[Gmecm] Port injector wiring

[Curtis W. Moore]

Robin,

This is my first post. I've been hanging for awhile just reading. I'm
am interested in your post, and hope others chime in. I too am
interested in using a 1227727 to run a 4 cyl port engine. Here is some
of the high points as I have learned. Hopefully learned right. :)

1227727 uses low-Z injectors. You will most likely be running high-Z. I
don't think this will be a problem. See what everyone else says.

1227727 pulses the injectors every other ignition event. That should be
4 times for 2 revolutions of the crankshaft. (8-cyl)

Factory 8-cyl engines use what I think is called a "split plane"
manifold. One injector will feed 2-cyl on left bank, and 2-cyl on the
right. One pin would not feed one bank, and the other another bank. One
pin would feed half the engine, and one pin the other half. I would
have to see a manifold to tell you exactly what cyl are being fed.

I think I will wait for others at this point. This should be enough to
start out with. If I haven't explained myself very good, I will be
happy to elaborate further.

Curtis

--- Robin Handley <Robin at FuryWorld.fsnet.co.uk> wrote:

> It's been quite a while since I posted, so apologies if this is a
> really
> dumb question to return with:
> 
> I've been using ANHT in a 1227727 to control the ignition on my 4
> cylinder
> engine for a couple of years now. I'm using a reluctor trigger in a
> distributor to provide the trigger inputs via an 8 pin HEI.
> 
> I'm now starting to think about fuel injection, with one injector per
> port.
> Using my distributor trigger, the ECM doesn't know which cylinder is
> triggering at any time, but this isn't a problem for ignition as the
> rotor
> arm sorts it out. But what happens with injection? I can only think
> that all
> the injectors must fire at every trigger event - 'batch' injection.
> The
> on-line wiring diagrams for the 1227727 show one injector pin for
> cylinders
> 2, 4, 6, 8 and another for 1, 3, 5, 7. As ANHT is intended for an 8
> cylinder
> engine this suggests that more information is available to the ECM
> than my
> distributor trigger can provide. Is this right - I can't see another
> sensor
> in the wiring diagrams? Could somebody please explain to me when
> these two
> banks are fired, and how I should wire these pins up to my (only) 4
> port
> injectors, given that I'm using a distributor trigger?
> 
> Robin
> 
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> 


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