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2011 F150, rebuilding engine 3.5 ecoboost. Engine started

2011 F150 , rebuilding engine...
2011 F150 , rebuilding engine 3.5 ecoboost. Engine started well and ran very smooth. After several minutes run, oil pressure dropped off at idle. Low oil pressure warning comes on, If RPM's increase, pressure returns to normal, but It seems to be losing it on cams, can hear it on top end. Any direction would be greatly appreciated.
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Answered in 8 minutes by:
8/23/2017
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 5,791
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European
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Hello, and thank you for using Just Answer! My name is***** me a few moments to review your question and Ill do my best to assist you.

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Hello, what failed in the engine that required it to be rebuilt? What did you change? new bearing, oil pump? Was the engine sludged up badly? You checked actual oil pressure with a gauge?

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Customer reply replied 3 months ago
Threw a rod, this is new block, pistons , rods & crank, (I built the short block). Original heads and cams. New timing complete. New oil pump

Ok as long as the bottom end is tight it shouldnt loose oil pressure unless there is an issue with bearing clearance or a pressure regulator valve hanging open on the new pump. If its stuck open it can bleed off oil pressure. Otherwise you will need to inspect everything on this build, rod and main clearances with a plastigauge etc. Check for signs of oil passages blocked off if it sounds like its not circulating to the top end of the engine.

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If you need more help please let me know. If I was helpful, please use the 5 stars above to leave a positive rating so I get credit for helping you.

HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
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