Oil pressure high!
Seem to have really high oil pressure with my newly built motor.
FM 2.0l stroker. 99 Miata head. Oil sqirters are removed and plugged, VVT style oil pump. 10W-30 Castrol GTX for break in. Seems like it makes about 60 psi at Idle when warm. 90-100+ up in the rev range and pegs the needle. Should I be worried about this? Bob |
Whoa. This has to be a result of plugging the oil squirters. Lots of people shim their oil pump pressure relief valve to get more pressure so I wouldn't worry about it.
|
what oil pump are you running, i'm curious???
|
Originally Posted by Preluding
(Post 701265)
what oil pump are you running, i'm curious???
I figured the Bypass should regulate it back near stock. Bob |
That is pretty high I have some Honda buddies that had oil pressure that high when they got a little carried away shimming there pumps some of them had no problems others blew oil seals out like crazy. I would say it is a combination of the different oil pump and mostly blocking the oil squirters but it still seems really high for a stock pump. If you don't find a way to get it down some you are gonna have a set of broken oil pump gears on your hands.
|
Did you try putting a manual gauge on the side of the block where the sending unit is just to see if your gauge is off by chance?
|
Originally Posted by Sean
(Post 701296)
Did you try putting a manual gauge on the side of the block where the sending unit is just to see if your gauge is off by chance?
Bob |
Originally Posted by Sean
(Post 701295)
That is pretty high I have some Honda buddies that had oil pressure that high when they got a little carried away shimming there pumps some of them had no problems others blew oil seals out like crazy. I would say it is a combination of the different oil pump and mostly blocking the oil squirters but it still seems really high for a stock pump. If you don't find a way to get it down some you are gonna have a set of broken oil pump gears on your hands.
Bob |
Originally Posted by wayne_curr
(Post 701259)
Whoa. This has to be a result of plugging the oil squirters. Lots of people shim their oil pump pressure relief valve to get more pressure so I wouldn't worry about it.
|
You could have a possible partial blockage between the block and the head. I assume nothing is making noise? Another thing it may sound weird but throw a new different brand oil filter I have had filters in the past that significantly raise oil pressure but is is really just a blockage. I am not sure where the oil pressure gauge picks up in terms of oil passages but it would be a easy test to check.
|
speaking of oil filters, make sure yours isn't balooning :giggle:
definitely a combination of removing 4 significant oil outflows while increasing the oil inflow. I would have expected the oil pressure relief valve to be able to compensate for some of it, but the squirters flow a LOT of oil. Tight bearing clearances? |
Originally Posted by Sean
(Post 701322)
You could have a possible partial blockage between the block and the head. I assume nothing is making noise? Another thing it may sound weird but throw a new different brand oil filter I have had filters in the past that significantly raise oil pressure but is is really just a blockage. I am not sure where the oil pressure gauge picks up in terms of oil passages but it would be a easy test to check.
Bob |
Originally Posted by fooger03
(Post 701329)
speaking of oil filters, make sure yours isn't balooning :giggle:
definitely a combination of removing 4 significant oil outflows while increasing the oil inflow. I would have expected the oil pressure relief valve to be able to compensate for some of it, but the squirters flow a LOT of oil. Tight bearing clearances? I had Clevite and King Engine bearings before now I have ACL Race all were stock clearance. I debated on going with the extra clearance ACL's but didn't do it. Bob |
Run thinner oil?
|
Originally Posted by JasonC SBB
(Post 701374)
Run thinner oil?
Bob |
Originally Posted by bbundy
(Post 701300)
Same gage as I had before it is defiantly a lot higher pressure than I have had before. Although the last two times I had the motor apart there was definite rod bearing damage which is why I wanted higher flow and have added an Accusump.
Bob |
Re: 0W-20 does the film strength of oil go down with viscosity? That would be bad.
|
Originally Posted by Faeflora
(Post 701381)
Before you took your old motor apart, did you have any problems related to the rod bearing damage?
Bob |
Do you know how well the mazda factory bearings hold up under high HP? I am curious because those are what I have in my motor.
|
Did you disassemble and de-burr the new oil pump, or did you put it in as delivered from Mazda?
It sounds like your pressure relief valve may be partially stuck. I've experienced this in the past - it sucks. I have a high-flow pump, blocked oil squirters, oil pan baffle, and get 25-30 psi at hot idle. ~75-80psi at redline (8500 RPMs). FWIW, I have had problems with the pressure relief valve on my street car and my track car. For this most recent build, I sealed the stock oil pressure relief valve and am using an external in-line adjustable pressure regulator. Works very well. |
All times are GMT -4. The time now is 11:32 AM. |
© 2024 MH Sub I, LLC dba Internet Brands