bizzarre oil pressure problem

[Rob_B 0]

well ladies and gentlemen, i have some low oil pressure

well i get 1.5 bar at 2000 rpm at 80 degrees on the MFA

this was tested using a capillary oil gauge as used by VW

so far i have changed the pump and all the bearings seem to be ok, no knocking or rattles.

it develops 4bar when cold but this is to be expected as the oil is thick.

as you can see the pressure is low, but not mega low

so if anyone has some suggestions, that would be fantastic

at this rate the warranty on the engine will be out before i get to really use it!!! :roll:

many thanks, Rob

[W3RKD 0]

Did You assemble the engine rob?.. What shells did you use ?

[dr_mat 0]

Does ETKA or bentley manual have any actual *figures* for the correct oil pressures?

Anyone know what they are?

[DierWolf 0]

Should be min 2 bar on idle....

 

Mine just stared doing the exact same thing, actually below 1 bar at idle and at startup its way up at 5 bars.

[dr_mat 0]

Vince says ... (for 'tis he) ... 2 bar at 2000 rpm. Idle pressure can be lower than that.

He doesn't seem to have any documentation to back this up, but I've heard so many slightly different pieces of information about this that I'm beginning to doubt my own sanity..

[Adam Darby 0]

what temp is you oil running at, it get's thinner the hotter it get's don't it, so its not running to too all the time is it, maby the oil cooler is blocked or summit. I think that a mocal oil cooler or something along these lines is better anyway for a constant preassure.

[dr_mat 0]

I dunno what temp it was at when they tested it, I wasn't there.

But see this is the problem. Without a factory book that states: at X degrees C, and Y rpm the oil pressure should be Z bar, you're just guessing aren't ya?

[vr6storm 0]

well going by my 2 different engined Porkers

 

924S 4cyl 2.5 S4 cold idle 5+bar hot idle 1.5-2bar.....guage only reads up to 5bar

993C4 6cyl 3.6 HO6 cold idle 5+bar hot idle 1.5-2bar......guage only reads up to 5bar

 

what I have found with my C is similar figs apart from cold idle being 8+ bar (tho the guage does go up to 10bar)

 

so I would imagine most engines should show similar figs

[Adam Darby 0]

Ill look on mine and see what it run's hot and hot

[Rob_B 0]

used shells from GSF Darren

they are standard size as Mr Werks said the crank hadnt had any material taken off it

the general figure being banded about is 2bar at 2000rpm

idle can be sod all really

some people have mentioned the oil squirters can fail open causing low pressure

im still miffed as to what the problem is

[Rob_B 0]

have i discovered a new corrado problem?!

or are you guys just holding out on me?

[VEEDUBBED 0]

Oil jets failed open??,that's a new 1,i thought those little buggers sprayed oil all the time??

[Rob_B 0]

i think they have a spring inside them which stops them opening before 30psi

i still need to sort this guys, anyone?!?!?!

[Rob_B 0]

well after the massive response, i can reveal the crank bearings are fooked and the crank is scored

this is great, especially as the engine has less than 2000 miles on it.

i also have oil on the spark plugs and some oil and water mixing somewhere.

not sure what ive done to deserve all this. must have pissed someone off

[Crasher 3]

The VW specification is an absolute minimum of 2 bar at 2000 rpm at 80°c using 15w/40 oil. Sorry to read you have scored crank bearings. Did you fit the pump yourself?

[Rob_B 0]

pump was fitted by vw mechanic

im sorry to find them scored, its a nice early birthday present!