Fuel line sizes?
Turbo Mini Forums

I've currently got 8mm OD feed, and 6mm OD return lines. Is this OK for a turbo setup?

1994 Mini Mayfair, 1330, Mspd Ph2 cam, Benross turbo head, 9:1, GT1752, TT Intercooler, MegaJolt, BMW M3 leather seats.

the return should in theory be larger than the feed, although some have the same size.

Personally i'm running 8mm OD supply and 10mm OD return

Not that I disagree, but why would the return be larger than the feed? Surely it will always be flowing less than the supply will?

1994 Mini Mayfair, 1330, Mspd Ph2 cam, Benross turbo head, 9:1, GT1752, TT Intercooler, MegaJolt, BMW M3 leather seats.

it is to ensure there is no pressure build-up that could affect the performance of the regulator

Same size for both will be fine. I wouldnt do big feed small return for the reasons Rob says.

Unless lines are too small to begin with, dont think there's any need to do return bigger than feed.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Both my feed and return are 8mm

They don't die, they just get faster!

I ran mine like that years ago and it worked fine but it's not ideal.

10mm is OTT in my opinon. 8mm is more than enough.

Both mine are 8mm

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

8mm is enough to feed both of the 2 most powerful a series on here

thats why mine are 10mm lol

Yes i moved to the darkside

Instagram @jdm_brett

OK, cheers, I'll go with both 8mm OD.

1994 Mini Mayfair, 1330, Mspd Ph2 cam, Benross turbo head, 9:1, GT1752, TT Intercooler, MegaJolt, BMW M3 leather seats.

Are people talking about 8mm OD?

If so, what diam' braided fuel lines are people using?
Fuel tanks I have been looking at have -6 AN threaded inserts fitted, but this being 9.5mm is a lot larger than what most people here are running.

David.

I've just done mine.
I used 8mm (od) copper fuel pipe and 8mm (id) braided hose.
The mpi tank has 8mm feed and return as does the fuel filter I'm using and the fuel regulator. The carb is 6mm feed, so I can't see it being too restrictive...time will tell I suposse.

Josh

My build thread..

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=542985

Tube is usually measured in OD while hose is measured on ID

Pipe is another ball game altogether lol

7mm feed and return on mine (Because someone at Rover thought it would be a great idea to make the SPI with an odd-ball size).

At 15 psi, flow rate is enough for 250bhp.

Dave, just plumbed all mine in -6, looks like it should be fine for the job

Splendid, thanks Nick.

I can get more of my crap ordered soon then.

David.