fuel pipes diameter
Turbo Mini Forums

what you people say is a good size for feed and return for pipe sizes.

i was thinking of using the standard pipe for the feed and i have got a metro turbo return which i think is 5/16. and hopefully use the standard outlet from the tank.

i was going to make a special t piece on my lathe so the return can be plumbed in just before the 12mm inlet to the pump rather than going back to the tank.

i wouldnt imagine my total bhp output be more than 150 .

just wondering if the above sizes would be sufficiant.

always looking for them bigger bunches of bannanas

i have 5/16 inside dia" bore feed and return
more than up to the job.
having said that.........

i nice tip, if you go to your locall plumber merchants or sy BQ. they sell this stuff in 12 meter rolls for around 15 quid ish, copper, and it dont rot
its used for micro bore systems for centrall heating.

i have plumbed my return in at the side of the breather in the tank brazing in a Sleeve for a rubber pipe to connect:
in with the Sleeve internal in the tank i brazed a length of pipe say 10" bent down inside the tank:

this is my return:

Edited by BENROSS on 13th Feb, 2005.

If you have a larger return than pressure feed it will reduce the strain on the pump as it will only have to output high pressure upto the regulator. Once it comes out the reg its pressure will drop as it comes into the larger bore pipe.

I personally use 8mm pressure and 10mm return lines.

true but,
the reduced pumping velocity the pump sees in terms of of watts is negligable

i suppose every little helps

a question i have is, how necicerry is it really to have the return a bigger ID than the feed? does it still work fine i am planning on 8mm feed and return.

thanks, and sorry for hi-jacking.

Dan

i'm running 8mm feed and return and haven't encountered any problems that i know of yet.

exelant bud, cheers for that.

Dan

main thing to check is that once its all in that you can lower the pressure right down. if it doesnt go down far enough then it shows that your return is too restrictive (or your feed is not restrictive enough)

I run standard pipe work for the injection mini what ever size they are, but i'm sure there are much smaller than everyone say you need! so that's saying some thing isn't it, big isn't always best.

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so if i do have trouble when i come to set the fuel pressure (to low) then i can just add a restrictor like, to the feed?

cheers, Dan

Been covered at least twice before. Search for 'restrictor'

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=1456

Can also depend on how strong the spring in the regulator is, even with the adjuster removed some regulators may only go down to 3psi. I have tried 2 different regulators, 1 went down to 2psi, the other to 3psi, simply because of the slighly different springs they had.

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