RaZor Performance -> How it Works

About RaZor

RaZor Pumps

Timing Cover

Pump Rebuilding

Components

How it Works

   1 Stage Schematic
   3 Stage Schematic
   4 Stage Schematic

RaZor FAQ's

Catalog

Racing With RaZor

RaZor Media

Web Links

Contact RaZor

Back to Main

Toll Free:
1 877 GO-RAZOR
(1 877 467-2967)

Single Stage Schematic / 3 Stage Schematic / 4 Stage Schematic

How Does a Dry Sump System Work?

Dry Sump oiling systems are the safest, most dependable oiling systems available. They are popular in all forms of racing, especially where low chassis height is important for good handling. Horsepower gain is maximized because there is virtually no oil in the pan and no internal pump, so the windage tray or screen can run the full length of the pan.

Other advantages of a dry sump system include a remotely mounted oil tank for increased capacity, the ability to easily add remote oil coolers, more consistent oil pressure, adjustable oil pressure, improved scavenging and increased ring seal due to greater pan vacuum.

Multi-Stage Pumps

The three-stage dry sump pump has one pressure section and two scavenge sections, while the four-stage pump has one pressure and three scavenge sections. The pressure section of each feeds oil to the block, while the scavenge sections pull oil from special pickups in the dry sump oil pan. The four-stage dry sump pump is plumbed like the three stage, but the line from the additional scavenge section can be routed to pull excess oil from the lifter valley. This keeps oil from sloshing around in the top of the engine and running down onto the rotating assembly, reducing windage and increasing horsepower. Recently, the need for a five-stage pump with four scavenge stages has arisen for large displacement drag race engines. Razor’s new five-stage pump is capable of creating the higher crankcase vacuum needed by today’s "mountain motors".