[Diy_efi] MGB EFI

[Jean Belanger]

You might want to have a look at Marcel Chichak's site to get an idea of the
problems with port injecting a siamese-port engine.
http://www.planet.eon.net/%7Echichm/efi/siamese.htm

You can also have a look at his attempt to do it on an a-series engine:
http://www.planet.eon.net/~chichm/efi/efi.htm

Basically the problem is that you need accurate injection timing and fast
and big enough injectors to be able to complete the injection while the
intake valve of cylinders 1 and 4 are open otherwise the fuel will go in
cylinders 2 and 3. It may not be clear but you'll get it if you read
Marcel's page.

Hope that helps,
Jean

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of WEG1192 at aol.com
Sent: February 7, 2003 11:14 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] MGB EFI


In a message dated 2/7/03 10:36:54 PM Eastern Standard Time,
tmadia at uswest.net writes:

> Unfortunately the firing order is 1-3-4-2 so each injector would have to
>  fire twice then switch.  Aargh!
>

Yep, thats a problem. cylinder 4 would get skipped over and cylinder 3 would
get two shots of fuel.

What about reprogramming a 7747 TBI ECM with 4 cylinders and then wiring a
single TBI injector into both injector drivers? I just checked and there is
a
4 cylinder setting in the 7747 binary. This is something I have wanted to
try
but lacked a 4 cylinder to try it on. Might take some heavy duty tweaking of
the binary though.

JW

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