Flat plane crank firing order1/11/2024 A flat-plane crank has journals arranged at 180deg to one another, so the crankshaft lies flat on a surface, and looking from the end, resembles the letter I. In a conventional V8, the journals are arranged at 90deg to one another, so looking from the end of the crank, they form a cross, hence the name. Each is shared by a pair of opposite cylinders, like a V-twin. Although there are eight cylinders, the crankshafts have only four crankpins or ‘journals’ to which their pistons are attached by connecting rods. A V8 can be thought of as four V-twin engines joined in a row. What makes the V8 so different to most other engines is that there are two distinct types, and this has to do with the crankshaft design. It’s versatile, too, delivering huge refinement for luxury cars, power for sports cars, muscle cars and racing cars, and shedloads of torque for SUVs and pick-up trucks. Why does the V8 work so well? It has good inherent balance, packs a lot of cylinders into a shorter length and can produce plenty of power and torque, because there are four power strokes for each revolution of the crankshaft, compared with just two in a four-cylinder four-stroke engine and three in a six. If we’re honest about the reason for that, probably 40 per cent of the appeal is down to its power, torque and smoothness, and the other 60 per cent is the glorious sound it makes. Like the straight-six engine, the V8 holds a special place in the hearts of petrolheads.
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