Indirect is not necessarily better or worse . . .just different. The most popular system is the Ricardo Comet, but there are several others also in use. Most USA and Britsh tractors, along with USA cars and trucks during hte 80s-90s used Ricardo Comet. Mercedes had a different system and so did Allis Chalmers with their Buda diesels.
Main drawback to indirect injection is energy loss due to excess heat transfer. Not a big one, though. Indirect diesels need bigger cooling systems then equal-powered direct-injected diesels. My IH tractors (3414, B275, and B414) all have Ricardo Comet systems. So does my Allis Chalmers ED-40. So does my Deere 2010, Chevy 6.2s and Ford-IH 7.3s.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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