jobryan26

I just changed my oil about two weeks ago to Mobil 1 synthetic(10w30). A couple of days ago I noticed that when I first start my car after setting all night my oil pressure gauge is maxed out. After it warms for about 10-15min it drops to 40-45. When running down the road at 60mph my oil pressure is at 45-50. I also noticed some ping or tapping tonight like my timing was to high. I just reset my timing to stock about 1 week ago so I don't think it's off. Anyway is my oil pressure way to high? My friend thinks so. Why?

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

Dan91Z

my oil pressure does the same thing.. it jumps all the way up after shaking around a little til the car has been running for about 10 minutes then hovers around 45... seems kinda odd

jobryan26

Dan where is Union? I'm close to Paducah,Ky.

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

Corry

Befire getting concerned about anything in oil pressure be sure to connect a known good mechanical oil pressure gauge and observe that! My oil pressure is often off the scale of my digital dash, It has ben this way since I got the car 2.5 years ago! I haven't seen any catastrophic engine failure yet (knock on wood!)


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Corry Lazarowitz
clazarow@voicenet.com
clazarowitz@hotmail.com
1987 Pontiac Trans AM (GTA?) 350 TPI
SLP 1 3/4" headers, 3" cat back (stock cat
MSD ignition.
MSD Blaster SS coil.
3.73 Rear end gears
Accell 8.8 Wires
Bosh +4 Spark Plugs (Don't know if they really help but hell!)
Holley AFPR
Race Built Automatic trans ('vette servo, shift kit, tightly packed clutches)--just needs titanium gears now!
Newly gutted cat (the car gutted it's own cat!)
More soon when funds are avail...

jobryan26

The reason I ask is I had a new sending unit put in about 4 months ago and my gauge wasn't doing this before. My first thought was the Synthetic oil was breaking loose all the buildup of gunk inside my engine and maybe some of it has gotten on the Pickup Sreen but I ruled that out because it would be backwards, my oil pressure would be running lower not higher. So why would it be running so high or is this to high?

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

FlashGTA

Even though almost all oils are multi-viscosity they still get thinner as they heat up. So your oil pressure will decrease as the oil thins out while warming up. Unless your getting high enough to bypass the filter. In that case the oil pressure would go up to the bypass setting and stay their all the time or until the oil is hot enough to bring the pressure back down.The old rule of thumb is 10 PSI for every 1000 RPM is required for a healthy engine. I used to run 125 PSI relief on a Cleveland because their oiling systems sucked.

burnoutrpm

dont complain that oil pressure...(if turly correct!) is about right it's normal on a good engine...i mean hell enjoy it!!

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89 firebird formula

360 10.5:1compression (350 .060 over)/fully balnced and blueprinted
comp cams xe262 cam
performer rpm intake/port matched to heads
#1407edlebrock 750
sportsman 2 heads 64cc 2.02/1.60 valves 200cc intake runner/cnc pocket ported
msd 6al/msd8.5 super condutor wires
h.e.i. proform 50,000 volt vac. advance ditributor
700r-4 with 3.08 first gear and 3.23 posi 7 5/8 rear end.
b trans shift kit(will kill shifts...suck dong!!)
shorty heddman hedders with custom 3" pipe y-pipe back(no damn cat!) with 40 series flowmaster!
griffin daul1" core rad.cutom fabrication to fit(but no cutting )

future mods: 406 roller REALLY REALLY REALLY RADICAL!!!!!

Vader

Flaash is correct about oils getting les viscous and flowing more easily when heated - mineral oils at least. Synthetic oils are a lot more thermally stable than mineral oils, and will maintain their viscosity when heated. Also, as teh engine gets warmer and all clearances are tightened up from thermal expansion of the materials, the pressure can actually increase with a thermally stable oil.

I phreaked out when I first saw the high pressure on a hot engine, and replaced a gauge sending unit, verified the pressure with a mechanical gauge, and then another because I didn't believe the first. I think I understand it now.

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Later,
Vader
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"What a Day..."
Adobe Acrobat Reader

jobryan26

Thanks guys I feel better now. I didn't know if too much Oil Pressure would mess something up or what but I think I'm O.K. Thanks again.

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

chret

What kind of oil filter are you using. I have noticed that if I use Purolator One (crap) that I get relatively normal oil pressure. but when I use K&N (kick a$$) my oil pressure rarely runs lower than 60.

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'92 Camaro Z28 5.7L LT1(B4C) 25th Anniversary Edition Holley Air Foil, MSD Coil and Ignition, Dual K&N Air Filters with modified intake, TCI StreetFighter 700R4, TCI Saturday Night Special Torque Converter, TPIS Aluminum Drive Shaft, Performance Resources Computer Chip, No Cats, True dual exhaust with dual Flowmasters,

jobryan26

I'm using AC Delco. I use to think an Oil Filter was just an Oil Filter till I read this article someone posted a little while back. http://members.nbci.com/minimopar/oilfilterstudy.html

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

Enkil

Actually.. Fram is pretty crappy.



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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else

chret

Yes fram is the worst. but cheap.

85berlinetta

I HATE Fram filters. I had one of their filters come lose twice. I even tightened it down with an oil filter wrench. The next one that I replaced that one with came apart on the inside. A guy I talked to that works with Alied Signal says they are junk. AC Delco now.

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lg4
slp muffler
pro flow air cleaner
performer intake
cat delete
ratchet shifter
160* stat
q-jet from 1979 vette

JAYDUBB

I dont think its anything to worry about. I used to own an 82 5.0 Mustang (Please, just shoot me!) and a 82 Monte Carlo that had a 350 installed in it by the previous owner. When I put Mobil 1 oil in them, I immediately noticed a 5-7 PSI drop in oil pressure, AND lower oil temps. The synthetic oil is much easier to pump, and it cools the bearing surfaces better. I love the stuff myself, and I still use it today in my 98 Grand Prix GTP. And my fiance(?) uses it in her Dodge Neon (she cant handle power yet).

Calm down, its nothing to worry about! I hope you dont have an oil leak anywhere because Mobil 1 is EXPENSIVE!!!

Holla!

Anniversary-SS-man

Just like everyone else said, don't worry. And, for another oil filer option, I've used Mobil 1 filters since they came out - they've worked out great and not lowered my oil pressure at all.

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• 1997 30th Anniversary SS LT4 #74 with all SLP options and K&N, white gage faces, and Hotchkis shock tower brace - In process: Kenny Brown SFC's
• 1996 Corvette Grand Sport LT4 #509 with K&N, Flowmaster exhaust, Hypertech power programmer, and Baer slotted/cross-drilled brakes, MSD Digital 6 ignition - In process: SLP throttle body and 1-3/4" headers, AFR heads, 4.10 gears, custom Panasonic/Alpine/Audio Control/ADS audio system
• 2000 Chevy TrailBlazer