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1. 08:33 AM - Oil Coolers (Bill Judge)
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Yikes! Glad that hasn't happened to me!
I've been blissfully running around for 900 or so hrs.
I did a little looking around and it's been said that the SWs are tested to
180 PSI(off of VAF) and the Setrabs from what I can find are only tested to
145 PSI, max operating pressure is 174 PSI and design limit pressure is 536
PSI.
http://www.setrab.com/products/proline/technical-specifications/std/
1 Bar = 14.5 Psi.
So 90 PSI shouldn't have been a problem but evidently it was. There is also
some speculation that on startup Lyc Oil pressure surges very high, I could
see this especially when it's cold. I'm in SoCal now but I was in DC for 4
years before that and started up on some 10 F mornings with no issues.
I run about 72 PSI, 60 PSI would be better. Recommended range is 50-95 PSI
according to the vantage engine manual which is pretty much the XP-360 that
I have.
Did it fail where the lines connect? Do you think there was any binding?
I hadn't thought about the airflow difference. I've got 1/2 of it taped
over anyway so it probably doesn't much matter.
Bill
>
>
> Time: 08:39:51 PM PST US
> Subject: RV-List: Re: Oil Coolers...
> From: "Laird" <owens.laird@gmail.com>
>
>
> Gary mentioned a failure in the past of the setrab oil cooler. That was
> me back
> in June 2000. There was a bunch of discussion then about it then. Would
> recommend
> searching that time frame in the archives. I'll copy my original post.
>
> Personally, I wouldn't recommend anyone to use one, but that's the great
> thing
> about homebuilts. You can do whatever YOU want.
>
> Laird
> (and yes, I shouldn't have over flown a perfectly good airport, but that's
> what
> I did as the oil temp and pressure were still in the green).
>
> >From June 2000
>
> #67570
> Date: Jun 02, 2000
> From: "Owens, Laird"
> Subject: Setrab Oil Cooler Failure (long)
>
> Hi all,
>
> Yesterday on the 3rd flight of my RV-6, I had an interesting thing happen.
> I was
> out to break in my new 0-360 (and have a little fun) and out about 30nm
> from
> the departure airport, 5500', 2550 rpm just cruising along about ready to
> turn
> for a run back. I was going to do this back and forth thing for 2 hours to
> let the motor work a little.
>
> I have a 16 row Setrab oil cooler mounted behind the #4 cyl on the baffle.
> Setrab
> oil coolers had been recommended in the past as a low cost alternative to
> S/W's (see post from archives below). Oil temps have been consistent at
> 225 deg
> F (75 deg F ambient at 0 MSL). I was hoping that would come down a little
> once
> the engine broke in. Oil pressure had been stable at 90 psi.
>
> Just before I was going to turn, with about 3 hrs total on the tach, I
> noticed
> a little puddle of oil on the floorboard in front of the rudder peddles.
> That's
> weird.....I don't have any oil lines in under the dash.....OH @#$@! Oil
> must
> be leaking in the engine compartment and seeping thru the wire pass thru's.
> I looked up just in time to see oil starting to come out of the upper
> cowling
> at the fuse/cowl junction. Oil pressure had dropped 5 psi, but was stable,
> and temp was still 225. First, pull the power to 1800 and think.
>
> OK....decision time. I was just north of Valencia, about 15nm from
> Whiteman or
> Van Nuys, and about 17nm out of Santa Paula (gawd I love that GPS). Lots
> of
> houses between me Whiteman, and a river bed between me and Santa
> Paula.....let's
> see, if the engine fails, I can land on a house, or a river bed. That's a
> no brainer. And if I can make Santa Paula, Camarillo is just around the
> corner.
> Maybe I can make it all the way back to home base......
>
> I keep the power low, watch the oil pressure and temp and head for Santa
> Paula
> decending at about 200 fpm to keep the speed up while the motors still
> running.
>
> I pass over Santa Paula at 2500' with good oil pressure so I decide to
> press on
> to Camarillo. Tower was helpful getting me on the ground quickly without
> having
> to declare the "E" word.
>
> I taxied back to the hangar and shut down. I climbed out to find oil
> dripping
> from the lower firewall to the tailwheel, on the side of the fuse and on
> the wing
> root and no oil on the dipstick. Guess it lost a little more oil than I
> thought,
> duh. What a mess in the "engine compartment formally know as clean".
>
> I pulled the cowl and cleaned up the airplane up (I'm sure the EPA would
> like to
> talk to me bout now....).
>
> The oil lines were tight, that only leaves the oil cooler. Pulled that
> and put
> an air nozzle to it. Sounds like a big hole up where the tubes get welded
> to
> the main plenum.
>
> Hello, Van's......Can I order a Positech oil cooler and have it delivered
> over
> night? Thank you.
>
> So much for trying to save a couple of bucks on the cooler.
>
> Just thought anyone out there with one of these might like to know about
> it. I
> hadn't seen any failure reports in the archives.
>
> Laird RV-6 (with a well lubed paint job)
> SoCal
>
> >From the Archives:
>
> From: Mlfred(at)aol.com
> Subject: Re: Oil cooler location & low cost option
> Hi all:
>
> PLEASE don't think you need one of those expensive coolers on your bird!
> Rob
> Lee will tell you, and so will I.
> I use a small & inexpensive ($65) cooler (with male -8 AN fittings already
> installed) from TMR, Inc in Orange, Calif. (714) 771-1348. Talk to Mike
> and
> tell him I sent you ( he'll only charge you an extra 10%). The 19 row ($70
> "Setrab" brand- malmo in Sweden) unit I use on my Rocket keeps the temps on
> the 540 to 185F in cruise, and I think I used a 13 row on the -4, and it
> was
> usually too much. Rob Lee has the exact part # for the 320/360 unit. How
> about posting it, along with installation tips, Rob?
>
> I mounted mine on the back baffle, on the left side. I used the
> expanding-slowing air/increasing pressure idea, and the inlet to the cooler
> is sort of a reverse funnel.
>
> Check six!
> Mark Frederick
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=421186#421186
>
>
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