NA EFI question

[madoski]

Just wondering if anyone here can answer this:  if one wanted to take a standard carb and turn it into a throttle body for a standard port injection kit (with an injector feeding each intake runner)...say by cutting and welding the top part of a manifold onto  the head side of an EFI end casting, with stock injectors from a Golf or something, using a tuneable system like a Megasquirt, what would need to be done to the carbs?  I know this probably exists in a kit, but I don't want to use a standard 44 IDF or whatever they're modeled after, and I have stuff to experiment with.  Could you just plug up the jets and fuel fittings and leave the butterflies to regulate air flow?  Air intake requirements should be about the same regardless of whether using carbs or injection, right?  Thanks for suggestions/ideas!

[dangerous]

I think Don Pauter did this when he changed over to the CB EFI,
but used 48IDAs.
There is probably merit in trying to mount the injectors high.
Carburettors , despite their archaic(sp?) mixture adjustments,
achieve unmatched atomisation.

[madoski]

Interesting...better than modern injector design?  Where would you mount the injectors?  As close to the base of the carb as possible?

[Jerry D]

You would need to mount a TPS (Throttle Position Sensor) on the carburator throttle shaft. I would mount the injectors as close to the intake valve as possible to maintain atomization and keep the intake valves cool. Mounting the injectors near the original carb location you would lose a lot of the EFI benefits.

[madoski]

Thanks.  Good point about the TPS.  I imagine that could be tricky to calibrate...

[Miller Brothers]

You would need to mount a TPS (Throttle Position Sensor) on the carburator throttle shaft. I would mount the injectors as close to the intake valve as possible to maintain atomization and keep the intake valves cool. Mounting the injectors near the original carb location you would lose a lot of the EFI benefits.

hi,
I too wondered about injector nozzle location, and am working on another EFI engine. I found this article to be interesting, so I am posting it for you to read also.
 
have a great day.
Scott

here it is:

http://www.hotrod.com/pitstop/hrdp_0704_pitstop_fuel_injector_location/index.html

[Jerry D]

Considering the length/amount of bends in the manifold and the need for manifold heat to keep the fuel atomized in the manifold, I would mount the injectors as close to the head as possible to eliminate as many potential problems as possible.