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04-30-2016, 08:42 AM
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Join Date: Mar 2011
Location: Schwenksville PA
Posts: 42
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Does anyone have the part numbers for the viscosity valve and where to order?
Thanks!
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Al Rubin
N80AR RV8 flying
Based at KPTW
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04-30-2016, 05:47 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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For whatever reason, the O-320 D1A and D2As don't dump much heat in the oil. A number of flyers with those engines, me included, have observed this. I have exactly the same issue with my IO-320 D2A in the winter months, even with the oil cooler fully blocked off. I flew in 24F OAT a few weeks ago and never saw the upside of 158F O.T. Less than 2 weeks later the OAT was up to 72 and I again flew (with the oil cooler stilled 100% blocked off) and my max OT was 191F.
A couple years ago, one of our local hangar curmudgeons observed, "For whatever reason, the O-360s seem to dump a lot more heat to the oil than the 320s." That does in fact seem to be the case. 
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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04-30-2016, 07:03 PM
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Join Date: Dec 2008
Location: Minneapolis, MN
Posts: 113
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I installed a valve and relief in my RV-8
Here is what I did. Two winters and summers and it just works.
http://www.vansairforce.com/communit...=104139&page=2
I have pictures of the install - pm me if you want them.
__________________
Scott Elhardt
RV-8 N32SE -Finished!
Grove Gear, XIO-360-M1B
Whirlwind RV200
Dual PMags
Pitts S-1S Restoration in process!
Minneapolis, MN
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05-07-2017, 09:47 PM
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Join Date: Dec 2010
Location: New Hartford, NY
Posts: 12
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Low Oil Temps
I've been working low oil temps for a year now, and my performance is like you guys ... RV-8 with IO-360 M1B. What I've learned to date:
1. Vernatherm works as advertised. Tested proper expansion on my stove using a candy thermometer.
2. Oil Temp gauge works as advertised.
3. Installed cockpit-controllable oil-cooler vent (fully blocked) only helps to increase oil temp in warmer weather or higher power settings.
3. Cruising around at 10K ft., at 45% power, LOP, economy cruise, 35 degrees OAT, I see 160 degrees if I'm lucky...more like 150 degrees at 30 degrees OAT.
My conclusion is I've done a good job sealing up the cowling leaks (good), but everything works so well that the stock Van's intake/exhaust is too large for the cooling job. As a point of reference, Sam James cowling reduces intake area by 40%.
I've moved onto experimenting w/ smaller intake/exhaust areas, and encourage others to do the same. Will share my results once my grass strip has a chance to dry out (this has been a very wet spring for us in central NY!).
First step is to reduce the intake area by 25%. I've done this using foam strips inside the intakes and can't wait to fly!
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Mike Baldwin
dart.com
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05-08-2017, 10:22 AM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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Quote:
Originally Posted by Rupester
For whatever reason, the O-320 D1A and D2As don't dump much heat in the oil. A number of flyers with those engines, me included, have observed this. I have exactly the same issue with my IO-320 D2A in the winter months, even with the oil cooler fully blocked off. I flew in 24F OAT a few weeks ago and never saw the upside of 158F O.T. Less than 2 weeks later the OAT was up to 72 and I again flew (with the oil cooler stilled 100% blocked off) and my max OT was 191F.
A couple years ago, one of our local hangar curmudgeons observed, "For whatever reason, the O-360s seem to dump a lot more heat to the oil than the 320s." That does in fact seem to be the case. 
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this is same for me. I don't worry about the oil temp on my -9. Block the oil cooler in the Winter and open it in the Summer and just fly it.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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05-08-2017, 10:38 AM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,658
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No research at all, but - -
On ROTAX we can install a thermostat that works very well. Does not allow oil to go thru cooler until up to therm temp range. Uses 1/2" ID hose. Maybe that is an issue. Just noting.
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John Bender
Flying RV-12 - Serial #120036
Paid in May ( 5-2020 )
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05-08-2017, 01:04 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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Check your oil analyses ....
I used fret over low oil temps, but eventually decided to just watch my oil analyses carefully, since the lab always tests for water content. I've yet to have an oil report show any water at all. So - following the advice above - I block the cooler in winter, open it summer, and just "fly the plane." 
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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05-08-2017, 09:56 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,298
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Quote:
Originally Posted by Rupester
I used fret over low oil temps, but eventually decided to just watch my oil analyses carefully, since the lab always tests for water content. I've yet to have an oil report show any water at all. So - following the advice above - I block the cooler in winter, open it summer, and just "fly the plane." 
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same here. I am not in the camp that believes running oil temps in the 140-160* range causes damage. It is really a matter of temp & run time, along with the oil's retained water volume. I have all confidence that limited water will evaporate at 140* on a 1.5 hour run. However, load up your oil with water by a bunch of successive short runs and you'll struggle to get the water out at lower temps. High temps as well. The lower the temp, the longer the run needs to be to get rid of water. However, an engine that doesn't see short runs does not create a significant build up of water that needs to be removed.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 05-08-2017 at 09:59 PM.
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