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Flat Plane Vs Cross Plane V8 engines. A flat plane V8 (animated on the left) is very much like two inline-4 engines mated together in a V configuration. Therefore end-to-end balance is inherent, as the first and last piston of a bank is always exactly in the same position, as are the center two pistons on each bank.
Straight engine - Aviation use. 1  In aviation, the term inline engine is used more broadly, for any non-radial reciprocating engine. [2] 2  Some straight engines, in the strict sense, have been produced for aircraft. 3  In motorcycling, the term in-line is sometimes used narrowly, for a straight engine mounted in line with the frame.