Variable Oil Pressure

[Jak]

I have always had a steady 50psi on my gauge, however in the last couple of days I have noticed a change.
From start-up I get 50psi, but when the engine warms up I get a dip and rise in pressure which seems to follow the engine revs.
When idle in traffic it drops to about 30psi and rises quickly up to 60psi when moving rapidly, settling back to 50psi when cruising
Anyone got any ideas what could be causing this - I have checked the oil (if anything I have too much in).

[salty]

My 4.5 has always behaved like yours does now. Starts about 50+ when cold. Once the engine has warmed up, it drops to about 20psi at idle, and rises as the engine speed does.

I thought that was normal operation. Isn't it?

Paul

>> Edited by salty on Thursday 25th April 09:37

[jurdy]

Perfectly normal behaviour.

[gazzab]

Mine is 60 psi from cold, drops to 40 psi when hot and idling and then about 50 when revs pick up.

[Jak]

So was mine faulty before - sitting at a constant 50psi?

[fraser]

It depends on the following- how old is the oil (cos oil can lose viscosity and hence pressure will fall) how old is the oil pressure spring(when these tire and eventually break psi can drop alarmingly quickly(mine went from 50 mid to 20 mid in the space of 2 seconds on the way back frpom Elvington(a new spring gave a pressure of 70 mid !!!) and of course it depends on quirks too. Once your oil heats up pressure tends to fall by 5-10 psi anyway and the quirky guage can sometimes read 45-50 but if i flick it (read smack it !!) oil pressure comes back to 60 mid.....as long as there is enough oil in the engine and the pump is working (you will know if it isn't as the power steering will not work either cos the shaft has snapped or seized) then you have problems. My advice. Get the oil pressure relief spring checked.If your oil is old change it.If all of these things are ok and TVR have checked it all just flick the guage and see if it is a guage quirk.....if none of the above make any difference then it is 'normal' and they all do that-

[VENOM500]

Sound Perfect to me ,infact better than my Cerbera ever had,recon you should chill,nothing to worry about.