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Old 08-20-2007, 01:43 AM   #1
reddevil
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Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default Explain the Oil Pump #, and shim relationship!

So I have torn down a dozen or so motors now. And everyone has had a different oil pump. Since only a few were newer, only a few had numbers (7, 10) cast into the inside of the housing. The rest were blank.

Some of the older blank ones had 2 shims.

The 7 cast one, out of a 2.5 2006 RS, had 0 shims.

The 2002 WRX was a 10, havent torn it down yet for shim #.

Whats it all mean?
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Old 08-20-2007, 10:54 AM   #2
mick_the_ginge
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Join Date: Oct 2002
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Location: Portland, Oregon
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2003 Sleeved 2.5
Oil Dry Sump Goodness

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The stamped numbers are the thickness of the rotor. 7mm, 9mm, 10mm and now 12mm pumps are available.

The shims effect the oil bypass. More shims = more oil pressure before the bypass opens.
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Old 08-20-2007, 10:59 AM   #3
FuJi K
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MY99 GF4 JDM 6spd
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I have a WRX shortblock and also an EJ22T in the garage. Should I go inspect them? I also have my '99 2.2L NA shortblock as well.
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Old 08-20-2007, 09:19 PM   #4
ballitch
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98 cam'd EJ251
Wrx Tranny,slowr than ish

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id love to have a 12mm oil pump when i go turbo, just added insurance.......

<----wonders where to get one...



~Josh~
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Old 08-20-2007, 10:22 PM   #5
LastResort
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Old 08-21-2007, 09:56 PM   #6
reddevil
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goes 12.387 @ 116.5

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So I guess on the non-numbered older ones, I could just measure the thickness of the rotor?
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Old 08-21-2007, 10:06 PM   #7
mick_the_ginge
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Oil Dry Sump Goodness

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Quote:
Originally Posted by reddevil View Post
So I guess on the non-numbered older ones, I could just measure the thickness of the rotor?
yep, the only difference seems to be the shims and thickness of the rotor
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Old 08-22-2007, 02:27 PM   #8
engineerx
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^^^
Could the spring rate of the bypass mechanism also differ?

I've been wondering about this since I install the 12mm pump + 1 extra shim and I'm seeing pressures of less than 6 bars @ 6k+
- I'm running 10w-30 - still need to change the break-in oil to something heavier after 1500 miles (2nd oil change)
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Old 09-15-2007, 04:21 PM   #9
02RSBRP
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I think everybody has kind of misunderstood what pressure each oil pump runs at. Below is the numbers out of the manual for the 9mm and 10mm oil pumps.

Capacity at 80C (176F)
700 rpm Discharge
- pressure 98 kPa (1.0 kg/cm2, 14 psi)
- quantity

4.2 l (4.4 US qt, 3.7 Imp qt)/min. (9mm)
4.6 l (4.9 US qt, 4.0 Imp qt)/min. (10mm)

5,000 rpm Discharge
- pressure 294 kPa (3.0 kg/cm2, 43 psi)
- quantity

42.0l (11.10 US gal, 9.24 Imp gal)/min. (9mm)
47.0l (12.41 US gal, 10.33 Imp gal)/min. (10mm)

Relief valve operation pressure
490 kPa (5.0 kg/cm2, 71 psi) (9mm)
588 kPa (6.0 kg/cm2, 85 psi) (10mm)

Oil capacity (at replacement)
4.0 l (4.2 US qt, 3.5 Imp qt) RS
4.5 l (4.8 US qt, 4.0 Imp qt) WRX

Notice how even at 5000 RPM, that both pumps only put out 43psi. I agree that the relieve setpoints are different, but would you even get close to that setpoint? Maybe if you where spining at 8k, but more than likely you would be in the 65 psi range. So are you really increasing you oil pressure by putting shims into the relief valve?
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