Hi .... so what should approx oil pressure be on a uprated 4wd oilpump ??

Thing is that I ordered a uprated pump where I got my engine rebuild, but I think it a bit low ..?

idle .............. 55 psi cold and 28 psi hot
2000 rpm ..... 40 psi hot
3000 rpm ..... 48 psi hot
raising to approx 52-55 psi hot when taking higher rpm's.

I dont know if it matters, but I have a external oilcooler mounted and i'm using a mobil 1 oil, (5w50) ??????

 

hmm.. same as mine! Hope it is ok. I think my pump is standard!

 

JAN : well...if its std it should be around these figures....but as you know ...Entech did my engine and they where told to mount a HP oil pump...and looking at these figures ...well ... I think that something is not as it shold be....

so please anyone...have a look at this, and let me know what you think....

 

i have nearly 80 psi when stone cold and over 60 when hot and over 4k revs.

 

and that is on a uprated pump...??

if so it Looks like something is not ok in my case...

 

what grade of oil are you using? as this can have an affect also!

mine with 10/60 Millers from cold 75psi dropping to 60psi when warm(at full throttle) 45psi on tick over!

 

I dont know if it matters, but I have a external oilcooler mounted and i'm using a mobil 1 oil, (5w50) ??????

 

thats about 20 psi higher than mine from cold and 20 psi over at idle when hot ...

I dont know if it matters, but I have a external oilcooler mounted and i'm using a mobil 1 oil, (5w50) ??????

 

the external cooler wil make the oil pump work harder but should effect overall pressure i dont think..

mine is a 4x4 modified pump from mountune

 

mine is up about 5psi on these figures, new standard pump on new bearings regrond crank etc

 

ok...mine is also a 4wd pump, and should be with a uprated spring .... buuut it looks like that either they "forgot" it or there is another problem.....

 

hmmm..sound like I only got at std pump ...but payed for a uprated

I also got new bearings and so on as it was a complete rebuild... ....

so if there was another problem...what could that be ??

 

Tom those figures are for a std pump mate BUT as alvyn said oil grade makes a difference

an uprated pump should be around 80 psi cold

But it is not such a good idea to have too much pressure,because all the oil gose to the top quickly and only has a hole the size of 22 mm approx to return to the sump= bottom end failure if low on oil

These are mine 60 psi cold
32 psi hot at idle
this is on mobil 1 motorsport 15/50

I personally think your oil is too thin
BUT your figures are in spec

 

thanks...about the oil.. I used the old mob 1 , 5-40 the first 6 years I had the cossie...then I went to gastrol RS 10/60....but after a couplen of years I was told that it was to thick, so I found this mob 1 oil 5/50 and "Oilman" from PF told me it was ok as long as I changed it regulary..and I do...at about 4-5000 km, but yes pressure dropped a bit when I changed it....

About the pump...its just that I cant understand why it has std pressure when the pump is a uprated(I got it myself from Woodford)....could anything be wrong... the engine is a 4wd rebuild only change is that its in my 2wd sapp, and therefor it has a 2wd sump...???

 

Pick up pipe too close to bottom of sump restricting flow and what dip stick are you using??????

 

hmm... could be...how do I find out ?? And if so how can I solve the problem ?

Its a complete 4wd engine, except for the sump ... so dip stick is 4wd.

why ??

 

Right dip stick will read wrong as its a different size and different markings on it to a 2wd item, i believe that the 4wd oil pump and pick up sits lower than the 2wd item u will need to comfirm this with a tuner ask stu @msd or mark @madevelopments or someone on here will no for deffo....

needs to be sorted

 

Ok..I'll ask right away !!!!

 

did a peak recal on my oil pressure and i have seen 80 psi at one point...

maybe when its revved to 8k

 

so thats 80 psi most of the time then Euan

Fair play give it some

 

very rarley gets revved right out in each gear...

dont really need too.

that peak recall was from daddy thrash i think which would have seen 8k in 4th then well over 7k in 5th

 

hi..just checked the gab .... on my old 2wd engine the p/up to sump looks like about 10 mm and when looking at my 4wd engine with 2wd sump, it looks like the gab is about 5-6 mm ..... so would that be ok ??

if so the pump must be a std 4wd pump... or there is another problem.. ...... ???

 

The grade of oil is vey important, i had oil from a mate who works at BMW and my oil pressure went to 40psi when cold and dropped to as low as 12.5psi when really hot, i shit my pants and changed to mobil 1 15/50 and it read 60 when cold and 33 when hot, i only have a standard pump too

hope this helps a little

 

ok...I have found a Q8 fully syntectic 10w50 oil and I will try it when I get my car back on the road in mar/april ...then we'll see..

 

Had 80 when i start engine and when hot after a run its sits around 35sih

Dont have a clue what pumps in there though