help please. oil press issue...

[lilpiton]

how do you know what your oil pressure is? are you sure your gauge is accurate? could just be off...

as for the losing power - without knowing anything about your car other than it's losing power like a fuel cut, have you tried pulling ecu codes? have you changed anything recently (i.e. fuel pump, injectors, fuel filter, type of gas you run, etc)?

Since it's a new rebuild, have you checked things again, such as compression, tps voltage, vacuum leaks, etc, etc.

I'd start w/ pulling ecu codes.

ok time to get this going again since winter is over almost and i didnt drive the car then.so when the car is just sitting there in the garage warmed up nice, the oil press will be like 26psi and when i stert driving it the oil press will be about the same, maybe like 24psi. but when i floor it lets say 1st and 2nd and then stop on a light or so the idle will drop to like 500rpm and rais back up and the oil press will be like at 16psi. i got the auto meter oil press gauge machanical.Anyone has any clue what this might couse for the oil press to be like that.I got standard size cosworth main and rod bearing if that helps. This one guy told me maybe the bearings are smalled then suppose to be and you loosing press there, does this sound right?Any help is greatly apprisiated...

Oh and like the guy said above check ECU codes. how am i suppose to check em if the check engine light is not on!

[lilpiton]

so 10 vievs and nothing! im F***ED!

[CSUPUEBLOTIM]

If you got standard bearings and your lobes were excessively worn(out of spec, requiring undersize bearings) then you would have low oil pressure. Or if your bearings are so tight that oil can't flow around them. Is the oil pump your using new or did you reuse the one it came with? What other mods do you have done to the engine and what kind of tuning?

[ddgsxr504]

Factory FSM says it should be between 60-70psi at 3000 rpms.

At operating temp and idle (750rpms) my oil pressure is between 16-20psi at idle and it's at 58-62 psi at 3000rpms. My engine also has 205,030 miles on stock (original) internals.

If at idle your oil pressure is at 16psi then you are fine. As long as you are getting 60-70psi at 3k rpms then you are straight.

[lilpiton]

If you got standard bearings and your lobes were excessively worn(out of spec, requiring undersize bearings) then you would have low oil pressure. Or if your bearings are so tight that oil can't flow around them. Is the oil pump your using new or did you reuse the one it came with? What other mods do you have done to the engine and what kind of tuning?

Well i bought the standers bearing and when i took the block to the machine shop they mesured everything and they said the bearings were right and the crank wasnt resurfased, they put the bottom end back together. NOTE: The motor didnt have a rod knock before i did the rebuild the piston blew...The pistons are stock oversized 0.20 over.Got a 1.2mm cosworth headgasket. Its an s15 SR year 2000 and when i took the oil pump off i took a good look at it, inspected it and seemed fine so put it back in since it seemed fine and is not that old. when cold the oil press is like at 82psi so that seems right, i figured if the pump would be bad the cold start wouldnt have that high of press or im i wrong not?Well to tell you about the mods still got stock turbo. HKS ex mani, elbo and intake, 3inch DP and 3inch catback the car was never tuned just running stock ECU no boost controller either.

[lilpiton]

Factory FSM says it should be between 60-70psi at 3000 rpms.

At operating temp and idle (750rpms) my oil pressure is between 16-20psi at idle and it's at 58-62 psi at 3000rpms. My engine also has 205,030 miles on stock (original) internals.

If at idle your oil pressure is at 16psi then you are fine. As long as you are getting 60-70psi at 3k rpms then you are straight.

Not sure how much i got at 3000rpm but it isnt low, ill check tomorrow how much i get at 3000rpm for sure but it is up there not low. the thing is that why my boys S14 sr has 24psi constant at idle?

[ddgsxr504]

Not sure how much i got at 3000rpm but it isnt low, ill check tomorrow how much i get at 3000rpm for sure but it is up there not low. the thing is that why my boys S14 sr has 24psi constant at idle?

Every car is different especially when the are this old. Maybe your boy has a newer pump, oil line size, reistrictor for the turbo? Bottom line, at operating temp if you are getting the numbers I gave you then don't worry about it. If you are wanting more pressure then put in a new pump.

[lilpiton]

Every car is different especially when the are this old. Maybe your boy has a newer pump, oil line size, reistrictor for the turbo? Bottom line, at operating temp if you are getting the numbers I gave you then don't worry about it. If you are wanting more pressure then put in a new pump.

Okay sounds good, i mean i did 1100 miles so far on the new rebuild, just making sure i dont get a rod know or something. As of what i remember before the rebuild i had the oil press about what he has now. Oh and my motor is newer ther his, mine is s15 his is s14...Thanks

[tercel drifter]

First off the pump does not create any pressure at all, it creates flow,Resistance to flow is what creates pressure.Tempature of engine is also a major factor, when the oil is cold it will be a lot more viscosity will be much thicker and the oil pressure will be much higher.Now at low or high idle there won't be much of a difference since there is no load of the engine. When driving around the oil pressure should be higher since there is a load on the engine. Go check the FSM for manufatures specification.

Hope that helps,Alex

[lilpiton]

First off the pump does not create any pressure at all, it creates flow,Resistance to flow is what creates pressure.Tempature of engine is also a major factor, when the oil is cold it will be a lot more viscosity will be much thicker and the oil pressure will be much higher.Now at low or high idle there won't be much of a difference since there is no load of the engine. When driving around the oil pressure should be higher since there is a load on the engine. Go check the FSM for manufatures specification.

Hope that helps,Alex

Thanks alot to all of you, did halp me out and im not that worried anymore...

[lilpiton]

Thanks alot to all of you, did halp me out and im not that worried anymore...

So last night it f***en snowed in chicago so i couldnt take my car out and see how much oil press i get at 3000rpm but once it clears up on the roads ill check it out and let you guys know what my numbers are...Thakns alot yall!

[ddgsxr504]

Now at low or high idle there won't be much of a difference since there is no load of the engine. When driving around the oil pressure should be higher since there is a load on the engine. Go check the FSM for manufatures specification.

Wait... what?? At idle (750rpms) my oil pressure is 20psi, with the car in neutral i can rev the engine and hold it at 1500rpms and the oil rises to 40psi. How is there no difference in pressure if the engine is under no load?

If I rev my engine to 3000rpms my oil pressure goes up to 60psi. Now I can understand that under load the pressure will be higher but we are talking +5psi or less.