Recent Topics
Warranty Facts
by BrianC
1 minute 55 seconds ago
2010 Honda Pilot, 3.5, 30k on engine, 5,4k on QSUD
by p1zippie
Today at 06:32 PM
THE BABY SKUNK
by Charlie1935
Today at 06:04 PM
Affixing brackets to fiberglass
by Apollo14
Today at 05:17 PM
Brakes on the "Bluesmobile" - the final update
by GreeCguy
Today at 03:47 PM
Liquid Moly
by Pelican
Today at 03:43 PM
New altitude world record parachute jump
by Drew99GT
Today at 02:30 PM
Replacing Valve Stem Seals, Honda or Aftermarket?
by zpinch
Today at 02:28 PM
Saw Mercedes out testing the Concept Coupe SUV
by 01rangerxl
Today at 02:24 PM
high speed wipers
by hardcore302
Today at 01:59 PM
does one need all 4 winter tires?
by hardcore302
Today at 01:53 PM
Bosch Icon Wipers
by gpguy
Today at 01:41 PM
Newest Members
Hox, massbrad, jtrix, SR1919, bigdaveyl
51684 Registered Users
Who's Online
96 registered (901Memphis, 01_celica_gt, andyd, 77GrandPrix, 10 invisible), 1625 Guests and 227 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51684 Members
64 Forums
221159 Topics
3496641 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 1 of 2 1 2 >
Topic Options
#2899943 - 02/08/13 07:51 PM Pentastar 3.6 oil pressure
The_Captain Offline


Registered: 08/06/12
Posts: 121
Loc: Upstate S.C.
I wanted to know if any forum members had any insight on Pentastar oil pressure issues. I have a 2012 Jeep Cherokee 4X4 with 3900 miles. Now to the issue. My oil pressure runs between 68 to 80 psi until the oil temp hits approx 158 degrees. It takes several miles for the temp to reach that with the factory oil cooler.Once the oil hits the right temp the pressure drops to around 30 psi.Anybody have any thoughts, theories ,similar experiences or info on this engine? Thanks
P.S. The oil temps never goes above 179/180 degrees


Edited by The_Captain (02/08/13 07:59 PM)
_________________________
2012 Jeep Grand Cherokee 3.6 V6 4WD Pennzoil Ultra 5W-30 and OEM filter.

Top
#2899950 - 02/08/13 08:09 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
coolbird101 Offline


Registered: 11/22/12
Posts: 340
Loc: South Florida
Our pentastar equipped vehicle did the same, I beleive the oil pump is 2 speed, runs on high until temp comes up and than anything over 3k rpm (not sure about exact rpm) the pump runs on high.
_________________________
2013 Mazda 6
Valvoline Synpower 0w/20
Motorcraft fl400s

2005 Dodge Ram hemi
Valvoline Synpower 5w/20
Mopar m-090

Top
#2899974 - 02/08/13 08:34 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Dakota1820 Offline
formerly chevyboy14


Registered: 04/28/11
Posts: 3894
Loc: missouri usa
Couldn't it be because the oil is thicker and the engine is a tight tolerance engine which equals more pressure
_________________________
2004 Honda civic vp -m1 5w30
1998 Saturn sl2 -mobil super 5000 5w30


Top
#2899977 - 02/08/13 08:36 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
RiceCake Offline


Registered: 09/22/12
Posts: 1044
Loc: Coldtown, Canada
Tolerance =/= clearance.

Top
#2899997 - 02/08/13 08:54 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
coolbird101 Offline


Registered: 11/22/12
Posts: 340
Loc: South Florida
For me it would be an abrupt drop, not gradual like oil thinning.
_________________________
2013 Mazda 6
Valvoline Synpower 0w/20
Motorcraft fl400s

2005 Dodge Ram hemi
Valvoline Synpower 5w/20
Mopar m-090

Top
#2900005 - 02/08/13 09:02 PM Re: Pentastar 3.6 oil pressure [Re: coolbird101]
The_Captain Offline


Registered: 08/06/12
Posts: 121
Loc: Upstate S.C.
Same for me. It is almost instantaneous. 70 psi down to 30 psi in a few seconds.
_________________________
2012 Jeep Grand Cherokee 3.6 V6 4WD Pennzoil Ultra 5W-30 and OEM filter.

Top
#2900009 - 02/08/13 09:05 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
BillyTheKid Offline


Registered: 10/12/11
Posts: 418
Loc: ny
My jeep runs about the same oil pressure.

Top
#2900032 - 02/08/13 09:45 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Gabe Offline


Registered: 02/22/11
Posts: 1416
Loc: Chicago, IL
I thought that the Pentastar has some goofy electric oil pump set up.

Top
#2900062 - 02/08/13 10:31 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Billy_D Offline


Registered: 06/23/08
Posts: 967
Loc: midwest
Quote:
A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure.

A force balance mechanism inside the oil pump adjusts the size of the pumping chambers to alter oil flow. If the oil is cold, the pump reduces the size of the internal chambers. When the oil is hot and thinner, more oil is needed, and a spring increases the size of the pump chambers. This also saves energy.

The pump is driven at a 1:1 drive ratio; its location under the block is more efficient than an on-crankshaft location. An internal, mechanical ball-and-spring relief valve dumps oil into the sump when needed, for conditions such as a cold start with high engine speed. Both pump and pressure regulation solenoid are non-serviceable.


Source Pentastar.com

Top
#2900073 - 02/08/13 10:55 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
chubbs1 Offline


Registered: 06/09/10
Posts: 4574
Loc: Merritt Island FL, USA
I have 2 2012 Charger SXT's with the 3.6 Pentastar. I have been very happy with them. The oil pressure (OP) is very much like yours, when the temp of the oil reaches approx 174F the pressure goes from the 70-80PSI range to 35-41PSI range. The hottest my oil has gotten is 214F in stop and go traffic mid summer. The Lowest the pressure has gotten is 25PSI at idle in drive. I do find it "funny" that at exactly 174F the pressure drops but pressure is higher with thicker oils and thinner oils cause lower readings.
_________________________
'12 Charger SXT
QSUD 5w30 OEM filter

'12 Charger SXT
Edge FST EP 5w30 OEM (Mine;)

'11 Hyundai Sonata GLS
QSUD 5w20 OEM Filter


Top
#2900090 - 02/08/13 11:24 PM Re: Pentastar 3.6 oil pressure [Re: chubbs1]
crazyoildude Offline


Registered: 07/23/08
Posts: 5462
Loc: new jersey
i have heard of problems with those engines but have never seen any at my engine shop. A lot of new engines have ticks and knocking sounding noises that do not do any damage. Some have loud vvt some have other noises but a lot of the new engines seem to be a lot louder than the older ones.

Top
#2900182 - 02/09/13 06:58 AM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
Hokiefyd Offline


Registered: 06/24/04
Posts: 11446
Loc: North Carolina
I had a rental Chrysler 300 a few months ago and the oil pressure behavior was the same as you are observing. It's 75-90 psi for a while, then BAM, it drops to 25-40 psi and stays there, unless you hit 3,500 rpm, then BAM, it's back up to 75-90 psi. Odd, and you can feel it in the engine if you are feeling for it. The note of the engine changes just ever so slightly when the oil pressure spikes at 3,500 rpm.
_________________________
Cheers,
Jason

2008 Honda CR-V EX-L (QSUD 5W-30)
2005 Acura MDX Touring (FMC 5W-20)

Top
#2900186 - 02/09/13 07:04 AM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15149
Loc: Sunny Florida
The new vane pumps are very different from the gerotor style we are used to in most cars.

Add in the variable displacement feature and you have a bizarre readout to study for the "new normal".

many newer engines are now using this style oil pump. Since all the variable cam timing and cylinder deactivation strategies are operated hydraulically by oil pressure the new engines require a larger volume of oil flow.
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

Top
#2900511 - 02/09/13 01:35 PM Re: Pentastar 3.6 oil pressure [Re: The_Captain]
cptbarkey Offline


Registered: 02/27/12
Posts: 1230
Loc: texas
electric oil pumps... dont quite like the sound of that at all.
_________________________
2011 toyota sienna
2014 ram 1500
2000 nissan xterra (project)

Top
#2900605 - 02/09/13 03:05 PM Re: Pentastar 3.6 oil pressure [Re: cptbarkey]
caravanmike Offline


Registered: 05/09/09
Posts: 980
Loc: ohio
Originally Posted By: cptbarkey
electric oil pumps... dont quite like the sound of that at all.

everything i read says it is chain driven! the elec part controls high or low pressure. from what i understand the motor can survive just fine on low pressure.

"A chain-driven, vane-type variable displacement oil pump adjusts the flow rate and pressure as commanded by the engine management system, which uses a solenoid to drive the pump into low or high pressure mode. For example, below 3,500 rpm, the pump conserves energy by using low pressure; at speeds over 3,500 rpm, the pump switches to high pressure."
_________________________
Oils I use: Any 5w-30,5w-20 conventional
Filters I use: Purolator 14006, 20195, 22500

Top
Page 1 of 2 1 2 >