Mechanical fuel injection

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Mechanical fuel injection was used with engines made by the likes of 50's GM and Mopar high performance vehicles, 60's Corvettes, Audi and Mercedes-Benz, but fell out of favor with electronic fuel injection. A lot of the old American systems were unreliable, and a lot of owners switched them out for carburetors. The european systems came a little later and had the kinks more or less worked out. The main differences between mechanical fuel injection and a carburetor are 1. No carburetor but instead a fuel line (or 2) with an almost microscopic hole dumping into the intake manifold pulled by engine vacuum; 2. Airflow is delivered similar to electronic fuel injection, with a big hose going to a plenum that dumps into the intake manifold.

mostly used for racing, and land speed records in the 50's and 60's. enderle was one of the early innovators. these systems were used because EFI(electronic fuel injection) in the day was unreliable due to the electronics involved.