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Oil pressure VS RPM #1634193
25/07/2019 20:56
25/07/2019 20:56
Joined: Dec 2007
Posts: 2,251
Windsor/ Reading
knight7660 Offline OP
Club Member 1779
knight7660  Offline OP
Club Member 1779
Competition Level

Joined: Dec 2007
Posts: 2,251
Windsor/ Reading
Evening all out of interest is there a pressure relief valve (PRV) on the 20vt engine which opens higher up the rev range. Im in the process of running the latest engine in and i just want to keep an eye on the oil as the rpm is raised.

I dont want to wined it up to say 7500rpm and freak out because oil pressure hasn't risen above 60PSI because its not needed and the PRV is open.

Any info would be great


LE53 (452BHp & 389ftlb's with Quaife)
Wine red VIS FOOFY
Audi RS4 B7
Re: Oil pressure VS RPM [Re: knight7660] #1634195
25/07/2019 22:52
25/07/2019 22:52
Joined: Dec 2005
Posts: 3,726
Pothole City
GrahamL Offline
Forum is my job
GrahamL  Offline
Forum is my job

Joined: Dec 2005
Posts: 3,726
Pothole City
Yes there's a PRV in the oil pump that passes oil back to the sump rather than out to the filter. The value isn't specified.

Re: Oil pressure VS RPM [Re: knight7660] #1634224
27/07/2019 06:50
27/07/2019 06:50
Joined: Apr 2011
Posts: 350
England, Devon
lost55 Offline
Making a profit
lost55  Offline
Making a profit

Joined: Apr 2011
Posts: 350
England, Devon
There's a spring and plunger prv on the side of the oil pump.
Its there for cold start when the oil and engine are cold. Pressure would be around 90 to 100psig if it was stuck closed.
60psig is around 4 barg which is ok

Re: Oil pressure VS RPM [Re: knight7660] #1637625
17/12/2019 18:44
17/12/2019 18:44
Joined: Dec 2007
Posts: 2,251
Windsor/ Reading
knight7660 Offline OP
Club Member 1779
knight7660  Offline OP
Club Member 1779
Competition Level

Joined: Dec 2007
Posts: 2,251
Windsor/ Reading
From what i have read you need between 10-20 PSI of oil pressure per 1K rpm, I see around 65 psi (hot) on tick over and 95 psi at 7k rpm so i think oil pressure is fine for my needs.


LE53 (452BHp & 389ftlb's with Quaife)
Wine red VIS FOOFY
Audi RS4 B7

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