What is the oil pressure from the HEAD ???

[andy4g63]

As the title states, I want to know:

What is the oil pressure from the head??? [ in PSI...]
-Accurate answers only, please. My motor does not have balance shafts, not sure about oil squirters.
-Basically at idle and WOT / going thru the RPM's/

-Thanks for your time.

 

[MichaelSuch]

On a site I read at idle its can be as low as 5 psi, let me try and find the link, just seen it the other day.

Found the site: Forced Performance Turbochargers

About 1/4 of the page down

 

[need2boostpsi]

that's also with balance shafts, removing balance shafts will increase your oil pressure, i would love for someone with actual results to post, very interested in the outcome.

 

[tsiAWD91x]

hey bud reading from a autometer mech gage with ballance shafts removed and not porting my oilfilter housing im getting 12psi at 750rpm warmed up and 60psi at 3200rpm and about 100psi or alttle more by 7k. As far as the head feed i kno that its the last place basically from the system the oil is getting to after filteration. I know this DOSNT completely answer your question but might give you and idea unless someone has actuall tried it i would guess Hoset turbo users would be able to give best imput

 

[need2boostpsi]

100psi to a holset would send oil into your intercooler pipes pretty quick, around 30-40psi is what holset turbo's like to see under load.

 

[99gst_racer]

hey bud reading from a autometer mech gage with ballance shafts removed and not porting my oilfilter housing im getting 12psi at 750rpm warmed up and 60psi at 3200rpm and about 100psi or alttle more by 7k. As far as the head feed i kno that its the last place basically from the system the oil is getting to after filteration. I know this DOSNT completely answer your question but might give you and idea unless someone has actuall tried it i would guess Hoset turbo users would be able to give best imput

And you measured these pressures from where? Head or filter housing?

 

[JusMX141]

As far as the head feed i kno that its the last place basically from the system the oil is getting to after filteration.

It's not like the oil at the head is scavenged from the rest of the engine and then pumped to your turbo unfiltered....it's not dirty oil. The oil at the head is just as clean as the oil at the filter housing....if it wasn't, we'd destroy cam journals on a regular basis.

The turbo's oil fitting at the passenger's side front corner of the head is 1/2" from where the oil enters the head from the block. The passage in the block leading to the head comes directly from the oil pump....so at the very most you're seeing slightly less oil pressure at the head and that's it.

 

[andy4g63]

Thanks for the replies, people. Just going to wait a little more, to see.Thanks, again.

 

[dsm-onster]

The passage in the block leading to the head comes directly from the oil pump....so at the very most you're seeing slightly less oil pressure at the head and that's it.

Good point. I never looked at it like that. . .

 

[turbotalon1g]

I am also interested in this.

 

[dsmtalontsi95]

still no answer to this question, I too am interested?

 

[KJS1820]

I am curious too! I just measured mine and see 10-12 psi (idle 950rpm) at the head feed! up to 4500 rpm I see about 30 psi! at the of housing I see 30 at idle and almost 70 at 4500 rpm Oh I have no bal shafts and have oil suirters ina 6 bolt 2.3 oe bearing clearances

 

[Zex4g63]

The turbo's oil fitting at the passenger's side front corner of the head is 1/2" from where the oil enters the head from the block. The passage in the block leading to the head comes directly from the oil pump....so at the very most you're seeing slightly less oil pressure at the head and that's it.

Just to clarify. When the oil enters the head, it goes into the restrictor plate before entering the galley that feeds the cam journals and turbo feed line. The restrictor plate also feeds the two lifter galleys seperate from that galley. If your having issues with oil volume/pressure due to balance shaft removal, squirter removal, or too tight bearing clearances the restrictor plate can be modifed to remedy it. Just have to use your brain a little.

 

[babyviper]

I have installed a mechanical oil pressure gauge on the head of a bone stock 7-bolt motor and it was getting around 9psi at idle and 30-40psi max even at redline. The oil pressure reaches 30-40 at 3500rpm and stays the same all the way to redline. I have also tested it on a bone stock N/T 6-bolt it does the same thing. BTW stock oil pressure at the OFH is exactly how tsiAWD91x descried it when warmed up.

 

[twicks69]

Andy, this is the most information I could find that was accurate, and by a guy who knows his stuff when it comes to valvetrain (and a helluva lot more!)

http://www.kigglyracing.com/parts/images/Oil_Pressure_new_regulator_noted.png

Information was found on his HLA part page at: Kiggly Racing - kigglyracing.com

 

[rtincher22085]

Is there a how to on this modification to the restrictor plate to increase oil pressure in the head. I to have my balance shafts removed and still have my oil squirters installed and seems like I'm not getting enough volume to my head and I have 3g revised lifters. any help with this would be awesome. Is it a good idea to bore out the 1g rocker holes to accomidate the 3g lifters seeing they are still pin hole sized?

 

[chanley talon]

I have the same issue as the guy above me? I just dont seem to have enough oil pressure in the head and i would like to modify any restrictor i can without removing my head.

 

[simple jake]

I've thought about putting an oil pressure sensor at the head to see what the oil pressure is. Does anyone know the size of the oil ports on the passenger side of the head?

 

[JusMX141]

Is there a how to on this modification to the restrictor plate to increase oil pressure in the head. I to have my balance shafts removed and still have my oil squirters installed and seems like I'm not getting enough volume to my head and I have 3g revised lifters. any help with this would be awesome. Is it a good idea to bore out the 1g rocker holes to accomidate the 3g lifters seeing they are still pin hole sized?

You have (16) lifters with holes roughly ten times larger than the stock lifters- obviously this is going to lower the available pressure and volume for other components sourced at the head.

I honestly believe this is the reason the factory head-fed MHI turbos are restricted in the line- not to necessarily change the pressure at the turbo, but to verify that the head itself is not drained of available oil for the cams and valve train.

Any time you install a turbo like a Garrett T3 at the head with a 360* thrust plate having large oiling holes, it's lowering the available oil pressure for the valve train and lowering the available pressure for the turbo as well. Depending on what the pressure was when you started, this could be fatal for the turbo and head alike....which is why we say you MUST verify pressure at any source when adding an aftermarket turbo- don't just do something because someone else is doing it because every engine is drastically different.

 

[ziggo0]

As I understand it, that restrictor plate in the head should regulate the oil pressure in the head to 35 ~ 40psi.

 

[Leonthefaded]

Sorry to bring this from "ye olden days"

I've connected an AEM Digital Oil Pressure gauge to my 7 bolt head and from its readings I've seen a max of 40 psi for my oil pressure. Can this be an accurate mesasurement of my oil pressure? or is there a fair percentage of drop because of the location of which I'm reading?