Oil Pressure - Page 2 - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus ST > Focus ST

Focus ST The place to chat about general questions, window tinting, exterior body, interior and lighting upgrades for the MK3 2013-Current Focus ST.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 01-22-2014, 09:37 PM   #11
suss6052
Focus Addict
 
suss6052's Avatar
 
Join Date: Feb 2012
Fan#: 95752
Location: ..., MI
What I Drive: 2013 Ford Focus ST2 Ingot Silver

Posts: 12,793
Points 9,867, Level 66
Points: 9,867, Level: 66 Points: 9,867, Level: 66 Points: 9,867, Level: 66
Level Up 55% Completed
Level up: 55% Level up: 55% Level up: 55%
Forum Activity 28%
Activity: 28% Activity: 28% Activity: 28%
FF Reputation: 24 suss6052 Great Standing Member
Buy-Sell-Trade Rating: (3)


This document explains how your oil pressure is measured or interpreted on the gauge.

The engine temperature, engine oil pressure switch, and engine speed data are required for the additional gauge cluster to calculate it.

Oil pressure is always highest on a cold engine as well as at high engine speeds, the gauge reflects this indirectly.
__________________
Moderator for: DURATEC Ti-VCT Performance, ST Performance, MK3 Focus
suss6052 is online now  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-22-2014, 10:08 PM   #12
Ben_n
Focus Rookie
 
Join Date: Jan 2011
Fan#: 81742
Location: canton, MI
What I Drive: silver ford focus 2002

Posts: 6
FF Reputation: 1 Ben_n Good Standing Member
Buy-Sell-Trade Rating: (0)
When the oil is cold, the oil pump is at bypass mode, and the oil pressure is typically around 80-90 psi, and dropping with oil warming up; when fully warmed up ~200F, the pressure at high speed (>1500 rpm) would be around 50 -60 psi, and 15-20 ish at idle. Due to oil shear thinning, fuel dilution (a bit fuel in oil) and filter pressure loss increase, it's not surprising you got a bit more oil pressure right after oil change.
Ben_n is offline  
    Reply With Quote Quick reply to this message
Old 01-22-2014, 10:28 PM   #13
suss6052
Focus Addict
 
suss6052's Avatar
 
Join Date: Feb 2012
Fan#: 95752
Location: ..., MI
What I Drive: 2013 Ford Focus ST2 Ingot Silver

Posts: 12,793
Points 9,867, Level 66
Points: 9,867, Level: 66 Points: 9,867, Level: 66 Points: 9,867, Level: 66
Level Up 55% Completed
Level up: 55% Level up: 55% Level up: 55%
Forum Activity 28%
Activity: 28% Activity: 28% Activity: 28%
FF Reputation: 24 suss6052 Great Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by Ben_n View Post
When the oil is cold, the oil pump is at bypass mode, and the oil pressure is typically around 80-90 psi, and dropping with oil warming up; when fully warmed up ~200F, the pressure at high speed (>1500 rpm) would be around 50 -60 psi, and 15-20 ish at idle. Due to oil shear thinning, fuel dilution (a bit fuel in oil) and filter pressure loss increase, it's not surprising you got a bit more oil pressure right after oil change.
Technically this is not correct. The oil pump is not bypassed at all ever or the oil would not flow through the engine. I think you mean that with elevated pressure the oil filter medium is bypassed briefly until the oil heats up a little bit.

That's ignoring the fact that since most people freaked out about seeing the actual fluctuation of the oil pressure that most vehicle manufacturers went to either using dummy lights or dead gauges that don't so much as fluctuate when the engine is running until it's already too late and damage is done.
__________________
Moderator for: DURATEC Ti-VCT Performance, ST Performance, MK3 Focus
suss6052 is online now  
    Reply With Quote Quick reply to this message
Old 01-25-2014, 05:37 PM   #14
shawndevaraj
Focus Rookie
 
Join Date: Jan 2014
Fan#: 137105
Location: Plymouth, MI
What I Drive: 2014 Tuxedo Black Focus ST3

Posts: 2
FF Reputation: 1 shawndevaraj Good Standing Member
Buy-Sell-Trade Rating: (0)
Quote:
Originally Posted by suss6052 View Post


This document explains how your oil pressure is measured or interpreted on the gauge.

The engine temperature, engine oil pressure switch, and engine speed data are required for the additional gauge cluster to calculate it.

Oil pressure is always highest on a cold engine as well as at high engine speeds, the gauge reflects this indirectly.
Thanks for the reply. So, the engine oil pressure switch is just a switch for low oil pressure and does not actually measure the oil pressure?
shawndevaraj is offline  
    Reply With Quote Quick reply to this message
Old 01-25-2014, 05:47 PM   #15
suss6052
Focus Addict
 
suss6052's Avatar
 
Join Date: Feb 2012
Fan#: 95752
Location: ..., MI
What I Drive: 2013 Ford Focus ST2 Ingot Silver

Posts: 12,793
Points 9,867, Level 66
Points: 9,867, Level: 66 Points: 9,867, Level: 66 Points: 9,867, Level: 66
Level Up 55% Completed
Level up: 55% Level up: 55% Level up: 55%
Forum Activity 28%
Activity: 28% Activity: 28% Activity: 28%
FF Reputation: 24 suss6052 Great Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by shawndevaraj View Post
Thanks for the reply. So, the engine oil pressure switch is just a switch for low oil pressure and does not actually measure the oil pressure?
I'm not sure if it's only for low pressure, but the oil pressure gauge generally will read the same no matter what the oil in the crank case is based on the engine speed and temperature as well as that switch reading. It's a bit more sophisticated than an idiot light that the damped engine coolant gauge, but it's still not 100% raw data, only the boost gauge is real.
__________________
Moderator for: DURATEC Ti-VCT Performance, ST Performance, MK3 Focus
suss6052 is online now  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:50 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat