Webers or EFI

[cliftyhanger]

Keeping the component costs down is good, so the fewer throttle bodies the better. But I would be interested in keeping the engineering to a min as well. So two bodies on a std manifold would sound like a better idea to me than a single one remote from it.

But as a matter of interest, how does one connect the throttle cable to those Jenvey throttle bodies - they don't look to take either the linkages for Webbers or Dellortos.

Graham

Clive Senior has Jenveys on his Ford powered Spitfire, perhaps he'll put a pic up! I learned very recently that Jenveys factory is only a few miles from me, I must go up and have a prowl one day!

Steve

The throttle linkage is just like weber stuff, except probably a bit different in design. Actually the jenvey linkage is a bit of a work of art, have a look at their website.

[cliftyhanger]

I suspect using a pair of huge TB's will not be a great solution. A single one on a plenium is a tried and tested solution used on 95% of cars out of the factory. And the sprint airbox looks a tidy solution too, with a single outlet at the front and plate to attach a TB. Why complicate it?

[sprint95m]

Others with much greater knowledge may correct me but I think that if you implement throttle body injection in the way that you are intending, performance gains would be severely limited.

Given the greater complexity of fitting EFI, it could be that Webers , perhaps with a 123 dizzy, are a better option.

Alan, this is an interesting comment and question, which I'll try to answer,

I am using a TR7 EFI inlet manifold. This has a boss for each injector at the base of each inlet runner (i.e. right next to the cylinder head port).
This arrangement, using a single throttle body, will have longer inlet runners than a Weber manifold, which is what you what, especially for economy and low down torque.
It is possible to tune the ECU for power, indeed you can make it switchable between modes (a feature many cars have and have had for some years now).
You can select the size of throttle body to suit the application.


For simplicity and perhaps to retain an original appearance it is possible to get fuel injector adapters for Strombergs (and SUs),
however this is very much a compromise resulting only in small gains of economy and no real difference to power, (as acknowledged by the manufacturer).


I am not sure about Webers (or Dellortos), but given that Alfa, on their flat four, went to EFI with no loss of performance but a big gain in fuel economy.......




thanks,
Ian.

[AlanH]

Ian

I didn't explain properly. I was talking about Jim's idea of using MGF throttle bodies on the standard manifold.

[sprint95m]

No problem Alan.




Ian.