MFI Injector lines

[jcge]

I'm gathering information to document how to rebuild (make from scratch) replacement MFI injector lines.

Material = Double wall steel bundyweld tubing (can any body confirm internal and external diameters and materials ?)

Flare form
Warren Hall Jnr (Early S Man)
posted some time back that the lines used a DIN flare

I'm assuming that this is similar to the DIN 74234 bubble flare form 'F" (see below) but haven't determined if it was the "F" or "F 180°" form - any suggestions ?? Nut and recesses would be to DIN 74233 parts 1 Nuts, and 3 Bores)



In both F forms - the end is finished at an angle of 115°, which provides a small amount of "crush" as it tightens against the 60° cone of the injector inlet - effecting the seal.

The difference between the F and 180° F is at the back of the flare - the 180° form has a right angle step in the tubing, versus the gentle "bubble" form of the standard F form.

Hazet, Stahlwille (#165) , Gedore etc all make flare tools to deliver these flare forms.

Any info or pics (esp closeups with caplier dimensions of the standard flare form)would be greatly appreciated.


Thanks
John

[Fritz Peyerl]

I checked my lines and it is the "F" doppel-boerdel
The inside diameter is 2mm
Outside diameter is 6mm
the finished boerdel diameter is 8.5mm

hope this will help

Fritz

[jcge]

Thanks Fritz - appreciate your rapid response
John

[jcge]

Here's a link to TI Group's automotive division (the owners of "bundyweld tubing")

Bundyweld Tubing

Based on their product lineup, I'm assuming the wall thickness for the tube is
0.028" = 0.71mm

Can anybody confirm this spec ?

John

[Fritz Peyerl]

0.028 inch = 0.071 12 centimeter
you are correct