DIY Flowbench

[Garfield Willis]

On Wed, 24 May 2000 19:32:04 -0600, "Andrew Hunter"
<huntera at cadvision.com> wrote:

>...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

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