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billz
Joined: 08 Jul 2009
Posts: 26
Location: Clinton, New York
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 Posted: Sun Aug 07, 2011 1:40 pm Post subject: Oil Cooler mount |
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I know this topic has been discussed at length, but am looking for guidance from some of those who've done it. I'm working the fuselage and finish kit (and a little of the firewall forward) at the same time. I'm not pleased with the airflow with the standard Vans oil cooler mount, but am leaning towards using it with modifications.
Based on forum discussions, I purchased the 2006X oil cooler and have their fiberglass plenum. I intended to make my own mount with the fiberglass plenum, to improve airflow, but am not doing well. I'd like to mount the oil cooler horizontally so the airflow is directly into and out of the oil cooler. I made a flange that attaches to the cooler, but can't come up with any mount designs that seem to work. I can use the standard mounting holes and configure a bracket that will be attached with it, but I don't like the idea of having the bracket support the cooler with tension loads on all the components. The cooler will fit horizontally in that area, but will be at the bottom of all the standard mounting holes. I can see some durability issues down the road. I could move the whole thing to the other side of the engine, but don't really want to take up space over there. It could be mounted on the baffle, but that will add stress on the baffle and perhaps cause fatigue cracking. After all this, I'm back to using the improved cooler with the Vans mount.
I seem to remember seeing some mounts that had an added deflector installed inside the "V" box to provide better air distribution onto the cooler. This makes a lot of sense that a small louver could direct part of the air flow onto the top part of the cooler and make better use of the cooling surface in the upper part of the oil cooler. I could make one, but if someone else has already done it, I'd rather just buy it. If anyone knows if someone has an oil cooler air deflector for sale, please let me know.
It seems that I talk with many who have no problems with the standard design and I'm thinking that some effort put into sealing the baffles and oil cooler box and ducting may be all that's needed.
I'd appreciate any comments you folks may have on my dilemma.
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pitts_pilot(at)bellsouth.
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| Posted: Sun Aug 07, 2011 2:00 pm Post subject: Oil Cooler mount |
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As I posted earlier, I have a friend with an RV-7 with high oil temps.
As I look at the cooler installation on his airplane, the air out of the
cooler dumps down into the corner of the cowl, where there is no real
airflow out the ramp. the other observation I have made is that the
differential pressure across the oil cooler is the same as the
differential across the cylinders as the oil cooler is in parallel.
Also, the square inches of the cooler is larger than the scat tubing
supplying the air.
I plan on making a plenum since I hate cowl seals.
So, two areas that may help: A larger scat tube to the cooler, and a
scat tube from the output of the cooler over to the ramp.
That experiment on the RV-7 is in process.
Linn
On 8/7/2011 5:40 PM, billz wrote:
| Quote: |
I know this topic has been discussed at length, but am looking for guidance from some of those who've done it. I'm working the fuselage and finish kit (and a little of the firewall forward) at the same time. I'm not pleased with the airflow with the standard Vans oil cooler mount, but am leaning towards using it with modifications.
Based on forum discussions, I purchased the 2006X oil cooler and have their fiberglass plenum. I intended to make my own mount with the fiberglass plenum, to improve airflow, but am not doing well. I'd like to mount the oil cooler horizontally so the airflow is directly into and out of the oil cooler. I made a flange that attaches to the cooler, but can't come up with any mount designs that seem to work. I can use the standard mounting holes and configure a bracket that will be attached with it, but I don't like the idea of having the bracket support the cooler with tension loads on all the components. The cooler will fit horizontally in that area, but will be at the bottom of all the standard mounting holes. I can see some durability issues down the road. I could move the whole thing to the other side of the engine, but don't really want to take up space over there. It could be mounted on the baffle, but that will add stress on the baffle and perhaps cause fatigue c!
racking. After all this, I'm back to using the improved cooler with the Vans mount.
I seem to remember seeing some mounts that had an added deflector installed inside the "V" box to provide better air distribution onto the cooler. This makes a lot of sense that a small louver could direct part of the air flow onto the top part of the cooler and make better use of the cooling surface in the upper part of the oil cooler. I could make one, but if someone else has already done it, I'd rather just buy it. If anyone knows if someone has an oil cooler air deflector for sale, please let me know.
It seems that I talk with many who have no problems with the standard design and I'm thinking that some effort put into sealing the baffles and oil cooler box and ducting may be all that's needed.
I'd appreciate any comments you folks may have on my dilemma.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=348848#348848
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robin(at)PaintTheWeb.com
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| Posted: Sun Aug 07, 2011 2:17 pm Post subject: Oil Cooler mount |
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Linn,
Are you flying with your wheel pants on your 7? The reason I ask is we
goofed around with all different oil cooler locations and feed lines but
had 220 oil temps no matter what we did (RV-8A). Then we got to the point
during Phase 1 where we added the gear leg fairings & wheel pants. We
gained 14 knots TAS and now my oil never climbs above 205 and settles in
under 200 during 90+ OAT's. We feel really stupid wasting all that time
plus R&D when all we needed to do was to keep adding the required bits &
pieces.
I need to get away from this computer on a beautiful Sunday afternoon.
Good luck,
Robin
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pitts_pilot(at)bellsouth.
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| Posted: Sun Aug 07, 2011 2:27 pm Post subject: Oil Cooler mount |
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Actually, I'm not flying .... still building ...... which is a good
thing since all the 'gotchas' should be solved by then!!! 
I'll pass your comment on to my buddy though!!!
Linn
On 8/7/2011 6:14 PM, Robin Marks wrote:
[quote]
Linn,
Are you flying with your wheel pants on your 7? The reason I ask is we
goofed around with all different oil cooler locations and feed lines but
had 220 oil temps no matter what we did (RV-8A). Then we got to the point
during Phase 1 where we added the gear leg fairings& wheel pants. We
gained 14 knots TAS and now my oil never climbs above 205 and settles in
under 200 during 90+ OAT's. We feel really stupid wasting all that time
plus R&D when all we needed to do was to keep adding the required bits&
pieces.
I need to get away from this computer on a beautiful Sunday afternoon.
Good luck,
Robin
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carl.froehlich(at)verizon
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| Posted: Sun Aug 07, 2011 3:16 pm Post subject: Oil Cooler mount |
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Just did the final mount of my oil cooler today. Photo attached. Photo was
taken before I added an Adel clamp and piece of angle to attach the forward
bottom flange of the cooler to the adjacent engine mount pipe. This forward
hard point is needed to prevent flexing of the cooler flanges if you just
had it attached only to the firewall. The two pieces of .063 angle are
attached on their inboard ends to the left tunnel vertical bulkhead angle.
I used Adel clamps for the outboard support attach points as there is no
good firewall support angle in that area.
Carl
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pilotdds(at)aol.com
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| Posted: Sun Aug 07, 2011 8:01 pm Post subject: Oil Cooler mount |
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very clever
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