Absolute Pace

Welcome to Club Cobra.

You are currently viewing the world's largest resource for Shelby related information as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!


Go Back   Club Cobra > Club Forums > Australian Cobra Club

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Nevada Classics
Keith Craft Racing
Main Menu
Nevada Classics
Nevada Classics
Keith Craft Racing
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
MMG Superformance
Keith Craft Racing
February 2021
S M T W T F S
  1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28            
  #1 (permalink)  
Old 08-08-2008, 05:47 AM
snaken's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2003
Location: Melbourne, Aust, vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
Not Ranked     
Default Less oil Pressure

Boys

Snaken is back running, no more oil leaks from the custom individual throttle body intake manifold.
BUT you have to make changes, so I fitted an oil cooler
The out come ............... suddenly I have less oil pressure. WHY would that be.
I am running from block through filter down to cooler and back to the engine. Running same oil, gauge is manual ( Smiths) but gone from 50 ish to 40 ish ???
Got 30 lbs on crank but only 40 ish on 1500 rpm. Only just got it fired up still on axle stands will give it a rev up in the morning, but anyone got ant ideas
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 08-08-2008, 06:41 AM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

I lost about 8 psi of oil pressure when I added an oil cooler to my road racer, small block Ford engine... I have used 4 different oil coolers over the years (headered type and single pass type) and get about the same results with all four... also using 12 AN lines... Talking to others about this, I think a 5 to 10 psi loss with an external oil cooler seems about the norm...........

David
__________________
DAVID GAGNARD
Reply With Quote
  #3 (permalink)  
Old 08-08-2008, 06:52 AM
snaken's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2003
Location: Melbourne, Aust, vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
Not Ranked     
Default

David,

What pressure did you drop to, and what is a normal oil pressure with oil cooler ?????
Reply With Quote
  #4 (permalink)  
Old 08-08-2008, 07:08 AM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

I have a Melling HP series oil pump that is adustable for pressure... Normally I run about 50 to 55 psi on track at speed once the oil is at temp (220 to 240 degrees)....idle oil pressure is 30 to 35 psi at temp...
I really like this oil pump, it is a blue printed pump from Melling is under 50 bucks.... it is stock pressure and stock volume (I don't care for high volume pumps), but where the spring is, instead of a plug in the hole, it has a large Allen head screw, screwing it in or out will adjust the pressure......

Start-up, cold oil, it goes to 60 to 65 psi, as the oil warms up, pressure drops....I'm runnig Mobil I 15/50...... I have tried other oils and get within 5 psi regardles of what type/weight oil I use....

Motor is a 331 cu in stoker, 12.75 to 1 compression, turning from 3000 to 7000 rpms on track......

For a street car/motor, I would think anything over 40 psi at speed would be fine, and 25 to 30 psi at idle.....
David
__________________
DAVID GAGNARD
Reply With Quote
  #5 (permalink)  
Old 08-08-2008, 07:08 AM
McD00's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2008
Location: Knob Hill, Monterey, CA
Cobra Make, Engine: 931 mangled in parkinglot incident - traded for new house roof <sob>
Posts: 113
Not Ranked     
Default

I also dropped 9 psi hooking up the cooler. This was with the oil cold. Once it warmed up and the oil thinned the oil pressure actually went up and almost matched hot oil pressure with no cooler Don't worry about it and don't beat on it until it's fully warmed up.


Long Live the Cobra!!
__________________
"...Just Shut the phuque up and Move on please..."
Reply With Quote
  #6 (permalink)  
Old 08-09-2008, 06:06 PM
snaken's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2003
Location: Melbourne, Aust, vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
Not Ranked     
Default Thanks

Thanks guys, took it out for a spin yesterday in the Melbourne sun.
Runs at 45 lb with engine warm. Will leave the cooler on and test at the Nationals in October.
Thanks for your help.
Snaken
Reply With Quote
  #7 (permalink)  
Old 08-09-2008, 07:49 PM
SuperHart's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2001
Location: Cinnaminson, NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
Send a message via AIM to SuperHart
Not Ranked     
Default

I have a 351W with oil cooler, high volume oil pump, -10 lines and a thermostatic sandwich adapter. Using 10-40 oil I run 55 lbs pressure until the thermostat on the oil cooler opens, then the pressure drops to 50 lbs. Believe it or not, I have found some pressure differences depending on which oil filter I use. Remember also that oil viscosity can also affect oil pressure. In my opinion, 45 lbs in a warm engine ain't bad so I would leave well enough alone. If you are not running a thermostat, please do yourself a favor and install one.
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
Reply With Quote
  #8 (permalink)  
Old 08-09-2008, 08:16 PM
Jac Mac's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gore. New Zealand., SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
Not Ranked     
Default

Remember flow pressure drops around 5 psi for each right angle turn, your cooler adapter between block & filter more than likely has a couple of drillings that nearly equate to this. The reason the pressure seems to increase when hot in this situation is the oil has thinned and has less resistance to flow. The advice not to rev it when cold is VERY GOOD and will save you $$$$ long term.
__________________
Jac Mac
Reply With Quote
  #9 (permalink)  
Old 08-09-2008, 08:34 PM
Bob In Ct's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2001
Location: Southern Connecticut, CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
Not Ranked     
Default

My oil pressure sensor is at the end of all the plumbing, after the filter and after the cooler. By going from 20W-50 to synthetic 5W-30 my oil pressure increased. I imagine the thinner oil can navigate the system far more easily and so loose less pressure along the way. I would have to think that less oil (if any) is now being sent through the bypass valve.

Bob
Reply With Quote
  #10 (permalink)  
Old 08-11-2008, 07:21 AM
snaken's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2003
Location: Melbourne, Aust, vic
Cobra Make, Engine: Homebush, Dodge Viper blue, white stripes, black traditional interior 347, AFR heads, Morrison injection, motec, T5, live axle, lead car Bathurst drivers parade 1999, 5.0L Cobra Nationals sprint title 2001
Posts: 87
Not Ranked     
Default

Thanks Guys,

I will check out the thermostat. May even try thinner oil at the next change. For now I will drive with one eye on the speedo as I am running out of points and the other on the oul pressure guage.

Snaken
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 06:10 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy