Yes there is no problem - You only need to run it for about 30 sec to get a flow check - thats about 200cc . I use a cheap solvent for the test (Methyl hydrate or kerosene) and half fill the spray bottle. The small change in the volume does not cause a noticeable change in pressure.

I am going to insert a smaller container inside the sprayer for the Seafoam (considering it cost me an arm and a leg!) and use it to clean the inside of the injectors after I ultrasonic clean the whole thing (also in Seafoam).

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Looks good Graham if you are going to store the injectors for any amount of time run the kerosene or a kerosene diesel mix through them first, then seal them up. it stops them from rusting.
cheers
Barri

__________________
61 Austin mini
67 Lotus 7
74 450sl
76 Cadillac 8.2l (501 ci)

some new cars

megasquirt conversion on:
djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/
cis 76 450sl http://www.merccismegasquirt.britautorepair.com/

the best view is always from the point of no return

Thanks barri,

I might actually install the injectors and start on the other set. Must go out and buy some tubing though.

Re our discussion about putting the yellow injectors in the 4.5L. I was checking my inbox and came across a message from you! It was regarding an eBay auction for a set of new yellow injectors. Auction is no longer available. Just wondered if you bought them? I think the seller was in Quebec.

On same subject, I came across a site where they are offering an injector kit that will improve the gas mileage on a 4.5L . Says to install their injectors and then make two small adjustments to the car!

It says: "8 injectors - Bosch increases fuel ecomony and power up to 25%
2 simple electronic adjustments to be done" . Cost is $885 which is not bad if they are Bosch. This is along the lines of what I was thinking of doing. Smaller injectors and adjust the MPS and ECU idle screw. It has this picture:

Attached Thumbnails

 

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5

Completed cleaning and testing injectors today. All injectors have similar spray patterns. Timing the flow, I was like a one arm paper hanger and I am sure errors occurred. I basically had to touch a wire against the battery terminal at exactly same time I started stop watch. It would also be much better to have a proper lab type measuring cylinder to measure volume collected. I had to make marks on masking tape, then measure volumes later using a rough measuring unit from our kitchen!

The upgrade for my "test bench" will be 4 graduated cylinders and I will fire 4 injectors at a time using a spare rail that I have. This way, it will be obvious if the flows are different. I don't care what the flow is exactly, so long as all are the same.

My results were (at ~28-31 psig):

328, 378,321,365,399,342,326,367 cc/min Average 353 cc/min. This is equivalent to 432 cc/min at 3 bar. Book value is about 485 cc/min depending on who you believe! So, my flows are on low side. Pressure gauge is suspect, but can't be that far out. Maybe I will re-clean the screens - They may be restricting the flow. There is also a 1/8" fitting on the brake reservoir cap that is in the line - it may cause some pressure drop before the injector. I should take that out of there!

I only used 8-10 sec intervals, so there was lots of room for errors!

Thanks to barri's advice about using a jig to install the pintle caps, that job went smoothly - Because injectors were warm from testing and caps cold from being in unheated workshop, I gave each cap about 20 sec shot with hot air gun before installing. They slipped on easily, but I did have to hammer them the last 1/8" or so.

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5

I am finally getting around to installing the cleaned injectors. I have the old ones out of the car. The replacement ones were stored in Ziplok bags after squirting a bit of WD-40 into them.

I tested the ones I have removed and found one that leaked a bit. That got me worrying about the "new" ones.

I had a small brainwave I hooked up my Mighty-Vac clone and found a hose that just fitted over the business end of the injector. Pulled about 25" vac and watched needle for a few minutes.

7 of the 8 cleaned injectors held vacuum with no drop. But the other one leaked down immediately. I hooked it to a battery and cycled the needle a few times. Tested again and it held vacuum.

I did same test on "old" injectors - They actually held fairly well, but there were slow leaks. Had to hold vacuum for 5-10 minutes to notice them.

Thought I would share this, because it is a quick and dirty way to survey a set of injectors for leaks. Should be about same as applying 14psig pressure.

PS: I am going to run some Seafoam through all the replacement injectors while cycling the needle, before I re-install them.

__________________
Graham
85 300D,72 350SL, 98 E320, Outback 2.5