7 replies to this topic

[alex-95]

I've had a look around but can't find a definite answer. Measuring mine that came off the car, the petrol pipe diameter  internal 4.75mm/0.19" and external 6.33mm/ 0.25" and the brake pipe internal 3.1mm/0.12" and external 4.75mm/0.187".

 

Does this sound about right? I know that when I go to buy it that this'll change slightly due to wall thickness and if it's measured internally or externally.

 

Cheers Alex

[GraemeC]

Sounds about right.  It was always 1/4" for fuel and 3/16" for brakes and is measured on the OD.

Ideally you wanr kunifer for the brake pipes.

[alex-95]

Sounds about right.  It was always 1/4" for fuel and 3/16" for brakes and is measured on the OD.

Ideally you wanr kunifer for the brake pipes.

Thanks, I thought it was OD, but it's best to check

Yep will do as well as petrol pipe unless I can find stainless steel.

[zerobelow]

Pipe is measured in outer diameter, while hose is measured in inner diameter. So a 1/4" hose will slip snugly over a 1/4" pipe. 

 

As for the lines, I second the cunifer, even over stainless steel. It's easing to work with, and is a more modern material which meets the pressure and longevity needs. 

 

You don't want copper for brakes -- stainless or cunifer only. 

[gazza82]

Kunifer or copper for fuel?

[GraemeC]

Actually, this stuff is technically tube, not pipe.
And pipe is measured in ID, tube is measured in OD.

[zerobelow]

Kunifer or copper for fuel?

For the fuel, either should be fine. However, it's simpler to use just one type of tube, so if using cunifer for brakes, might want to do for fuel as well. Also, the cunifer is supposedly a bit more long lasting so that might be a consideration, though either should last quite long.

 

Personally, I chose cunifer over the copper or stainless steel, for all my fuel lines, as well as brake lines. It is easier to mould than stainless, keeps it's shape better than copper, will outlast the car, and I was able to order it all from one supplier. 

 

 

 

Actually, this stuff is technically tube, not pipe.
And pipe is measured in ID, tube is measured in OD.

Right on :). I usually refer to it as tube, but slip up when the conversation starts with pipe. 

[alex-95]

Cheers guys, It's mainly  3/8" unions and 1 or 2 metric ones isn't it? what size metric one is it there is?