The two inside crankshaft journals are also 180 degrees apart. The front and rear journals are set at 90 degrees to the two center journals. A crossplane crankshaft has the front and rear crankshaft journals oriented in opposite positions, 180 degrees apart. In search of a smoother V8, Cadillac and Peerless developed the crossplane crankshaft, first introduced by Cadillac in 1923 and Peerless in 1924. Also like a 4-cylinder engine, the flat plane V8s are prone to vibration. The front and rear journals are completely opposite in position to the two center journals, forming a flat plane. Like a 4-cylinder engine, there are four crankshaft journals set 180 degrees apart. This looks like two four cylinder engines that have been joined together at the crankshaft. The earliest V8 engines used flat plane crankshafts. In the early 1920s, Cadillac and Peerless pioneered the smoother crossplane crankshaft, a design that revolutionized the American V8. ![]() ![]() While V8 engines have been around since the beginning of the 20th century, the earliest iterations used a flat plane crankshaft, making them fundamentally different and rougher running than most of today’s V8s. The V8 has long been a symbol of power, performance and smoothness, but this wasn’t always the case. It was the engine that dominated the North American automotive landscape from the 1950s to the end of the 1970s.
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