression that at an absolute minimum a -10 feed and -8 return was required. Id really like to be able to use the factory -6 AN feed line as a return and save some dough.
http://aeromotiveinc.com/wp-content/...werPlanner.pdf
