The V8 Owners Forum -

Do the hotwire EFi systems have any parts in common with the older flapper ones? I was thinking mainly of the manifold, the base plate with the eight trumpets and the plenum cover. I'm about to fit a flapper system to an MGB GT V8 and have to have these parts milled down to clear the bonnet, I was hoping that in the future if I move to hotwire I could re-use the milled parts to save having to do it all again.

As far as I know the physical differences:

Injector fittings & fuel rail are different
Flapper has the stepper motor thing on the front; Hotwire has the idle vavlev on the rear of the plenum
Slightly different take-offs on plenum etc
TPS sensors are different & throttle shafts are different lengths (although can eb made to fit IIRC)

Out of interet, where did you get the machine work done and what did it cost? I have an MGB V8 with the ACT plenum, and although I have no issues hacking a hole in the bonnet (as the carbon does look yummy!) I'd rather not if its relatively easy and/or cheap. (I know how to do it in theory, jsut dont have the milling facilities)

thanks

I haven't had the milling work done yet, the car's still on the road so I thought I'd leave it all till the winter and do it then. I'm hoping it won't be too expensive, but I can imagine a machine shop reaction when you want 16mm cut away instead of a few thou on a head skim.

have you got the book 'How to fit a V8 into an MGB' or whatever its called? That gives the complete maximun amounts you can realisitcally shave off the inlet manifold. Think the total is about 28mm max.

if you find a good place, please let me know