MGB

[Orin B. Harding]

>I'm looking and listening.
>
>I'm not awfully familiar with the MGB head. Is 5 port = 2 siamesed inlets
>and 1 siamesed exhaust with 2 independant exhausts?

Yes, that's the arrangement; Intakes 1&2 siamesed and 3&4 siamesed..Exhaust #1 and #4 independent and #2&3 siamesed.
>
>Are we on twin carbs here?

No this is a '79 which had one Zenith 175CD carb.  I replaced the carb with the Ford throttle body, having made a base flange adaptor.  The MGB intake/exhaust manifold was retained.  The throttle body has one large injector and the one I used was for a 1.9L engine.  I tried the 2.3L injector but it was much too big.
>
>if so, then replace the carbs with injectors and use two injectors only like
>the Mitsubishi Starion system. 

What Mits. cars is/was this system used on???  The whole object here is to come up with an affordable EFI system for the MGB..The Electromotive system is in no way "affordable"..

In fact that may be a good system to adapt as
>it uses a Kharman (sp) vortex air meter off boost and a seperate ignition
>system. Just stick with the air meter and modify the bypass tubes to adjust
>the mixture close and then there is a mixture adjuster to fine tune it.
>Leave the electronics alone.
>
>
>If you want to make your own, then all you need to do is to fit cpu
>controlled mono to the injectors and cycle them. the injectors need to be
>sized to supply enough fuel for 2 cylinders at full power. The CPU would
>only provide environmental correction sucjh as battery voltage, water
>temperature etc and the mono would give fixed pulses when everything was
>"normal" The pulse rate would increase as the air flow increased. Then you
>could tune the CPU as other things needed doing.eg new cam.
>
>Just some ideas, try them on for size. If they don't fit, give me a hard
>time and I'll come up with more.

No, I will not be giving you a hard time!!!! I want to learn, so don't go away!!
>



>
Orin Harding - Greensboro, NC
('74 MGB-GT - '79 MGB Roadster - '95 3000GT, BRG of course!)