Reciprocating compressors use pistons driven by a crankshaft. A forged crankshaft, lighter pistons and strengthened connecting rods aid durability. The Methanol-fuelled engine used a steel crankshaft and aluminium alloy pistons. They feature sodium-filled exhaust valves, a cast steel crankshaft, and a spheroidal graphite flywheel. It was fitted with a stroke crankshaft and the cylinder bore diameter was . The engine rotor rotates at 1/3 the speed of the crankshaft. Also the crankshaft and connecting rod bearings may seize. However, gears and shafts constrain the relative location of the crankshaft and camshafts. The connecting rods were in diameter attached to bearings on the crankshaft. It was the product of placing the stroke crankshaft into a bore cylinder-block. The engine used a cast nodular iron crankshaft and external balancer. The intake stroke and compression stroke require one rotation of the engine crankshaft. The engine utilized a bore and a flat plane stroke crankshaft. The primary internal changes are a 40 percent heavier crankshaft and revised balance shaft. It has a forged steel crankshaft and cast connecting rods.