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ebbfmm(at)verizon.net
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 Posted: Tue Apr 24, 2007 3:14 am Post subject: Oil Temperature High |
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My friend is test flying an RV6 fuel injected 0320. At 75% power runs ie: engine break-in, he is seeing oil temperatures in the 210 – 220- range. This is with an OAT of 34 degrees. He has a firewall mounted oil cooler and used the van’s kit for installation, which utilizes a 3” scat duct. His feeling is that this is not enough airflow through the cooler and because the cooler plenum (shroud) is so squat that not enough air is being distributed across the entire face off the oil cooler. Any thoughts on this…Thanks
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AUTOTEXTLIST \s "E-mail Signature" <![endif]-->Fran Malczynski
RV6 - N594EF
Olcott, NY
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deruiteraircraftservices(
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| Posted: Tue Apr 24, 2007 3:48 am Post subject: Oil Temperature High |
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Hi,
Those temps are fine for an engine that is being run in. Red line is about 245F. Once he has a few hours on the engine and it loosens up a bit the temps will come down a bit.
It's not something that would worry me.
Marcel
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shempdowling2(at)earthlin
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| Posted: Tue Apr 24, 2007 5:13 am Post subject: Oil Temperature High |
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I had the exact same setup with an io360. Mine didnt cool much after break in. I ended up putting the cooler on the rear baffle. I havent heard many 320 temp problems though. Have him really, really check his baffling for leaks. It makes a big difference. If that doesnt work, I would just move it to the baffle and get it over with. At least that way you know its as good as its going to get.
Shemp/Jeff Dowling
RV-6A, N915JD
300+ hours
Chicago/Louisville
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n801bh(at)netzero.com
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| Posted: Tue Apr 24, 2007 5:39 am Post subject: Oil Temperature High |
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For a fresh motor, 210-220 f is about perfect. Just my two cents worth....
do not archive
Ben Haas
N801BH
www.haaspowerair.com
-- "Jeff Dowling" <shempdowling2(at)earthlink.net> wrote:
I had the exact same setup with an io360. Mine didnt cool much after break in. I ended up putting the cooler on the rear baffle. I havent heard many 320 temp problems though. Have him really, really check his baffling for leaks. It makes a big difference. If that doesnt work, I would just move it to the baffle and get it over with. At least that way you know its as good as its going to get.
Shemp/Jeff Dowling
RV-6A, N915JD
300+ hours
Chicago/Louisville
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bicyclop(at)pacbell.net
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| Posted: Tue Apr 24, 2007 10:15 am Post subject: Oil Temperature High |
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The squat plenum may well be causing some turbulence and reducing airflow. The sides of the plenum shouldn’t diverge more than 19 degrees, if I remember the figure correctly, to keep the airflow attached. Pay attention to the exit side also. If there are obstructions, it can reduce airflow.
We’ve got a firewall mounted Niagara with 3 inch scat (one 90 degree bend) on our 6-a, O-320. It has a long plenum and is fine for winter and spring (185-195), but doesn’t do well enough in summer (220+). We’re thinking seriously about moving it to the baffle. In the meantime, 750 hrs worth of it, we change the oil at 25 hrs, tach.
Pax,
Ed Holyoke
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kboatright1(at)comcast.ne
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| Posted: Tue Apr 24, 2007 2:39 pm Post subject: Oil Temperature High |
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I had high temperatures on my O-320 RV6 initially and eventually solved the problem, primarily through more airflow. I agree that 210-220 is high with a 34F OAT (presumably at the surface level), even for a new engine.
In the past, Vans has indicated that a 3" scat tube is very marginal for feeding a firewall mounted cooler on an RV-6. That's only a cross section of 6 or 7 square inches. A 4" SCAT tube would have almost double the cross section and have less flow loss from surface friction.
My recommendation is to increase the size of the SCAT tube...
KB
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tcervin(at)valkyrie.net
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| Posted: Tue Apr 24, 2007 3:19 pm Post subject: Oil Temperature High |
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Kyle.....Good idea!!! I have a 4" Tube running to the firewall mounted cooler on my RV6-A. I have never seen an Oil Temp. above 185 and my RV is running the 0-360-A1A.
Tom in Ohio
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Tue Apr 24, 2007 9:50 pm Post subject: Oil Temperature High |
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In a message dated 4/24/2007 6:16:14 AM Central Daylight Time,
ebbfmm(at)verizon.net writes:
His feeling is that this is not enough airflow through the cooler and because
the cooler plenum (shroud) is so squat that not enough air is being
distributed across the entire face off the oil cooler. Any thoughts on this…
_http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5000_
(http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=5000)
This arrangement has worked well on my 150hp E3D for over 400 hours. Click
| Quote: | >Next Entry>> at top of page for more entries, and click on foto for bigger
look...
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| Quote: | From The PossumWorks in TN,
Mark RV-6A "Mojo"
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