low oil pressure

[Bri7man]

I had low readings so I got an oil pressure tester from napa to confirm, I got same results. 20-25ish on cold startup, pin to 4 normal op idle, and barely 25psi at 2500 rpm's.

I'm running mobile1 0w30.

New oil pressure sender switch installed tight.

Any ideas as to why this is?

 

[figgie]

did you use the TSRM?

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=LU&P=4

 

[Bri7man]

uhh no, I knew beforehand where my psi should be and looks like I was spot on.

When I was assembling my engine from being surfaced and mhg I replaced all seals and gaskets.

I was thinking it could be my oil pump, but when I had my oil pan off it looked MINT.

 

[Zumtizzle]

What were oil pump clearences?

What were bearing clearences?

What oil cooling system?

 

[Bri7man]

7mgte stock.

I didn't check I figured it was fine when I was assembling it. Didn't hit me as something that normally should be replaced I guess.

 

[Zumtizzle]

Mileage?

It's hit or miss.

BUt ussually the relief spring has to be.

 

[Bri7man]

I ordered this engine from japan with I believe 55,000.... very close to there.

 

[Zumtizzle]

^LOL.

Now thats a joke.

Isn't this a new rebuild? Why 0-30 so fast?

 

[figgie]

Ok jus tso we are clear.

Are you 100% sure that it is not 4.3? Accuracy of the guage?

 

[Bri7man]

^LOL.

Now thats a joke.

Isn't this a new rebuild? Why 0-30 so fast?

Wait what? I got it from a ebay company and machined the head/block then cometic hg +arp studs. 0-30?

Ok jus tso we are clear.

Are you 100% sure that it is not 4.3? Accuracy of the guage?

Yeah because I hooked up a napa oil pressure tester and it was the same reading as my stock boost gauge.

edit: sorry! wrong button!

 

[figgie]

Bri7man

I need numbers (just like the TSRM needs numbers). I know the stock guage does not have numbers that low and it is usually a wise idea to use a 15 psi gauge for idle check as you really need the resolution.

 

[Bri7man]

The psi numbers are in op.

What other numbers are you talking about?

To add to it, I never see anything over 25 at 3000 rpms and for that matter revving to redline will get me 40.

 

[IJ.]

I ordered this engine from japan with I believe 55,000.... very close to there.

So it's done 2750 miles a year?

Are you really that gullible?

 

[Zumtizzle]

The 7M has a Stock Relief of 40PSI thanks to the stock oil cooler.

 

[Bri7man]

So it's done 2750 miles a year?

Are you really that gullible?

Uhh I guess so. They advertised like all the engines they sell come from cars 40k-60k. All they did was sell jdm engines I believe.

Anyways I spun a rod tonight going heads up against a stock 03 mustang gt.

Smoked him all 4 passes but on the last after I pulled over my engine was squeaking.

It's my fault completely I shouldn't have been racing with low oil pressure.

 

[IJ.]

Seriously how does a 20+ year old car only do 40K miles?

Can't believe that you guys trust this bullshit they're OLD FUCKED engines you're buying second hand junk thinking you're getting something low mileage..... :nono:

As for racing with an engine that has low oil pressure you're a moron plain and simple.

 

[Bri7man]

I agree.

 

[enjoyer]

IJ what's wrong with low mileage on an old car? For example i drive about 3000miles per year. Maybe a bit more. Now, just imagine, if i had a new car? After 20 years no one would believe it's mileage is that low, but it would be true.
Also, i know one person who owns a 92 legend with 40k miles. Also, there is one person with 30k miles on a 82 rx7.
So, low mileage is possible.

 

[IJ.]

It's very very rare, and NOT every single engine that comes out of Japan....

Back when there were low mile engines most if not ALL of the exapmles I'd seen/tore down had NEVER been serviced or had an oil change once the warranty period had ran out and had sat idling in traffic all their life so were FULL of sluge varnish and gloop pretending to be Oil....

I bought my car in 1997 it had 160,000 Km's on it (99,000 miles) and at the time here it was considered very low Km's for it's age)

Google "low mileage japanese engines myth"...

 

[Bri7man]

Yeah you're right it makes sense. A thin layer of sludge pretending to be oil is exactly right.
When I had my engine apart it had that film all over. Not bad but still I'm pretty sure if the engine had oil changes on time it wouldn't be there.