From: "Steven W. Boese SBoese@uwyo.edu" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: OIL
Thread-Topic: [FlyRotary] Re: OIL
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Date: Wed, 27 Jun 2018 17:37:48 +0000
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My test stand has a series 2 Renesis and my flying RV6A has a 1986 13B.  Oi=
l cooling was found unsatisfactory at flight power levels with both systems=
 when RX7 oil coolers were used.  On the test stand, various oil cooler con=
figurations were tested.  The same AC evaporator core as used for coolant r=
adiators was found to have less oil pressure drop but oil temperatures were=
 still too high.  Two RX7 coolers were connected in parallel but were still=
 restrictive to oil flow.  The two RX7 coolers were converted to single pas=
s but were still restrictive to oil flow even when connected in parallel.  =
A water jacket was welded to an RX7 cooler thus converting it to an oil to =
coolant exchanger.  Oil temperatures were still too high with this setup wh=
ich suggested to me that the heat exchange on the oil side of the RX7 coole=
r core was the limiting factor.  A Fluidyne DB-30617 cooler with damaged fi=
ttings was purchased on Ebay.  AN 10 male fittings were welded on replacing=
 the original damaged AN 12 ones.  Installing this cooler on the test stand=
 resulted in much lower pressure drop across the core along with much impro=
ved oil temperatures.  It was only at this point that the expen$ive new Flu=
idyne DB-30618 was purchased and installed in the plane.  The positive resu=
lts of this change has already been discussed.

A Fluidyne oil to coolant exchanger (they only sell one model of these that=
 I know of) was then installed in the plane with good results.  The oil to =
air cooler was reinstalled purely to retain the redundancy of oil and coola=
nt as cooling systems.

Steve Boese

> On Jun 26, 2018, at 9:40 PM, Andrew Martin andrew@martinag.com.au <flyrot=
ary@lancaironline.net> wrote:
>=20
> Steve, that sounds same size cooler that I had, was out of a 20b twin tur=
bo cosmo car, pretty sure those cars were only sold by mazda in Japan & Aus=
 being RHD
> That cooler tricked me as it would allow enough oil through to give rated=
 pressure on gauge, but only at low power would cool, as soon as flight was=
 attempted oil overheated quickly and took long time to cool down, second c=
ooler was same frontal area but 75mm thick, better as would cool hot oil do=
wn faster but again only at low power. Over 60 psi pressure drop at rpm, bu=
t could have been more as that was max of 140psi gauge I had.
> I would highly recommend hooking in a temporary pressure gauge (200psi) p=
rior to the cooler to check its pressure drop, you may be surprised how lit=
tle rpm you need to build pressure.
> ARE & PWR both in brisbane are only Aus companies I have found to help an=
d getting me quote on coolers similar to Fluidyne. If you want Fluidyne you=
 need third party (someone possibly going to Oshkosh) to carry it back as t=
hey will not ship to us.
> But saying all this you have the series 2 renesis which has different oil=
 setup to all other rotaries, Steve B has same so think his setup would be =
very relevant to you.
> Andrew