Read everything and still high oil pressure

[2soon2]

Ok I had a 91 oil filter housing and oil pressure was fine on aftermarket gauge. It started leaking so swapped to a 90 style. Oil pressure is was high idle is 20psi and 3000rpm its 100psi. So I took it off cleaned it out real good, checked relief spring and piston looked kind of burnt so I bought new ones ported relief hole (since I was in there) to nice big egg shape. Cleaned it up once more and made sure piston moves freely. Put it all back together. Still high pressure same readings. Read that if balance shaft belts is broken it might cause high pressure. Belt is ok. Swapped sending units and gauges and it still reads the same. After a while of pressure like that oil filter starts leaking. Cleaned cooler out (still same pressure) then I by-passed the cooler just incase it wasn't fully clean (still same pressure). Last ditch effort was to port the hole that is on top of the piston and wouldn't you know i still have the same oil pressure. Is there anything else that I can do/check? Need help big time! Whats the difference between the 90 housing and the 91 housing other than the way it cools. Is any of the passages larger or something? Thanks

Well I opened it up and saw the guy before me removed the b/s. I have seen all the pictures and ported my relief hole like it. I have tried different gauges. I have bought new oil bypass piston and spring. Still I havent had the slighest luck of dropping my oil pressure. Can anyone please help?

 

[dsmmatt28]

Cut of one of the coils on the spring. See if that help you might of not ahve ported it out enough.

 

[1992awdlaser]

How did you port the oil relief? It needs to be ported length wise. A new spring won't help. If anything you would want an older spring since it is weaker. This will help the valve open sooner. Personally, I wouldn't cut a coil off of the spring.

 

[2soon2]

Cut of one of the coils on the spring. See if that help you might of not ahve ported it out enough.

I will add this to the list and let ya'll know how it turns out.

How did you port the oil relief? It needs to be ported length wise. A new spring won't help. If anything you would want an older spring since it is weaker. This will help the valve open sooner. Personally, I wouldn't cut a coil off of the spring.

I will find my old one and put it back in. I had a spare housing and 1 is ported like a filled in U like in a picture I saw on this site. The other is shaped like an egg. Neither worked for me.

What kind of oil do you have? Any additives? Maybe you put in to think of oil?

I use 10w 30 with no additives.

Thanks for all the responses.

 

[1992awdlaser]

This is the effective way of doing it. Sounds like you did it this way once though:

 

[2soon2]

This is the effective way of doing it. Sounds like you did it this way once though:

Yep thats how i did it.

 

[jw_55_55]

sorry to hi-jack this thread but im having the same issue but i just did the oil relief port and now i have higher oil pressure than before!! On start-up before porting was done i had 75 psi... now on startup i have over 100!!! so could i have done something wrong to create this problem?? if so how to fix it>?

 

[LiquidGS-T]

I've been looking into this also, I just did a 6-bolt swap. I have the 90 oil housing. I just took it off and ported it today. I didn't have the real pressure gauge on the car, but i could see that the pressure was a little bit lower. I've gone over everything I could think of. Only question I have is what do the high pressure oil pumps ususally run at?

 

[1whitegsx]

im building a 6 bolt right now too. should u always port the oil filter housing if u remove balance shafts?

 

[woooop]

Yes , I just did this and i havent put the filter housing on my car yet but I will tonight so we'll see if I ported it right.Just look at my thread