Photos:Larry O'Rourke
Update: I talked to Robert at Fairchild Industries and the Carrera's Mechanical Fuel Injection Pump is done. He said that the pump looked fairly new
(lol) but the main problem it had was that all the cam followers had stuck (probably contaminated or old fuel). He said he had never seen this in a Porsche pump, only in Mercedes pumps. The cam followers sit on the fuel delivery cam that opens up fuel for a particular line going to a cylinder. It is timed with the engine so that fuel is delivered at precisely the right time when the intake valve is open and the piston is reaching top-dead-center. As a cam follower is lifted up by it's own cam lobe high spot, it delivers an exact amount of fuel to the injector for that cylinder. By the way, I sent Robert all of my injectors and he said that the six would work, but that they are sticky and need cleaning with a fuel additive for injectors. That should clean them up. He adjusted the idle circut to be slightly rich (normal procedure), but said that I could adjust it further by turning in or out the sprung-screw located low on the back of the pump. If you turn the screw clockwise or in, the pump will enrichen (at idle), and likewise turning it out leans the mixture.
The control rack is free now, and all fuel delivery pistons are within normal parameters. It is calibrated for a 2.8 liter RSR.
We are getting closer.