Quincy QRNG Slow speed operation requires less maintenance, produces more CFM per horsepower Valve design helps QRNG run efficiently at lower temperatures Lubricating system features advanced-design gerotor oil pump and heavy-duty oil filter for improved life and reliability Fully counterweighted ductile iron crankshaft, precision-ground to .0002" roundness Crankshaft and connecting rods are rifle drilled to assure positive pressure lubrication to all critical wear areas Heavy-duty disc-type valves with Swedish steel discs, cast iron bumpers and seats for long life Rebuildable high-strength aluminum alloy connecting rods equipped with replaceable automotive-type inserts Piston pin needle bearings for strength and long life Crankshaft ends are supported by large Timken tapered roller main bearings to withstand radial and thrust loads Large fan-type pulley for smooth running and efficient heat dissipation Circular finned intercooler further increases heat dissipation for higher efficiency and longer life