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08-27-2008, 06:22 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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IO-540; What Is Normal Oil Pressure?
I've been looking for info and could not find anything on a search for info just on the IO-540.
I just adjusted the pressure screw so now my readings are; Takeoff (oil temp 100F) Cruise: 75 PSI, Hot Idle: 24 PSI 
I still have 2-3 turns to go if I need it. It's the idle pressure that has me concerned. Is 24 PSI too low? If I bump the throttle it goes to 35PSI right away. I'm I worrying too much?
What are your readings with the 0-540 or IO-540?
Thanks in advance. 
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
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08-27-2008, 06:49 PM
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Join Date: Jan 2005
Location: Santa Clara, CA
Posts: 204
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The operators manual that I have says
All models except -F -J -N, Max 90 Min 60 Idle 25. -F -J -N, Max 90 Min 55 Idle 25
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RV6 built and flying
Bearhawk Patrol plans purchased
Last edited by AMURRAY : 08-27-2008 at 08:21 PM.
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08-27-2008, 07:02 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by AMURRAY
The operators manual that I have says
All models except -F -J -N, Max 90 Min 60 Idle 25. -F _J -N, Max 90 Min 55 Idle 25
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Thanks man! I feel better now. I can live with 1 PSI below min.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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08-27-2008, 07:08 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Normally idle oil pressure is not critical. If you have enough pressure to keep the lifters pumped up, there will be enough for the bearings. Nothing is carrying much load at idle.
I wouldn't worry about a pound or two at idle.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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08-27-2008, 07:12 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Thanks Mel, they are hydraulic lifers, that makes sense. This is just one of those things that rattles around in my brain. The pressure was 65 PSI @ cruise so I bumped it up to 75 PSI. It sure is nice to know everything is hunky dory.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
Last edited by Geico266 : 08-27-2008 at 07:36 PM.
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08-30-2008, 11:54 AM
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Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,339
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I0-540 Operatiing Limitations
Where does one find all of the operating limitations for an I0-540. Oil press, Oil temp, CHT, etc?
__________________
David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/21/2020
"In '69 I was 21, and I called the road my own"
Jackson Browne
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08-30-2008, 03:04 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Quote:
Originally Posted by dmaib
Where does one find all of the operating limitations for an I0-540. Oil press, Oil temp, CHT, etc?
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It's all in the operator's manual.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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08-31-2008, 06:19 AM
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Join Date: Jan 2005
Posts: 1,024
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Quote:
Originally Posted by dmaib
Where does one find all of the operating limitations for an I0-540. Oil press, Oil temp, CHT, etc?
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http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/ffae5a2bb5506dcc8625747a00650001/$FILE/1E4.pdf
Good Luck,
Mahlon
?The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk." |
08-31-2008, 06:56 AM
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Join Date: Jan 2005
Location: TX32
Posts: 1,890
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540's Rule!
Larry,
I have found on my Rocket's IO540 C4B5 that Multi Vis oil will change the numbers slightly on hot days, cooler temps, higher pressure at Idle.
Smokey
HR2
PS: Yep you worry too much...
Let's have fun out there!
Last edited by smokyray : 08-31-2008 at 06:59 AM.
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08-31-2008, 06:58 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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I'm running Shell 15w-50 now. Pressures are now in the normal range. Thanks to Bart & Sue at Aero Sport Aircraft Engines. They are the best!
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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