Problem: extremely low oil pressure after engine rebuild. Half to one bar (5 to 15 psi) at idle and maximum of 3 bars (45psi) at WOT.
Engine rebuild details Block sleeved by Dan Benson of Benson Racing. Cyclinders, con rod and crankshaft (Brian Crower) supplied by FXMD. Built by local mechanic. Cometic MLS headgasket and new OEM oil pump with Dali billet oil pump gear. Conrod and main bearings are gapped within service manual specifications (I.e. Around 0.005mm).
What could be the cause of such low oil pressure? Could it be caused by the design of the crankshaft? At recommended oil level, the oil is aerated (noticeable bubble in oil observed on the dipstick). The aeration disappears when we add oil above recommended level. So far we have tried 5/50 and 15/50 oil. We have also ruled out malfunctioning oilmpressure senders. We have manually measured the oil pressure with an external gauge.
Could the problem be caused by a faulty oil pickup?
We have opened up the engine to check and reinstalled it 3 times. So your advice will be much appreciated.
Engine rebuild details Block sleeved by Dan Benson of Benson Racing. Cyclinders, con rod and crankshaft (Brian Crower) supplied by FXMD. Built by local mechanic. Cometic MLS headgasket and new OEM oil pump with Dali billet oil pump gear. Conrod and main bearings are gapped within service manual specifications (I.e. Around 0.005mm).
What could be the cause of such low oil pressure? Could it be caused by the design of the crankshaft? At recommended oil level, the oil is aerated (noticeable bubble in oil observed on the dipstick). The aeration disappears when we add oil above recommended level. So far we have tried 5/50 and 15/50 oil. We have also ruled out malfunctioning oilmpressure senders. We have manually measured the oil pressure with an external gauge.
Could the problem be caused by a faulty oil pickup?
We have opened up the engine to check and reinstalled it 3 times. So your advice will be much appreciated.
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