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Author: Subject: Build your own injector tester
scudderfish

posted on 16/1/11 at 08:29 PM Reply With Quote
Build your own injector tester

http://www.dinofab.com/fuel_injector_tester.html

May be of interest to someone.






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MakeEverything

posted on 16/1/11 at 08:54 PM Reply With Quote
He's a clever guy. Some good stuff on his site.





Kindest Regards,
Richard.

...You can make it foolProof, but youll never make it Idiot Proof!...

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BenB

posted on 16/1/11 at 10:04 PM Reply With Quote
It's just an adjustable astable. Trouble is it might have issues with high impedance injectors and you can only get a rough idea of relative flow (and not absolute flow or pattern) unless you have the right petrol substitutes to play with. But it's a start...
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Dusty

posted on 16/1/11 at 11:20 PM Reply With Quote
quote:

A word of caution about the N-channel MOSFET. Be very careful of the pin outs! These tend to vary depending on the manufacturer. Make sure you know the exact location of the gate, drain and source


Pity this bit is written in serbo-croat. One of those sites that instructs people who already know how to do it. I never did get electronics.

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owelly

posted on 16/1/11 at 11:38 PM Reply With Quote
There was a very good feature in PPC Mag a few months (could be years!) ago, showing how to build a test bench for injectors. I have no idea why I've posted this as it helps no-one. Sorry.





http://www.ppcmag.co.uk

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RazMan

posted on 16/1/11 at 11:47 PM Reply With Quote
That's good as a ghetto tester tool - connect to a pump and measure each injectors throughput over a measured time.
Probably best to do it in the open air though





Cheers,
Raz

When thinking outside the box doesn't work any more, it's time to build a new box

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coozer

posted on 17/1/11 at 02:45 PM Reply With Quote
I thought it was all about seeing how much fuel flows over a given time, collecting it in a graded jar??

[Edited on 17/1/11 by coozer]





1972 V8 Jago

1980 Z750

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matt_gsxr

posted on 18/1/11 at 09:32 AM Reply With Quote
I would have thought that you would plug all 4 injectors into the fuel rail, and run them at the same time. Then compare the amount of fuel between the different injectors. By doing this at different injector pulse times you can tease out some subtle problems.

In my view it isn't the electronics that is a pain for this job (you could just play the injectors the output from your stereo, or any amplifier capable of handing the current, 4 high impedance injectors have about the same load as a 4 Ohm speaker), it is the set-up for the fuel pump, injector rail, measuring cylinders, some way of supporting it, and some way of preventing the injectors firing off the rail when you pressurise it etc. by the time you have done it you have pretty much built a fuel injection system.

Megasquirt has a fuel injector test mode too FWIW.

Matt

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