![]() ![]() It also means cross-plane crankshafts have to use large counterweights to properly balance the engine, helping to keep it from rocking up and down, while keeping rotational mass high, making for a slower-revving engine. Having two consecutive exhaust firings on one bank is what helps give the rumble associated with American V8s, although it makes exhaust scavenging less efficient. There are alternative firing orders, including the 4/7 swap, but none of them get rid of having two pairs of adjacent cylinders firing in succession, pulling an intake charge from the same corner of the intake. ![]() Notice that the cylinders 8 and 4 fire 90 degrees apart and are on the same bank, just as 5 and 7 (which do the same). With this firing order, the odd-numbered cylinders are on the driver side, the even-numbered cylinders are on the passenger side. The tradition V8 firing order used by GM, AMC, and Mopar (and most Ford OHV V8s if the cylinders were numbered similarly) is 1-8-4-3-6-5-7-2. Cross-plane cranks gets their name because when viewed along its axis from either end, the four crank journals are arranged at 90-degree intervals, making a +. ![]()
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