Dry sump system
This system is employed in some racing car engines for situations where the vehicle has to be operated at very steep angles, for example, sports cars, jeeps etc. if ordinary pressure system of lubrication is used in such cases, the situations may arise when there is no oil at the place where oil pump is installed. To avoid such instances, dry sump system is used (fig wherein two pumps, instead of one, are used. The scavenge pump A is installed in the crankcase portion which is the lowest. It pumps oil to a separate reservoir B, from where the pressure pump C pumps the oil through filter D, due to the cylinder bearings a full pressure system of lubrication is employed. The oil pressure is maintained at 400-50 kPa for the main and big end bearings while about 5- - 100 kpa pressure is used for timing gears and camshaft bearings etc.
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