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Bosch developed an electronic fuel injection system, called D-Jetronic (D for Druck, German for "pressure"), which was first used on the VW 1600TL/E in 1967. This was a speed/density system, using engine speed and intake manifold air density to calculate "air mass" flow rate and thus fuel requirements. This system was adopted by VW, Mercedes-Benz, Porsche, Citroën, Saab, and Volvo. Lucas licensed the system for production with Jaguar. Bosch superseded the D-Jetronic system with the K-Jetronic and L-Jetronic systems for 1974, though some cars (such as the Volvo 164) continued using D-Jetronic for the following several years.
The Type IIIs all had the Porsche-inspired air-cooled 1600cc "pancake" engine, a four-cylinder answer to the BMW boxer design, squirreled away behind the rear wheels in a seemingly impossibly small space, and, since the engine was secured to the differential by just four bolts and weighed less than I did, I could have it out of the car in just 15 minutes. I did so on the side of the street in San Jose one time when I sucked a valve and had to do an on-the-fly rebuild to get all the shrapnel out of the case.