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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Oil Pressure Woes !!

  • Thread starter Thread starter Rjaaaaaa
  • Start date Start date Feb 20, 2017
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85_SS_302_Coupe

it sucks (I know) to be on the receiving end
15 Year Member
Nov 11, 2003
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Northern KY
Feb 23, 2017
#21
  • Feb 23, 2017
  • #21
My car has always been around 20 at idle, both with the stock engine and the stroke (which was bought used). No idea what it's at when under load.
 

90sickfox

Wasn't a pretty sight...and I've got big hands
SN Certified Technician
Mar 2, 2015
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Feb 23, 2017
#22
  • Feb 23, 2017
  • #22
Figured I'd ask what rpm your idle is set at ?

If the idle is set low for the cam then the oil pressure will read low. With my comp xe282hr the oil pressure drops a lot at about 650- 700rpm....my car is also barely running at that point. I have an aftermarket gauge and never see 0psi unless the engine is off...I'm at 80psi warm at 3000rpm
 

Rjaaaaaa

Well-Known Member
Jul 11, 2016
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Feb 23, 2017
#23
  • Feb 23, 2017
  • #23
Idle set at around 1100 rpm.
Went out today for a 20 min trip, 72 degrees today so I couldn't resist. Oil pressure stayed in the center of the gauge range for the entire trip up and back, only dipped about 5# even at idle. Engine temp. remained normal so things are looking up. I don't see any of those 60 to 80# pressure though.
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
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gainesville
Feb 23, 2017
#24
  • Feb 23, 2017
  • #24
1100 is high. Even with an x Cam you should be sitting around 850-900 at idle.
 

90sickfox

Wasn't a pretty sight...and I've got big hands
SN Certified Technician
Mar 2, 2015
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Feb 23, 2017
#25
  • Feb 23, 2017
  • #25
I'm in agreement with stykthyn 1100 is a little high. My motor is a fresh rebuild with tight clearances and a strong pump. My stock motors usually ran between 20 and 60psi.
 

Rjaaaaaa

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Jul 11, 2016
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Feb 24, 2017
#26
  • Feb 24, 2017
  • #26
90sickfox said:
I'm in agreement with stykthyn 1100 is a little high. My motor is a fresh rebuild with tight clearances and a strong pump. My stock motors usually ran between 20 and 60psi.
Click to expand...
]

It will idle at a lower rpm but it really lopes and with the smaller pulleys the alt. doesn't like it. 1100 feels okay and it really doesn't have any pros or cons with 900 or 1100.
 

Rjaaaaaa

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Jul 11, 2016
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Feb 24, 2017
#27
  • Feb 24, 2017
  • #27
90sickfox said:
Figured I'd ask what rpm your idle is set at ?

If the idle is set low for the cam then the oil pressure will read low. With my comp xe282hr the oil pressure drops a lot at about 650- 700rpm....my car is also barely running at that point. I have an aftermarket gauge and never see 0psi unless the engine is off...I'm at 80psi warm at 3000rpm
Click to expand...

why would you want your idle so low??? unless you what that real lopey sound
 

RaggedGT

Been here over a DECADE and still no CT
Mod Dude
Jul 20, 2014
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Taylorsville ky
Feb 24, 2017
#28
  • Feb 24, 2017
  • #28
Rjaaaaaa said:
why would you want your idle so low??? unless you what that real lopey sound
Click to expand...
Turbo car
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
Jul 6, 2006
5,232
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gainesville
Feb 24, 2017
#29
  • Feb 24, 2017
  • #29
Rjaaaaaa said:
why would you want your idle so low??? unless you what that real lopey sound
Click to expand...
Because I like to party
 
Reactions: General karthief

90sickfox

Wasn't a pretty sight...and I've got big hands
SN Certified Technician
Mar 2, 2015
6,945
5,816
213
Feb 24, 2017
#30
  • Feb 24, 2017
  • #30
Rjaaaaaa said:
why would you want your idle so low??? unless you what that real lopey sound
Click to expand...

RaggedGT said:
Turbo car
Click to expand...

stykthyn said:
Because I like to party
Click to expand...

My idle is set at 800. During initial tuning my rpms were all over the place. A low idle makes for lower oil pressure.

And... I like to party !!!
 
Reactions: RaggedGT

latamud

Founding Member
Oct 22, 2002
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Tampa, FL
Feb 27, 2017
#31
  • Feb 27, 2017
  • #31
Sounds like a pressure relief valve stuck open. If there were ever and metal shavings that pushed past the valve it could get stuck and not allowed to close. This would allow hotter thinner oil or higher pressures to flow easier through the gap through the valve bypass, dumping back into the oil pan. The sender is probably after the filter too so some restriction there could also allow lower pressure readings.
 

Rjaaaaaa

Well-Known Member
Jul 11, 2016
217
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Feb 27, 2017
#32
  • Feb 27, 2017
  • #32
latamud said:
Sounds like a pressure relief valve stuck open. If there were ever and metal shavings that pushed past the valve it could get stuck and not allowed to close. This would allow hotter thinner oil or higher pressures to flow easier through the gap through the valve bypass, dumping back into the oil pan. The sender is probably after the filter too so some restriction there could also allow lower pressure readings.
Click to expand...
The pressure relief valve is in the filter, right? So a change of filter might help that, ordered new sending unit and have changed oil filter. must say I never gave this area a thought, thanks
 

Rjaaaaaa

Well-Known Member
Jul 11, 2016
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Feb 27, 2017
#33
  • Feb 27, 2017
  • #33
stykthyn said:
Because I like to party
Click to expand...
???
 
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