Very High Oil pressure ( Fresh Motor )

[AwdTn]

Alright guys I have been scratchi9ng my head for months on this one. I rebuilt my 92 talon about 2-3 yrs ago. This was the second rebuild within a few months the first one was ruined about 3k miles into it by a turbo that went bad and caused my oil pump to fail. Need less to say I was quite frustrated after the first mishap and decided to pay to have it all assembled by a local machine shop with a very good reputation in performance cars.

When the car was being rebuilt i ordered autometer oil pressure gauge amd installed it. Once I got the motor in and started it I saw that it had very high oil pressure. On the first start up it spiked to 100 psi ( the top of the meteres range) and stayed there till the car dropped off to a normal idle where it fail to about 50 psi. Which seemed rather high to me but since the whole time before I had just the stock gauge to go by wasnt sure what was "normal".

Now I am 1K miles in on the motor and afarid to even drive it at all. The oil pressure is still very high right after start up and spikes to 100 pegging my gauge under any boost. Recently one of the lifters which are fresh as well start tapping kinda loud. So I parked the car frustrated as can be and swore Id never put another dollar into the car again. 3 yrs later my frustration is gone and I still havent been able to make since of the issue. I seriously doubt the machine shop will take my word for it I havent got but 1k miles on the build. So I need some help figuring out where the right place to start looking would be.

I have removed the oil relief valve and ported it but I have not replaced it yet cause i switched to a 90 model housing and waiting on my oil cooler and ifftings to arrive.

The car has had both balance shafts removed with a kit as well as 1g rods with 2g pistons. I replaced the factory turbo with a Evo 3 Big 16g. Other then that the motor is stock.

I really need your guys help.

 

[94_TSi]

I believe this is all due to removing the balance shafts. On the last motor i built on the stock gauge it ran well over midway and continued this for about 2 weeks. Then dropped off to where it ran before the rebuild.

 

[AwdTn]

So more or less your suggesting that I just let it ride and see what happens? I am honestly terrified of another engine failure.

 

[LiquidX]

My fresh rebuild was hitting 40psi at idle and went above 80psi (gauge max). I haven't checked it again yet however. This was even with a ported OFH which it seems I'll need to take another go at.

 

[AwdTn]

What is the normal pressure range for a fresh build where should I start to get worried?

 

[Bluefire16]

Well with a fresh build, you should be changing the oil quite often, so after some time i would belive it to drop. However, it could just be the sending unit. Mine was reading about 25psi OFF. I thought my engine was running very high, so i called and had them send me a new unit, sure enough the unit itself was off. Sometimes the vibration from the motor can damage the sending unit.

 

[JusMX141]

This was the second rebuild within a few months the first one was ruined about 3k miles into it by a turbo that went bad and caused my oil pump to fail.

Don't you have that backwards? I can't see how a blown turbo would cause your oil pump to fail.


If you're trying to cure high oil pressure, try thinner oil or even trimming the spring in the pressure relief valve a little at a time until the pressure is where you want it to be.

 

[BrokenTsi]

Are you sure you have the right sending unit for that gauge? 0-100psi? Do you have oil squirters in your engine?

 

[TsiDan]

i removed the balance shafts with my build and my oil pressure is really high as well.. with just 5 quarts of heavy 15-40 oil in it (brake in) my stock gauge is at 3/4 of the way and sometimes higher. id say its fine but then again i dont have as many miles on my build as you do..

 

[BogusSVO]

what are the clearances set? for the rods? for the mains?

what is your head thickness?

there is an oil passage that goes from the block into the head, if the head is "thin" then that passage becomes small and will not flow as much oil as it should....

http://www.dsmtuners.com/forums/newbie-forum/341028-4g63t-head-oil-port-mod.html

this mod should help drop the pressure a bit and increase oil flow to the head (and turbo if the oil feed is from the side of the head)

remember oil pressure (and boost ) is a measure of the force needed to go past a restriction.

 

[AwdTn]

I dont remember the exact specs on the bearings the machine shop just ordered the proper sizes to put them into spec(Its been 3 yrs). The head is also stock thickness I did not have it shaved.

I do have Oil squirters the short block I used from a 90 model tsi.

From what I could tell one of the bearings had failed in my old turbo and put metal flake in the oil which chewed the gears of my oil pump very badly.

The oil passage port is very interesting and I will deff take that under advisement.


Thanks a ton for all your guys help so far keep em coming

 

[BrokenTsi]

I dont see how anything large enough to pass thru the oil pick up can get into your gears and ruin them honestly......

On an engine with oil squirters, I dont see how your oil pressure can actually be as high as you say it is. Even with balance shafts removed. I would try a new oil sending unit for that autometer gauge. Is the needle at 0 with the ignition off?

I used to have a built engine with oil squirters, no balance shafts, and the relief port was never ported. It would peg the oil gauge at high rpms, but it would never idle at 100psi like yours.

 

[JusMX141]

From what I could tell one of the bearings had failed in my old turbo and put metal flake in the oil which chewed the gears of my oil pump very badly.

The #1 killer of oil pumps is running your timing belt too tight.

The #2 killer of oil pumps is using a TopLine front case / pump assembly. I've seen these fail in as little as 60 miles with proper tension on the belt.



With that in mind....

The #1 killer of turbos that are not overboosted and given the proper oil pressure and drainage is metal in the oil from a failed oil pump and / or engine bearings.

 

[AwdTn]

Ok I will get a new sending unit and try the relief valve i have ported and report back. thanks for all the help

 

[Bluefire16]

Good luck (im guessing the vibrations have killed it, like i said before) so let us no how it goes after you get a new one. Oh and also, tell them it just seems off and see if you can get a replacement for free

 

[Hubbell91Tsi]

my old engine would see 130psi cold. be lucky to see 40 on a hot idle. would be right around 80psi cruising at 60