Engine Oil Pump
Moroso 63859 Dry Sump and Vacuum Pump Drive Mandrel Kit for Small Block Chevy
Moroso 22185 High Volume Oil Pump and Pickup Assembly Big Block Chevy 8 Inch Pan
Moroso 22134 High Volume Oil Pump and Pickup Package Small Block Chevy
What Is an Engine Oil Pump and Why Does It Matter?
The engine oil pump is one of the most critical components inside any internal combustion engine. Driven by the crankshaft or camshaft, it draws oil from the sump and pressurizes it, pushing it through the engine's oil galleries to lubricate bearings, camshafts, pistons, and valve train components. Without a properly functioning oil pump, metal-on-metal contact can occur within seconds — causing catastrophic engine damage that no amount of fresh oil can prevent.
Oil pumps come in several designs — gear-type, gerotor, and vane pumps being the most common. Each design has strengths depending on the application: high-revving performance engines often demand gerotor-style pumps with tight tolerances and elevated flow rates, while diesel work trucks may rely on high-pressure axial piston pumps to serve both the lubrication and fuel injection systems simultaneously.
When to Replace Your Engine Oil Pump
Oil pump wear is gradual, but warning signs include a persistent low oil pressure warning light, a noisy valvetrain (especially at idle), or visible oil starvation marks on engine bearings during a rebuild. During any major engine overhaul, replacing the oil pump is considered best practice — the cost of a new pump is trivial compared to a spun bearing or scored crankshaft journal. For performance builds or high-mileage engines, an upgraded pump can provide a meaningful increase in oil volume delivery and pressure stability under load.
Choosing the Right Oil Pump
When shopping for a replacement or performance oil pump, fitment accuracy is paramount. Always verify compatibility by engine family, displacement, and model year. For standard replacements, OEM-specification pumps restore factory oil pressure and flow characteristics. For performance applications — forced induction builds, high-RPM engines, or heavily modified street motors — high-volume or high-pressure variants can provide the extra lubrication headroom that aggressive driving demands.
Top Engine Oil Pump Brands
S&S Cycle is a legendary name in American V-twin performance, with roots going back to 1958 and a reputation as one of the most respected sources of Harley-Davidson engine components. Their oil pump kits for Big Twin and Milwaukee-Eight engines are precision-machined from billet aluminum and engineered to significantly increase oil flow over stock, making them a go-to upgrade for riders pushing their engines hard.
Bostech Fuel is a specialist in diesel engine oil systems, particularly high-pressure oil pumps (HPOPs) for Ford Power Stroke and Detroit Diesel applications. Their HPOPs are built to exact OE specifications and backed by a 24-month unlimited mileage warranty, making them a trusted choice for Power Stroke 7.3L and 6.0L owners dealing with fuel injection and oil pressure issues.
ACL Bearings brings the same precision and engineering that earned their race-series engine bearings a global reputation to their Orbit line of performance oil pumps. Featuring gerotor sets precision-machined from steel-copper alloy, ACL oil pumps are individually inspected and tested, and are available for popular Honda/Acura and Subaru performance platforms.