Oil pressure and filter bypass mode

[Craig]

Ok guys I have a 6.1L Chrysler hemi in my SRT8 jeep
which is reading oil pressures of 80 psi when the oil
is cool ( 45-50 F) and am accellerating slowly. I'm not
exactly sure where the pressure is measured but could this
mean that when using a quality oil filter that has a bypass
valve that the bypass is open when the pressure is this high?
I will be switching to the EaO filters next oil change and
maybe a lighter than 0W/5W-40 oil as speced by Chrysler.
Thanks,
Craig

 

[glenncof]

Get a circuit of the oil flow system in your engine first. See where the pressure is measured.

On one of my engines I have a dry sump. The oil is pumped from the sump and fed to the crank and cams starting at front of the engine. Pressure and temp are measure at the rear.

A separate pump pulls from sump and feeds into the filter/resovior/cooler which drains into sump.

My point is not knowing circuit and sensor location it's hard to draw any conclusions.

 

[427Z06]

Most oil pressure senders on stock vehicles are located just after the oil filter or a main oil gallery. The pressure readings your referencing have little to do with the differential pressures across the oil filter, and thus, will not, with any degree of accuracy, tell you if your oil filter is in the bypass mode or not.

 

[Gary Allan]

Check with your dealer ...err.....never mind ...check on some message board ...in 04 Jeep went to an "idiot needle". They may have since seen the light ...or perhaps saw fit to put a special deal in the Hemi equipped jeeps. It would be odd to give you a pegged idiot needle.

..but to answer your question... In my observations you're at elevated PSID when you're max'd out in oil pressure. Whether or not this reaches the bypass valve threshold is unknown unless you can rad across both sides of the filter as was stated.