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03-18-2016, 10:13 PM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Oil Cooler Mounting
Need some advice from the wizards! I have cut the rear baffle for the oil cooler and drilled the 705A for nutplates, etc. The lower inboard nutplate is in contact with a cooling fin. If I insert a bolt and get 1 thread showing, it contacts the cooling fin enough to slightly push the baffle to the rear. My question--is it ok to grind a small relief in the cooling fin? If not, looks like I will need to re-order parts and start again in this area. If I raise the oil cooler enough to clear the fin, I am getting real close to contacting the cowl. Thanks in advance. Baffles--blah!
[IMG]  [/IMG]
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03-18-2016, 10:17 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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Me too
Awaiting an answer to your concern. I'm building that very part tonight.
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03-19-2016, 05:04 AM
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Join Date: Jan 2005
Location: KPYM
Posts: 2,686
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I don't recall having this problem. Perhaps my cooler was mounted higher?
You say that the oil cooler would be real close to the cowling if you raised it. Well, that is where you want it for best cooling.
I say raise it.
My two...
 CJ
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03-19-2016, 05:31 AM
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Join Date: Feb 2005
Location: Chesterfield, Missouri
Posts: 4,514
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Can not answer your question right now but will be pulling cowl for condition inspection soon and will check it out for you if no one else does before then.
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03-19-2016, 06:54 AM
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Join Date: Mar 2008
Location: houston, texas
Posts: 900
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Your fine.
Quote:
Originally Posted by skyking902001
Need some advice from the wizards! I have cut the rear baffle for the oil cooler and drilled the 705A for nutplates, etc. The lower inboard nutplate is in contact with a cooling fin. If I insert a bolt and get 1 thread showing, it contacts the cooling fin enough to slightly push the baffle to the rear. My question--is it ok to grind a small relief in the cooling fin? If not, looks like I will need to re-order parts and start again in this area. If I raise the oil cooler enough to clear the fin, I am getting real close to contacting the cowl. Thanks in advance. Baffles--blah!
[IMG]  [/IMG]
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Most of us move that inside lower hole not on the baffle so much as on the flange of the cooler. I made a new lower hole up about 3/4 to one inch higher on that side so when it was driller to the baffle it would just clear the jugs fins. There is a spec. in most of the engine makers books to loose a few fins from breakage. Most builders don't like trimming a little off a fin, but if it is done well there is little effect to cooling if it is a small repair sight. On the subject of moving the cooler up a bit, yes we found that if you locate it up as high and out as you can, you can get a 9 row cooler to fit where the Van's 7 row is dawn-up to go by the plans. We have an ECI IOX-360 that the factory spec called out at 191 Bhp., but we worked on it a little and have it up about 2% from there. The 9 row cooler handles the extra heat load very well, even with all 8 oil spray nozzles installed. We found that 3/8" gap between the upper cowl and the top left corner of the cooler was all that was needed. I would do it anyway you like at this point, your on the right track with this one.
Hope this helps, Yours as always, R.E.A. III #80888
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03-19-2016, 06:59 AM
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Join Date: Mar 2008
Location: houston, texas
Posts: 900
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Your fine.
Quote:
Originally Posted by skyking902001
Need some advice from the wizards! I have cut the rear baffle for the oil cooler and drilled the 705A for nutplates, etc. The lower inboard nutplate is in contact with a cooling fin. If I insert a bolt and get 1 thread showing, it contacts the cooling fin enough to slightly push the baffle to the rear. My question--is it ok to grind a small relief in the cooling fin? If not, looks like I will need to re-order parts and start again in this area. If I raise the oil cooler enough to clear the fin, I am getting real close to contacting the cowl. Thanks in advance. Baffles--blah!
[IMG]  [/IMG]
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Most of us move that inside lower hole not on the baffle so much as on the flange of the cooler. I made a new lower hole up about 3/4 to one inch higher on that side so when it was driller to the baffle it would just clear the jugs fins. There is a spec. in most of the engine makers books to loose a few fins from breakage. Most builders don't like trimming a little off a fin, but if it is done well there is little effect to cooling if it is a small repair sight. On the subject of moving the cooler up a bit, yes we found that if you locate it up as high and out as you can, you can get a 9 row cooler to fit where the Van's 7 row is dawn-up to go by the plans. We have an ECI IOX-360 that the factory spec called out at 191 Bhp., but we worked on it a little and have it up about 2% from there. The 9 row cooler handles the extra heat load very well, even with all 8 oil spray nozzles installed. We found that 3/8" gap between the upper cowl and the top left corner of the cooler was all that was needed. I would do it anyway you like at this point, your on the right track with this one.
Hope this helps, Yours as always, R.E.A. III #80888
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03-19-2016, 08:42 AM
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Join Date: Oct 2009
Location: Gunter, TX
Posts: 314
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Robert, thanks so much for the reply. Never thought about just raising the nutplate--duh! For the lower nutplate, I plan to use the existing upper rivet hole as the lower rivet hole for a miniature nutplate. This should result in raising the bolt hole by .6", this should be adequate to clear the fin. Thanks again!
Steve
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03-19-2016, 01:41 PM
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Join Date: Feb 2011
Location: Germany
Posts: 443
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Not long ago I installed a 9row cooler on my RV-8. I was only able to bolt the cooler with just one bolt on the inner (right) flange of the cooler. I made a brace to the lower part of the flange from this bolt to regain some rigidity. Didn?t have the idea to relocate the holes on the flange - good idea!
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03-21-2016, 04:33 PM
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Join Date: Apr 2013
Location: Redding, Ca.
Posts: 274
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There's an easy solution for that problem. If you haven't found a good answer yet, give me a call one evening and I can explain to you how I've delt with the same issue on quite a few RV's.
Rex
530-396-2239
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03-21-2016, 10:12 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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Quote:
Originally Posted by R. Daniels
There's an easy solution for that problem. If you haven't found a good answer yet, give me a call one evening and I can explain to you how I've delt with the same issue on quite a few RV's.
Rex
530-396-2239
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Share it with the rest of us?
__________________
Blain
R-22 sold.
RV-8 AW Cert 02-09-17
N82 Sierra Tango
Avatar courtesy of AircraftStickers.com!
Dues gladly paid thru Nov. 2020(my reminder ).
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