In contrast, the cross-plane V8 makes that famous mellifluous offbeat burble for which muscle cars are known, thanks to an uneven firing order.īut both types make for an intoxicating driving experience, and it will be a sad day when the last V8 rumbles off the line. The flat-plane V8 makes that flat blare typical of V8 supercars and race engines, derived from the fact the engine fires like two screaming four-pots together. The downside is inferior balance (piston pairs move in the same direction, like in a four-pot engine), meaning it’s less smooth. The combination of a lighter crankshaft and superior scavenging in a flat-plane V8 lets it rev higher and so makes more power. With a cross-plane crank, one cylinder can fire after another in the same bank, so unless using a complex design of exhaust manifold, exhaust pulses collide and scavenging is less efficient. This means that exhaust pulses follow one after the other, forming an orderly queue through each exhaust manifold and helping to draw or ‘scavenge’ exhaust from the engine more easily. Why the difference? Flat-plane cranks are lighter and, as the crank journals are at 180deg, the firing order moves sequentially from one cylinder bank to the other: left, right, left, right and so on. Under the skin: Can Porsche's e-fuels completely replace petrol?.In a V8 engine youll be firing each side in sequence. Under the skin: the tyres that maintain pressure automatically The flat plane crank is quite literally flat, when viewed from the side youll see an l shape.Exclusive Rolls-Royce app 'a facilitator' for mega business deals.Under the skin: Could opposed pistons save the combustion engine?.Under the skin: How Toyota will make 'like-for-like' ICEs and EVs.
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