Use DCOEs as ghrottle body?

[itiejim]

I'm currently building an Alfa twin spark engine to go in my 1968 GT Junior - the older Nord based engine rather than the later FIAT based one.I would prefer to run it with an internally mounted ECU and with injection, but would like it to look reasonably authentic at first glance.

So, my question... The Alfa 75 used a very stubby little inlet manifold with injectors very close to the ports which then linked to a single plenum with throttle control. Is there any reason that I couldn't just use this original manifold, link them to the DCOEs and just let the carbs act as throttles? Clearly they'd need to be air tight and have a throttle pot fitted. Any thoughts?

[itiejim]

Thank you folks. Looks like something worth exploring then. Good call regarding the initial throttle opening. Perhaps this can be partially addressed by changing the linearity of the throttle pot if possible?

[itiejim]

Regarding mounting the injectors under the carbs, this was my initial intention. However, looking at the 75 manifold, it's so slim and innocuous and gives the injectors a lovely straight squirt down the inlet port that it seems a shame not to make use of it.

[itiejim]

Sorry, I wasn't clear - that's where they're already mounted, hence my thought to retain a known and successful location.

[itiejim]

DVandrews said:

Mounting a pot on the end spindle isn't too hard, you just screw on an extension with a D piece to engage the TPS and make a small mou t for the pot. For best power you need the injectors as near to the trumpets as you can, for best transients you need them as close to the inlet valve as possible, with DCOE style throttle bodies which are designed to replace DCOEs the injector bosses are close to where the DCOE throttle plates would have been if you get my meaning.

Dave

I'm just after a lively, torquey, driveable engine really, rather than the last BHP. Based on that, is there any reason why the original location - very close to the inlet valve - wouldn't work with the DCOEs acting as throttle bodies? Injector location is very similar to the below.

http://www.berlinasportivo.com/forumpics/q4/inlet....