914/6 Carb to Original FI Options

[mmascari]

I have a 914/6 conversion with a 3.0l SC engine. I have installed PMO 46mm carbs and considering switching to fuel injection. I would prefer to use stock fuel injection. Has anyone had success installing 3.2l engine Fuel injection components on a 3.0 engine?

[targa72e]

I am with Clay I hate carbs as well. Your problem sound like a tuning issue. If you decide to go with fuel injection couple things.
The adapters that have been mentioned are for running a 3.2 manifold on a Turbo motor with stock small 32mm inkakes . The intake on the 3.0 big port and 3.2 head are almost the same. 3.0 39mm 3.2 41mm and adaptors are not required.

3.2 head



big port 3.0



The indent for the fuel injector is a slightly different shape between 3.0 and 3.2. I gasket matched the 3.0 head to the 3.2 gasket with a dremel and bolted the intake directly to the head.
The main difference between 3.0 and 3.2 is the intake port height is different between a 3.0 and 3.2 head (beside port size) is the 3.2 is shorter and there is a thick (about 1/4" thick) gasket that goes between the manifold and head in stock application.



To use the complete 3.2 fuel injection system on a 3.0 is difficult. It would require complete rebuild of the motor, head machining for Temp sensor and 3.2 flywheel. The distributor on the 3.2 rotates the opposite direction of the 3.0 and would require changing the gear on the crank to use 3.2 distributor on 3.0. The 3.2 distributor does not have any trigger or advance mechanisms as the advance is controlled by the ECU and the trigger is from a sensor that reads the teeth on the 3.2 flywheel to provide speed and possition information to the ECU. Temperature sensor screws into 3.2 cylinder head.
It is much easier to use a aftermarket ECU. You can feed engine RPM information to the aftermarket system from the trigger wheel in the SC distributor (or use tach signal).
In my conversion I used the factory 3.2 manifold, throttle body (modified to include Throttle position sensor), fuel rails, injectors and lines.
ECU was aftermarket. Had to add the TPS, Map sensor, intake air sensor, O2 sensor and Engine temp sensor, these were all GM parts on my conversion. I used the SC idle air bybass for fast cold idle.

If you still have the SC intake the blitz system is a pretty complete kit for conversion to EFI.

john