Show whole topic Nov 20, 2019 2:57 pm
Mark Offline
Member
Registered since: Feb 05, 2009
Location: Worcestershire


Subject: Re: 2ltr oil pump and pressure
I have found the recent comments on oil pressure most interesting.
Our much missed friend John Batt rebuilt my 2 Litre engine around 10 years ago. It had new white metal mains and Arrow rods with shells. The oil supply from the pump goes through a discretely placed modern canister filter prior to entering the centre main. The oil pump was rebuilt a few years earlier,
About 5 or 6 years ago I took Tims advice and fitted a non return valve low down on the pick up pipe from the sump. This latter item has been a huge success. As Tim says, almost instant oil pressure on start up.
However, I still have very low oil pressure once hot and running at 40mph. On cold start up it is right up there at 40-60psi but settles down to 10-12psi at normal road speed once the engine is thoroughly warmed through and less than 5psi at idle. The relief valve is screwed fully down
Now I would welcome any thoughts on things to check in addition to the supply pipe to gauge mentioned by Peter.
One thing John said to me a few years ago was about the bronze oil distribution block. He hypothesised that the bore of the oil way to the timing chains within the bronze block might be a source of low oil pressure when hot?
John said he had never investigated this as a problem put wondered if reducing the bore of the oil way to the timing chains would overcome oil pressure loss if it were occurring at that point? If I recall correctly John said to me the timing chain oilway is the first call on oil from the pump.
I would be most interested in any comments on the above
Best regards
Mark