Heath Robinson Single 45 Inlet

[Peredur]

Right,

Whilst stripping down my head/inlet I had a bit of an idea. Would it work if I used a 1400 MPI inlet manifold then instead of the TB made an adapter to fit a single 45?

Any reasons why this wouldn't work?

P.S. Road rally car so can't run twin 40s

Thanks in advance :thumb:

[_Jake]

id keep the injection tbh

[mk1nova_rich]

As above...but would a downdraught not be better? Im confused with how you are intending to mount it

[Peredur]

Ok, i'm intending to make an adapter to fit onto where the throttle body fits on the manifold then fit a weber 45 onto the adapter

[mk1nova_rich]

Ah right im with you. There will be a massive airflow restriction going into the manifold TBH I reckon it would be slower than standard so would stick with the injection

[Peredur]

Ok, might just put a DGAS on it. The car is a carb model, I don't really fancy running standard injection and I don't have DTA/Omex deep pockets

[mk1nova_rich]

What about a Weber twin choke carb or an SU carb?

[Peredur]

Yeah, a weber 38 DGAS downdraught

[garyc]

Some cars in my class are doing that running a split weber on the injection inlet. Apparently they do something inside to make them work properly. Depending on spec I would try a 32\34. I think a DGAS will be too big and you loose low end tractability.

[jimbob-mcgrew]

I like the idea of this peredur

whats the diameter of the mpi manifold opening ?

surely if you had a big enough carb to match that diameter, 48 or 50?, then pissed about with the fuel jettng to suit... in theory it would work wouldn't it ?

you'd need to roughen the inside surface of the manifold too, sandblast might be good for getting down those long legs.

what do people do to plug the injector holes ?