Oil Pressure Relief Valve Porting

[BoostedAWD91]

I know there is some threads about this already but i couldnt find the exact answer i was looking for. How much do u wanna expand the hole? Is there a measurement i could go by? My oil pressure is way to high and need to port this and i dont wanna over port it and then not have enough pressure.

 

[CarRacer]

GVR4 Link.

I was looking at this earlier today.

 

[ktmrider]

Another good link from Tooners click
Look at post #89.

 

[SleepinGVR4]

I hope you don't plan on porting the water cooled OFH.

 

[BoostedAWD91]

Yes i am

 

[PreskitVR4]

I have never seen this done on anything but a '90 OFH, could be wrong though

 

[The_Big_Weave]

Are you trying to lower the pressure? i heard that you just cut the spring.

 

[PreskitVR4]

porting is common practice, cutting the spring sounds scary if you cut too much you cant put it back. besides isnt that spring for the oil t-stat to the cooler?

 

[SleepinGVR4]

People have cut the spring in extreme conditions and only as a last resort. No one ports the water cooled OFH. The filter has a tendency to back off. Get a 90 OFH and port that. And who says your oil pressure is to high for the stock water cooled OFH?

 

[ktmrider]

Sleepin and Preskit, what are you guys talking about?!?
Porting the pressure bypass orifice is somewhat common after deleting the balance shafts and/or oil squirters. Deleting either of the two items can cause the oil pressure to spike well over 100psi when cold and run 70-100psi even when warm. It's been know to damage seals in both the motor and BB turbos.
The link I posted above shows the general shape ( gumdrop ) and how far to do it. Edit, changed the link slide to #89, it shows an unported orifice and how to trim it.
Cutting the spring is dangerous as you have to shim it to prevent the bypass piston from opening too much.

 

[BoostedAWD91]

+1
i wouldnt cut the spring. porting the relief valve port can be done on any of the housings

 

Porting it is a very simple procedure. It worked perfectly for me. DO NOT CUT THE SPRING. I just took my time and filed it by hand just like the pic in the link. A "gumdrop" or "D" shape right to the edge where the piston seals.

 

[SleepinGVR4]

Quoting ktmrider:
Sleepin and Preskit, what are you guys talking about?!?
Porting the pressure bypass orifice is somewhat common after deleting the balance shafts and/or oil squirters. Deleting either of the two items can cause the oil pressure to spike well over 100psi when cold and run 70-100psi even when warm. It's been know to damage seals in both the motor and BB turbos.
The link I posted above shows the general shape ( gumdrop ) and how far to do it. Edit, changed the link slide to #89, it shows an unported orifice and how to trim it.
Cutting the spring is dangerous as you have to shim it to prevent the bypass piston from opening too much.



I forgot the BS were removed from Chris's motor. I have the BS removed and the OFH ported and my oil pressure gets up to 70psi sometimes. So now what?

 

[BoostedAWD91]

im getting up to 120 before operating temp at like 3k rpm

 

[SleepinGVR4]

OK thats a little worse than mine

 

70 psi at redline should be normal. 120 on the other hand is too much. I have 10 at idle and 70-80 at redline.

 

[SleepinGVR4]

OK I feel a little better.

 

Is this too much? I finally ported mine and think I may have taken out my VR4 aggression on the poor opening. /ubbthreads/images/graemlins/laugh.gif







How's she look?

 

[brisvr4]

To me it looks like you may have ported it a little too much. See how it is opened up past where the piston seals.I guess you could try it and keep a very good eye on your oil pressure?

 

ive just did a bsek on my 6 bolt, will i have to port the housing????