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Theuse of a wet or dry sump oiling system is often determined by the levelof competition and the racer’s budget. A wet sump system is based onthe original equipment oiling system, and can be enhanced with certaincomponents to improve oil control and increase power. A dry sump systemis designed for the top levels of racing where maximum power and oilcontrol are absolutely essential.

Oil Pan Capacities

typical wet sump oiling system.Capacitieslisted for Moroso Wet Sump Oil Pans include the capacity of the panonly, measured at or below the normal fill mark on a stock dipstick.Additional oil must be added to compensate for filters, coolers, tanks,etc.

Unlikea wet sump system where oil is stored in the pan, a Dry Sump Oilingsystem stores oil in a separate tank — leaving the pan essentially"dry." An externally-mounted pump, generally with three or four stages,is used to "scavenge" or remove oil from the pan, deliver it to thestorage tank, and send it back through the engine. In a typical setup,all but one of the stages is used to scavenge oil from the pan. Asingle pressure stage is normally used to return oil from the tank tothe engine.

Typical dry sump oiling system.The primary advantageof a dry sump system is its ability to make more power. With verylittle oil in the pan, the rotating assembly is not burdened with theweight of excess oil (a phenomenon commonly referred to as "windage").And because there is no internal pump, the windage tray or screen whichserves to isolate sump oil from the rotating assembly, is allowed torun the full length of the pan. Keeping the rotating assembly free ofwindage allows it to spin freely and make morepower. In addition, the extra crankcase vacuum created by the dry sumppump helps to improve ring seal for additional power gain.

Otheradvantages of a dry sump system include increased oil capacity, moreconsistent oil pressure, the ability to easily add remote coolers, andadjustable oil pressure. And because the pan doesn’t store oil, it canbe relatively shallow in depth to allow lower engine placement forimproved weight distribution and handling.

Morosomanufactures a full range of Dry Sump Oiling System components, all ofwhich are engineered to be fully compatible with one another. Thisallows the engine builder to select the best combination of equipmentand avoid the costly problems that often occur when "mixing andmatching" components from various manufacturers.

Note:Oil pan rules vary from track to track. Check with your race trackand/or sanctioning body before selecting your Moroso Oil Pan.

Tech Tip courtesy of Moroso. 

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Engine Builder Staff

Engine Builder Staff

Engine Builder Staff

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