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post #1 of 44 (permalink) Old 12-24-2009, 01:47 AM Thread Starter
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injector flow testing discussion

Anyone care to discuss flow testing their own injectors? How its done? Your method to make sure they don't spew oil or flow 50 cc's different between cylinders?
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post #2 of 44 (permalink) Old 12-24-2009, 01:56 AM
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Re: injector flow testing discussion

How hard would it be to build your own flow bench?

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post #3 of 44 (permalink) Old 12-24-2009, 02:06 AM Thread Starter
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Re: injector flow testing discussion

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How hard would it be to build your own flow bench?
Building the bench is easy! A cylinder head, sme graduated cylinders, oil, fuel, and electronics. Piece of cake.
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post #4 of 44 (permalink) Old 12-24-2009, 02:06 AM
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Re: injector flow testing discussion

When I order my graduated cylinder's, do you think I need to go bigger than 1000cc if you take into account the volume of foam that will be accompanying the 750cc set of injectors?

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post #5 of 44 (permalink) Old 12-24-2009, 02:11 AM Thread Starter
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Re: injector flow testing discussion

No way! I love it when the foam runs over the side! Gives great test results!!!
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post #6 of 44 (permalink) Old 12-24-2009, 02:24 AM
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Re: injector flow testing discussion

I use a pulse width modulator, with mosfet transistors to switch 110 volts across a 4 way diode bridge. The pulse modulator comes with software to link it to my laptop. I use 4ms 6ms and 10ms pulses at 500 1500 and 3000 psi oil pressure, for 1 minute . I use two heads and flow all 8 at the same time. I haven't found any big inconsistencies in flow, I think. 10 to 15 sometimes. I started using hydraulic fluid instead of diesel to test with. way less foam, and my wife doesn't chew my arse for the smell on my clothes anymore.
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post #7 of 44 (permalink) Old 12-24-2009, 02:34 AM
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Re: injector flow testing discussion

10ms? really? how often does that occur in your engine tuning? I would be more concerned from 0.5ms to 3.5ms, but that's just me.......

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post #8 of 44 (permalink) Old 12-24-2009, 02:38 AM
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Re: injector flow testing discussion

http://www.boondog.com/tutorials/2993pwm/2993pwm.htm
Here is a link to build your own CCPWM.

I use an electric portapower pump as I can dial the pressure to any set point I wish I could try 10,000 psi if I wish, but the thought scares me.
At 4,000 psi I pushed some of the o-rings out at the top.
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post #9 of 44 (permalink) Old 12-24-2009, 02:42 AM
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Re: injector flow testing discussion

If they are close at a 10ms they are real close at 2ms I would try more ms but the duty cycle of my PWM will not allow the Mosfets give it up.



I give the injectors more time to show inconsistency. I rationalize that the difference at short .5 or 2 ms pulses may be exponentially different at higher ms pulsewidths.
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post #10 of 44 (permalink) Old 12-24-2009, 02:44 AM
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Re: injector flow testing discussion

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You will laugh but I have a water cooled valve grinding machine that cut in graduations of .001. I can dead nut every measurement with patients.

The parts are hardened steel. you need a good grinding machine with a hard rock. I don't know how you feel about your lathe, you could try to find a similar setup somewhere as to not ruin your lathe with the small grinding specs. I have a jig that I ground out to grind the back seat shims,and a holder for the valve bodies. The valve grinding machine is already set up to grind any other part I might want to grind.
Nate, Im new to the 7.3's and Powerstroke performance in general so bare with me. Im looking to build injectors since I've been able to gather some good intel from a guy on the boards who knows more then anyone about these things.

I quoted a post from him above. According to this, I should be able to mod my injectors with the use of a DeWalt hand grinder with a hardened wheel and a good bench vise from Northern Equipment and tool

Thanks for your help guiding me through the land of ignorance


























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