DIY Flowbench

[Andrew Hunter]

I can't multiply the circuitry because it is driven (and measured) by the
PC software (see the DIY EFI Project Flowbench).  Could I run multiple
saturated injectors with the current configuration?  I want to be able to
flow multiple injectors after the cleaning process to speed things up. 
Testing is done on one injector at a time and measured via the flowmeter.
The flowmeter I purchased is a Brooks oval gear driven meter.  Its a very
nice little piece but its pricey ($860 Canadian).

Andrew

> From: garwillis at msn.com (Garfield Willis)
> Subject: Re: DIY Flowbench
> 
> >...I incorporated a flowmeter and strobe light into the
> >bench since I have been doing alot of injectors for customers.
> >I would like to wire it to run 4 injectors instead of 1, but I really
don't
> >know if the circuitry can handle it?
> 
> Instead of agonizing over running multiple injectors (let alone 4) on
> your present injector driver, Andrew why don't you just multiply up your
> present circuitry you have (ya know, add 3 more?), and drive them
> individually? You're not constrained to drive them all from the same
> final wire/driver in a testbench, are you?
> 
> Dood, don't make this hard for yourself when it's not necessary.
> Individual drivers are ALWAYS a better idea (because the currents are
> already so high) unless you're stuck with a single wire in a
> pre-existing harness, and would have to do a major rewire to add more
> separate drivers. On a testbench, that shouldn't be a problem, right?
> 
> Paralleling up multiple injectors is NOT a grand idea; making special
> drivers to handle multiple parallel injectors gets the current levels UP
> THERE, and it's not something you wanna do unless you are STUCK with
> just a single wire or two in your harness. It's also not a stupidly
> trivial thing, as someone recently suggested, of just adding "a simple
> transistor switch". Sheesh, you put two TBI injectors in parallel
> (around 0.5-0.6ohm combined equivalent) and try to drive it with "a
> simple transistor switch", and you'll be pulling upwards of 20A and
> blowing fuses. A "simple transistor switch" gives you nothing as far as
> peak current limiting or current foldback. Phhhtttt.
> 
> OK, back to the sane world.
> 
> BTW Andrew, what did you use for a flowmeter? Did you use some sort of
> flow sensor? I'd be interested in knowing what you found.
> 
> Cheers,
> Gar
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org