Fuel injection 63-65 Plumbing question

[Jerry G.]

I am building a test jig for flowing fuel nozzels and need the size of the fuel spider lines and the compression fittings and the nuts that attach the nozzels to the lines. And, if anyone has a source for these small fittings and tees ,that would really help Jerry

[Dick W.]

Re: Fuel injection 63-65 Plumbing question

I am building a test jig for flowing fuel nozzels and need the size of the fuel spider lines and the compression fittings and the nuts that attach the nozzels to the lines. And, if anyone has a source for these small fittings and tees ,that would really help Jerry

Can't help with the sizes, but McMaster-Carr has a wonderful selection of tubing and fittings. http://www.mcmaster.com/#copper-tubing/=a5u3me Sizes from .0625 od up.

[Bruce B.]

Re: Fuel injection 63-65 Plumbing question

Jerry,
I will measure the tube size on my 57 FI tomorrow.

Aircraft Spruce Co. is a good source for tubing also.
Thier smallest copper is 0.125" od with a 0.031 id.
They a good people to deal with.
www.aircraftspruce.com

[Clem Z.]

Re: Fuel injection 63-65 Plumbing question

to be safe i would use stoddard solvent as it has close to the same density as race gas,.76/.78. at 60 degrees. back in 1957 we had a wooden fixture that held the FI unit and 8 graduated cylinders that lined up with each nozzle and we ran the pump with a drill to see if each graduated cylinder would get the same amount of CCs. i don't remember all the details but we had to apply vaccum to something.

[Tom P.]

Re: Fuel injection 63-65 Plumbing question

A light vacuum (connect a hose and suck on it) applied to the fitting on the main diaphragm cover is needed to raise/lower the linkage which controls the spill valve.
An ideal application of vacuum would be to have some method of controlling vacuum to the main diaphragm and be able to vary the vacuum. The vacuum signal to that diaphragm is VERY light-------------about like puffing on a cigarette. Although, I can't tell you how much to suck, because I DO NOT smoke!

[Jerry G.]

Re: Fuel injection 63-65 Plumbing question

A light vacuum (connect a hose and suck on it) applied to the fitting on the main diaphragm cover is needed to raise/lower the linkage which controls the spill valve.
An ideal application of vacuum would be to have some method of controlling vacuum to the main diaphragm and be able to vary the vacuum. The vacuum signal to that diaphragm is VERY light-------------about like puffing on a cigarette. Although, I can't tell you how much to suck, because I DO NOT smoke!

I plan to use the setup that Clem describes. according to the SAE technical paper that Dolza and Duntov wrote the control signal should vary from a few inches water column vacuum to around 30 " WC ( a little over 1 PSI). It could, under max flow conditions go as high as 60 "WC. I'm trying to match the output (fuel quanity) to input(control signal). Next month I'll be doing flow bench testing on my modified air meter with a machined transition to modify to control signal boost. I'm an old mechanical engineer who loves vintage racing and Rochester Fuel injection units so this is great fun.
I need the tubing and compression fitting sizes to make a test setup for pump output and individual nozzel characteristics. I have figured out a way to make disks of any orifice size so i need to understand how many pounds of fuel per minute can be deliverd. Just having fun. Jerry