Show whole topic Feb 29, 2008 6:23 pm
Registered since: Jan 17, 2008
Location: -


Subject: Re: Oil pressure fluctuating...
Dear John & Don,

I have had a similar problem. On my original engine, without modern oil filter, the pressure would go up to 45, and cut off, then settle to 25-35 when hot (down to 20 when very hot). The bearings are all OK and the engine has done about 60k miles since last rebuilt. I have put another rebuilt engine in the car with a full flow filter, this goes off the dial when cold despite fitting a weaker relief valve spring, then settles down to 25-35 when hot. I also had to fit a non-return valve as the oil would not pick up (even after priming the pump). I never had this trouble with the original engine. Maybe the pressure has something to do with the filter, although I'm not sure what. The filter has to be done up really tight, otherwise the seal leaks slightly. The engine now in the car has shell bearings whereas the original's are metalled. Doen't help you, but you're not alone! Lets hope we are not building up trouble. Kind regards, Roger