Identify Your Porsche® 928
Model: 928S and S2
Identify Your Porsche® 928 Engine
These photos will show you where to find the engine model on a Porsche® 928. There will be two numbers stamped into the block just below the upper radiator hose as shown. The top number is the Engine Serial Number. Below that will be the Engine Model Number, beginning with "M28/xx" The model of the engine is the two digits after "M28/"
The Model number will identify the compression ratio, Horsepower, Torque, and factory fuel system for that motor.
Identify Your 16v Fuel Injection System
There were one of two fuel injection systems installed on the 16v Porsche 928 engines, depending on where the finished automobile was going to be shipped (North America or ROW) and which engine was selected. It is easy to tell them apart.
Open the hood and look at the intake manifold. The K-Jetronic system (or "K-Jet) is a mechanical injection system. You can identify it by the fact that each fuel injector has a hard metal line feeding it and there are no wires to the injectors. See Picture.
The L-Jetronic system (or "L-Jet") is a first-generation electronic fuel injection system. You will see there is a fuel rail that runs across all the injectors (yellow arrows) and the injectors are attached to that rail by short rubber hoses. Also, each injector has some wiring going to it (Green arrows).
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