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you only need a single stage pump unless your going to go the dry sump route.

a pump from BDG, Peterson, Weaver will give you good results.

oil pressure you'll need to talk to ur engine builder to see what he wants to see but i know the BDG pumps are adjustable from 10-150psi (actual pressure will depend on flow resistance and oil consumption of the engine). external oil pumps flow a massive amount of oil compared to a conventional internal oil pump. fyi the BDG pump flows 42cc/pump revolution so at 2000rpm engine speed with 2:1 reduction, pump does 1000rpm and delivers 42l/min. compared to std rb26 pump 15.2l/min and jun 19.5l/min both at 2000rpm (std and jun figures pulled from the jun website)

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