John..

I devised a way to run and test fuel injectors without having to pay someone $25.00 and injector to do it for me. That adds up when you have a V8. I think the whole thing cost me maybe $15.00 (including the cleaner).
I made my own pressure cell out of the following:

A 2 liter bottle...Diet Coke I think?
A valve stem
A threaded lamp stud (the hollow ones for wire to pass through)
Three nuts to fit the lamp stud
Teflon Tape
A 3' piece of fuel hose
Two hose clamps
A voltage supply (from my 1978 Tyco Night Glow race track set...too bad it didn't have Porsche cars) with an adjustable voltage regulator.
One lemon juice bottle (I'll get bitched at later for taking this out of the frige without asking)

The lid of the 2 liter bottle can be drilled to fit the valve stem, and the threaded stud can be drilled and mounted in the bottom of the bottle. I wrapped teflon tape over the threaded stud and double nutted the back side of it (inside the bottle). Then, I just tightened it all down and put the hose on with the hose clamps.

Filled the bottle up 1/2 way with gasoline and hooked the other end up to an injector. All you need to open the injector is about 9 volts....a supply is best, but a 9 volt battery works fine as well. I found the injectors acted funny with only three volts, mainly because my supply could not hold the voltage requirements of the coils inside the injectors.

I flowed all 8 injectors, first with sea foam carbon cleaner and then with some gasoline. The sea foam atomizes differently than the gasoline, so be sure to check your injectors with gasoline. The sea foam really cleaned them out without difficulty, and I had two that would not even open up at all (they are used ones I am putting in the car) I sprayed the gasoline down into a glass bottle to watch the spray pattern. Set the gasoline level the same each time and pressurize the bottle the same each time and you can check for balanced flow on your injectors by marking the level of the gas passed per unit time (I did 1 minute to check static holding of the injector) Mine were all real close in flow, which is very good, considering two of them would not even open when I received them (used). You can also reverse flow the injectors as well!

The 2 liter bottle setup is relaible to 60 psig, but I would stay with 40 psig for testing purposes. I ran my setup at well over 60 psig without the bottle breaking. If it ruptures, make sure you are looking the other way!!!!!

Just thought I would share this info with you guys. I never like to pay money for something I can do myself (Specifically when I can take my time and do it more thoroughly than someone who is in a rush to finish).

928GTS

Very interesting John and good info. Are you saying that you can pressurize a 2 liter plastic bottle to 40 psig and it won't burst? How do you connect the injector to the hose? Clamp it on?

Randy

BrianG

What is "sea foam" <img src="confused.gif" border="0">

John..

You just use a hose clamp at the threaded stud and then a hose clamp at the injector. Mine are hose end injectors, so I don't know how you would do an o-ring end injector, but I'm sure it could be done. I pressurized the bottle to 65+ psig with no problems whatsoever. It will burst if you go too far, so be careful.

The sea foam is a carbon cleaner, much like Techron.

I have two leaky injectors, so I have a few spares I have to clean up. The local shop wanted $15.00 per injector to clean them and another wanted $25.00 per injector.

Their "rebuilding and flowing" consists of cleaning the injector, installing new covers and screens. I got 10 covers and screens for $12.00 from a diesel injecton shop here in town.

slate blue

If that bottle ruptures with gas in it beware, I take it you've heard about spontanous combustion. Not worth the risk! <img src="graemlins/nono.gif" border="0" alt="[nono]" />

Randy V

Nice idea, though instead of gasoline, you might want to use something with a higher (safer) flashpoint - perhaps Naptha or kerosene.

I get nervous when I see flammable liquids used in close proximity to an electrical device - reminds me of my unfortunate highschool buddy who decided to clean up some spilled gasoline with a shop vac...

Incendier

How did you pressurize that bottle, John?

John..

You guys just need to live dangerously like I do. I don't think spontaneous combustion comes into play here, but if a small spark was to ignite the gasoline, well let's just say this could pose a problem. Heck, I had lots of experience playing with gasoline as a child, why stop now?

I pressurized the bottle with a bicycle pump through a tire valve step put into the cap of the 2 liter bottle. You can easily pressurize the bottle to over 60 psig without rupture. I tried this first with a 5 gallon water bottle I took from work, but it cracked under the pressure at about 5 psig. The 2 liter bottles will hold massive pressure!!!!! My gauge stops at 60 psig, and I was well past that.

John..

The best part of all is the Bastard is now on a low fat, leaner diet of Super 93 octane. I should see an additional 3-5 MPG out of it, which is good when it only used to get 15 MPG

slate blue

Hi John would mind showing us some photos of your car? I'm particarly interested in how the engine is plumbed. Have you got hp results from a dyno? What abouts some 1/4 mile times. Cheers Greg

<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

chris928

how are you going to get 3-5 mpg more?

V-Fib

Using gasoline for anything but putting in the tank is akin to cleaning a loaded weapon. There are just some things you shouldn't do. I've worked in the Burn Units, you don't want to be there. Just MHO.

Anthony Tate
79/928 Silver Metallic <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

John..

3 to 5 mpg more comes from spraying 15 to 20% less fuel under NA conditions.

Let's face it, it is possible to light yourself on fire while pumping gas, or filling a lawnmower. It really doesn't phase me all that much. How about changing a fuel filer, isn't it possible to get a spark there with a wrench?

The piping in the engine bay is tight......quite a squeeze. Luckily I have flexible joints.

V-Fib

John,
Nothing personal, It's just now that I have Grandkids (I'm 45), my attitudes have changed. If you play with fire long enough.................
Good Luck <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Anthony Tate
79/928 Silver Metallic

Randy V

Geeze - grandkids at 45 Anthony?

They must be early breeders down thar in Texas <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" /> !