mattman1234

Can you have to much oil pressure,and what can happen if there is ?

Daddyn

iTrader: (1)

Did once have a problem on a van splitting filters because the relief valve had jammed. I'd be suprised on a cossie though, it's got piston spray jets like underwater gas pipes What pressure have you got?

tabetha

Yes you can, it robs bhp to start with, causes the oil temperatures to rocket, as it is squeezed more for pressure, which causes it to thin out a lot more, leaks from gaskets become more likely also, oil pumps have been know to explode, but that's mostly the genuine cosworth SHITE they have produced lately!!
Do you have a problem with pressure too high, and how high is high ?
tabetha

Daddyn

iTrader: (1)

Is that non genuine pumps producing too much pressure? or something else causing restriction? What sort of pressure do so called "high pressure pumps" give.
Sorry a bit off subject but like to learn as much as poss

mattman1234

when is cold idle about 65-70psi
hot 25-30psi
4000+rpm 65-70psi
its a genuine cosworth hp oil pump about a year old

Scott_Rst

My escos when first started from cold goes to 5bar, once warm drops to around 3bar,,not sure if thats good or bad,,its always been like that though,

cheers
scott

martysmartie

iTrader: (1)

I get about the same and have a HP pump, the referred to below was Cosworth that had a batch of exploding pumps that were recalled IIRC.

I don't think the pump is everything rather it's down to an engine, I.E the pump creates flow, the engine keeps the pressure, hence why a knackered engine has lower oil pressure but equally could be caused by a bad pump, but say if you put a HP pump on a knackered engine I doubt you will get the pressure you would on an otherwise good engine, thats my thinking anyway.

Martin

tabetha

That's absolutely fine, and actually NOT high pressure, mine is the same, but a 100% bog standard PINTO pump.
The idle pressure when hot isn't so/as important as the pressure by about 2000rpm when load can be applied to the engine, no load at idle, with oil temp around 80C the above are fine, obviously will go down as gets warmer, what oil are you using for those pressures ?
Oddly the ford handbook lists a 30W as best for the yb, but can be seriously harmful, I wouldn't use anything less than a 50 weight personally.
tabetha

mattman1234

I'm using Mobil 1 15w-50

matcossy

hi just to let you no that on my engine from cold it about 60 62psi and when nomal temp its around 25 30 psi i but if iv been killing it down the lanes for a bit its something like 18psi on idle...

gibbo frst

iTrader: (2)

mine is cold start 60-70
after a hard thrash just over 30 tickover
and on the move hot 50-60 .
silkolene pro-s ..
was a little higher readings on mobil 1 though..

tabetha

That's fine oil pressure with that oil grade, need to drive more worry less ha ha!!
tabetha

mattman1234

i agree with you there,I'm just going to leave the bonnet on and drive it

midnight_man

mine is sitting on the top of red when hot....its OK?

I am using Mobil 5W/50 oil. At cold start I have cca 75% of pressure (on gauge).

Thanks

delbee1

Oil's a bit thin, try 10w/50 (Titan Pro S)

midnight_man

Is not possible to buy titan race pro S 10W/50 in our contry ... I dont know why. Google says nothing...

Only 10W/50 fuchs silkolene pro 4 plus 10w-50 but this is for racing motocycles..not for cars

I found only
Q8 Formula F1 10W-50 (4 l)



( API SM/CD, ACEA A3, BMW Special Oil, MB 229.1)

Cossiemainful

iTrader: (1)

10W-50
5W-50

what is too thin?
both are the same.
but the 5W-50 has better protection at cold start, better for the engine.

midnight_man

Are you sure?

Cossiemainful

iTrader: (1)

Well, both have good features, but the datasheet is more important than the numbers. At some points the Mobil 1 is better and in other points the Titan Pro S, but it's wrong to say, an oil is thinner cause of a lower cold visco.