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Albert Gardner
Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ
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 Posted: Tue Jul 14, 2009 7:41 am Post subject: High Oil temps |
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I think I have my high oil temps problem under control finally. I previously
had added a high capacity oil cooler on the right side but still was seeing
temps climbing too high now that summer is upon us. I added 2
non-retractable cowl flaps on the bottom. The rectangular opening in the
cowl is 4 x 9 inches. The opening at the rear is 2 x 4 inches. They are
non-retractable because the mufflers would interfere. This seems to be a
final fix. I'll try it tomorrow with daytime temps at 111. Good thing KNYL
is at 216'.
Albert Gardner
Yuma, AZ
N991RV
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RV-9A N872RV
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n223rv(at)wolflakeairport
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| Posted: Tue Jul 14, 2009 3:09 pm Post subject: High Oil temps |
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We did the same thing, but used 2 more of the Vans vents. Same
location as you did and got similar results.
Sent from my iPhone
On Jul 14, 2009, at 11:35 AM, "Albert Gardner" <ibspud(at)roadrunner.com>
wrote:
| Quote: | I think I have my high oil temps problem under control finally. I
previously
had added a high capacity oil cooler on the right side but still was
seeing
temps climbing too high now that summer is upon us. I added 2
non-retractable cowl flaps on the bottom. The rectangular opening in
the
cowl is 4 x 9 inches. The opening at the rear is 2 x 4 inches. They
are
non-retractable because the mufflers would interfere. This seems to
be a
final fix. I'll try it tomorrow with daytime temps at 111. Good
thing KNYL
is at 216'.
Albert Gardner
Yuma, AZ
N991RV
<FILE0346 (Small).JPG>
<FILE0347 (Small).JPG>
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ScooterF15
Joined: 19 Jun 2006
Posts: 136
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| Posted: Tue Jul 14, 2009 3:44 pm Post subject: High Oil temps |
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I did some flying this weekend. I flew from Fort Worth (very hot) to Meadow Lake (near Colorado Springs, very high) and back. I have a IO-540D4A5 with the standard Van's installation (plus some added louvers just forward of the stock louvers). I have had high temperature problems with the cylinder heads and the oil in the past while flying this same route. As a technique on this trip I climbed at 2500 RPM with full rich mixture. My average rate of climb to 10500'/11500' was about 1000 fpm. The average fuel burn rate was 20 gph. I climbed at around 105 KIAS. That is a high fuel flow, however, I only burned about 3 gallons getting to altitude. The good news is, my CHTs stayed below 400 and the oil stayed around 200 for the climb. This will be my climb technique until I have a chance to look at additional cowl modifications.
-Jim
N312JE
On Tue, Jul 14, 2009 at 5:56 PM, Michael Kraus <n223rv(at)wolflakeairport.net (n223rv(at)wolflakeairport.net)> wrote:
[quote]--> RV10-List message posted by: Michael Kraus <n223rv(at)wolflakeairport.net (n223rv(at)wolflakeairport.net)>
We did the same thing, but used 2 more of the Vans vents. Same location as you did and got similar results.
Sent from my iPhone
On Jul 14, 2009, at 11:35 AM, "Albert Gardner" <ibspud(at)roadrunner.com (ibspud(at)roadrunner.com)> wrote:
[quote]
I think I have my high oil temps problem under control finally. I previously
had added a high capacity oil cooler on the right side but still was seeing
temps climbing too high now that summer is upon us. I added 2
non-retractable cowl flaps on the bottom. The rectangular opening in the
cowl is 4 x 9 inches. The opening at the rear is 2 x 4 inches. They are
non-retractable because the mufflers would interfere. This seems to be a
final fix. I'll try it tomorrow with daytime temps at 111. Good thing KNYL
is at 216'.
Albert Gardner
Yuma, AZ
N991RV
<FILE0346 (Small).JPG>
<FILE0347 (Small).JPG>
scription,
www.matronics.com/Navigator?RV10-List" target="_blank">http://www.matronics.com/Navigator?RV10-List
ronics.com/" target="_blank">http://forums.matronics.com
Matt Dralle, List Admin.
=====
[b]
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Dick Sipp
Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI
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| Posted: Tue Jul 14, 2009 7:37 pm Post subject: High Oil temps |
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The recent hot weather has certainly provided a good test environment for our cooling issues.
I am running Van's oil cooler and the stock cowling outlets and a stock D4A5 with a single Lightspeed. I usually climb at 2600/full rich and 115 KIAS. Prior to this trip, in hot weather, I was seeing an occasional 400-410 on cyls 1 & 6. 1st. mod was to open the gap on the wrap around exit cylinder head baffles of 1 and 6 by about .500 inches. and I removed the right side front cylinder air dam.
This past week I departed Salt Lake City and climbed direct to 13,000 in ISA +35 conditions. Cyls 1 & 6 were running in the 390's. I have not had much of a problem with the oil temp. Under these conditions if I remember correctly it went to 190 ish in the climb and then back down to 180 in cruise.
I am still wrestling with fuel injector balance as the engine runs more rough than I would like at more than 20-30 LOP. At this high altitude and high temp I ended up running about 50 ROP to get the cyls all below 380.
Just another data point I guess.
Dick Sipp
N110DV 160 hours
[quote] ---
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Wed Jul 15, 2009 5:23 am Post subject: High Oil temps |
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Dick,
Can you fill us in...maybe with pictures, on what you mean about opening
the gap on the wrap around baffles. How did you loosen them without
them flapping, or what did you do? My CHT's are warmer in climb
on my new cylinders than the old. The new have tapered lower barrels,
and that meant that the wrap-around had an odd taper to it too. So,
I filled in the gap with RTV. I'm wondering about your opening the
gap, because maybe by my closing the gap that's where the added
heating is coming from. Would be nice to see what you did on
#1 and #6. I haven't switched back to Exxon Elite yet, so I
have been holding off doing anything drastic, as I think my temps
went down with that oil. I may have just tightened up things too
much though as when I put the new cylinders on I went to every
extreme getting the gaps sealed....maybe I just over did it.
Tim Olson - RV-10 N104CD
do not archive
richard sipp wrote:
[quote] The recent hot weather has certainly provided a good test environment
for our cooling issues.
I am running Van's oil cooler and the stock cowling outlets and a stock
D4A5 with a single Lightspeed. I usually climb at 2600/full rich and
115 KIAS. Prior to this trip, in hot weather, I was seeing an occasional
400-410 on cyls 1 & 6. 1st. mod was to open the gap on the wrap around
exit cylinder head baffles of 1 and 6 by about .500 inches. and I
removed the right side front cylinder air dam.
This past week I departed Salt Lake City and climbed direct to 13,000 in
ISA +35 conditions. Cyls 1 & 6 were running in the 390's. I have not
had much of a problem with the oil temp. Under these conditions if I
remember correctly it went to 190 ish in the climb and then back down to
180 in cruise.
I am still wrestling with fuel injector balance as the engine runs more
rough than I would like at more than 20-30 LOP. At this high altitude
and high temp I ended up running about 50 ROP to get the cyls all below 380.
Just another data point I guess.
Dick Sipp
N110DV 160 hours
---
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Wed Jul 15, 2009 5:41 am Post subject: High Oil temps |
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Speaking of what you did there with the cowl opening, I did
a little playing a while back and although the data isn't
really good data, I do have a theory....
The standard Van's Louvres don't stick out at all. My thought
was that the fast moving air coming by the lower cowl was
keeping the boundary layer too tight to the existing louvres,
not giving the air inside any real good path to get out...
almost making a "wall of air". (of course it may be causing
a slight low pressure...it should, I'd think) So what I did
was to stick on with aluminum tape a couple of homemade vortex
generators in front of the louvres. My theory was it would
create a lower pressure disturbance and give the Van's
louvres a little help by creating some suction to pull
that warm air out. It isn't reliable measured data, but
I think I did see a decrease of a few...maybe up to 10
degrees. That kind of sounds like how the effect of James
McGrew's would be, too...I haven't seen photos but if he
put additional louvres (the normal raised kind) in front
of the Van's Louvres, maybe they would not only increase
the exit area, but decrease the pressure in that area to
assist getting rid of the cowl's internal hot air.
It was just a thought...not sure how valid.
Tim Olson - RV-10 N104CD
Albert Gardner wrote:
| Quote: | I think I have my high oil temps problem under control finally. I previously
had added a high capacity oil cooler on the right side but still was seeing
temps climbing too high now that summer is upon us. I added 2
non-retractable cowl flaps on the bottom. The rectangular opening in the
cowl is 4 x 9 inches. The opening at the rear is 2 x 4 inches. They are
non-retractable because the mufflers would interfere. This seems to be a
final fix. I'll try it tomorrow with daytime temps at 111. Good thing KNYL
is at 216'.
Albert Gardner
Yuma, AZ
N991RV
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Dick Sipp
Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI
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| Posted: Wed Jul 15, 2009 7:14 pm Post subject: High Oil temps |
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On Wednesday, July 15, 2009 9:23 AM Tim wrote:
Can you fill us in...maybe with pictures, on what you mean about opening
the gap on the wrap around baffles........
I'll try to get a couple of pictures but won't be back at the airport until
after the weekend.
What I am trying to describe is the portion of the cylinder baffle below the
cylinder (where the cooling air exits) around the top portion of the
cylinder. This is the part of the baffle that small diameter rod or safety
wire goes through on the front of the front cyl and back of the back
cylinder on each side. To open them the rod is removed and bent tab is
rebent to make the opening a little bigger and a new hole drilled for the
rod.
This process was described in an old book by Ken Pazer "speed with
efficiency". He experimented with various size openings to minimize cooling
drag.
The idea is opening this exit channel allows more air to flow around that
cylinder, think of an individual cylinder cowl flap.
Did you replace your cylinders already?
Dick
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Wed Jul 15, 2009 7:36 pm Post subject: High Oil temps |
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Ahh, that makes sense. So you're giving maybe a higher volume of flow
through there, even though it all doesn't hit the fins....it may
encourage more free flowing. Interesting. Mine is sealed up
really tight down there....I even RTV'd the gaps to make sure the
exit was ONLY through the fins...maybe I need to look at that a
little.
Yes, I had the ECI cylinders affected by the A.D. that required
the repetitive inspections and pressure tests, and at the time
they had a really good deal to just swap yours out for new ones
that weren't affected. I couldn't resist, since I had almost
400 hours on them already. I figured I could eliminate the
A.D. / S.B. worries and future possible headaches and just get
a new improved set. Turns out it was great timing because once
the economy tanked they withdrew the offer, so I was lucky to
get them when I did. It was a good learning experience to
change them all too...I feel much more comfortable working
on the engine.
Tim Olson - RV-10 N104CD
do not archive
richard sipp wrote:
| Quote: |
On Wednesday, July 15, 2009 9:23 AM Tim wrote:
Can you fill us in...maybe with pictures, on what you mean about opening
the gap on the wrap around baffles........
I'll try to get a couple of pictures but won't be back at the airport
until after the weekend.
What I am trying to describe is the portion of the cylinder baffle below
the cylinder (where the cooling air exits) around the top portion of the
cylinder. This is the part of the baffle that small diameter rod or
safety wire goes through on the front of the front cyl and back of the
back cylinder on each side. To open them the rod is removed and bent
tab is rebent to make the opening a little bigger and a new hole drilled
for the rod.
This process was described in an old book by Ken Pazer "speed with
efficiency". He experimented with various size openings to minimize
cooling drag.
The idea is opening this exit channel allows more air to flow around
that cylinder, think of an individual cylinder cowl flap.
Did you replace your cylinders already?
Dick
|
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kevino(at)WorldWarehouse.
Guest
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| Posted: Thu Jul 16, 2009 8:23 am Post subject: High Oil temps |
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I had identical issue with my Glastar. Cleaned out RTV and spaced the baffle with one washer. Dropped the CHT over 30 degrees on #3 cyl. Will soon see if RV 10 has temp issues.
[quote][b]
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