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Date: Sat, 20 Aug 2005 21:32:37 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oil Cooler Connections
Message-Id: <20050820213237.523e1be0.bob@bob-white.com>
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Hi Finn,

Thanks for the photo.  I'm planning on going from the front cover to
the oil cooler, then to the oil filter.  Mainly because if there's
anything in the oil cooler, the filter will catch it before it goes
thru the engine.  The old oil filter pad has been machined off, so I
just have an AN-10 fitting into the rear cover for the return oil from
the filter.  At least my remote oil filter mount is marked for in and
out so I don't have to guess about that.  There are also a couple of
extra in and out ports that give me a place to put the pressure and
temperature sensors.  I'm putting the pressure on the output and the
temp on the input to the filter.  That way I will see a drop in oil
pressure if the filter starts getting restricted.

Bob W.


On Sat, 20 Aug 2005 23:10:13 -0400
Finn Lassen <finn.lassen@verizon.net> wrote:

> This is the way I have it. When changing oil I obviously don't get to=20
> change all the oil. Whatever is in the cooler stays there. Don't see=20
> much of a problem with that.
> I have my oil filter mounted directly on front cover output, then a line=
=20
> to what is the right side of the cooler in the attached picture and then=
=20
> out front and back up to the engine oil inlet. I have the usual home=20
> made bypass plate with pressure and temp senders mounted on the pad=20
> where the filter normally goes. Pretty simple (read "light") setup.
>=20
> On Tracy's warning I purchased a new thermostat from Mazda. Of course=20
> that didn't save me from frying all bearings because of no oil pressure.=
=20
> Didn't know there were specific in and outputs on oil filters. Oil=20
> leaves the oil filter through the center hole. If you didn't notice the=20
> membrane covering the filter outlet holes, there was a certain logic to=20
> think that oil would enter through center hole and push the filter paper=
=20
> out towards the oil filter can - but that's wrong.
>=20
> Finn
>=20
> Bob White wrote:
>=20
> >Hi Thomas,
> >
> >This may be a problem.  That's how I thought it was going to be when I
> >was thinking it went the other way, but now I would have to turn the
> >cooler upside down. Doing so will make the inlet hose stick out thru the
> >bottom of the cowl.  Very incovenient for routing the plumbing.
> >Mounting this oil cooler has been a major pain in the behind.  Come to
> >think of it, my biggest problems have been plumbing.
> >
> >I may have to try it Ed's way and run the oil thru backwards if I can
> >convince myslef that I won't have a thermostat problem.
> >
> >Bob W.
> >
> >
> >
> >On Sat, 20 Aug 2005 14:17:59 -0500
> >"rijakits" <rijakits@cwpanama.net> wrote:
> >
> > =20
> >
> >>Bob,
> >>
> >>just ot make sure, whatever position you mount the cooler, do it so tha=
t any
> >>gas (trapped air, oil vapor, etc.) can be pushed out in FLOW-Direction,=
 not
> >>against it. Also make sure that the outlet is at the highest spot, even=
 if
> >>you have to mount the cooler a little crocked (un-estetic, but works!).
> >>I remember some 20 years back BMW started to offer oil-coolers on their
> >>bikes. Lots of them had trouble with oil-temp after oil-changes:
> >>Oil would drain out of the cooler - oil-pump starts to load the cooler =
and
> >>in the process trapps a good amount of air - inlet and outlet where fac=
ing
> >>down for more estetic oil line routing (or cheaper, shorter lines :)).
> >>Easiest fix was to mount the cooler up-side down, get 180=BA fittings a=
nd
> >>mount the cooler lower so the orignal lines would fit - no more trapped=
 air
> >>as it was pushed out the outlet as the cooler filled up.
> >>I believe the coolers were single pass.
> >>
> >>Thomas J.
> >>
> >>
> >>----- Original Message -----=20
> >>From: "Bob White" <bob@bob-white.com>
> >>To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> >>Sent: Saturday, August 20, 2005 1:25 PM
> >>Subject: [FlyRotary] Re: Oil Cooler Connections
> >>
> >>
> >>   =20
> >>
> >>>Thanks Ed (and Al also),
> >>>
> >>>I was just writing a reply to Al give a little more detail, but his
> >>>observation seems to have been correct.  I thought the nut on the
> >>>bottom might have something to do with the thermostat that I thought
> >>>the stock Mazda coolers had.  Did you remove or disable the thermostat
> >>>or, am I mistaken in thinking it has one?
> >>>
> >>>One other question that concerns me a little, I was told by Racing Beat
> >>>when I ordered the AN adaptors, that the Mazda cooler had a 16 MM and
> >>>an 18 MM fitting like the front and rear covers.  This cooler (from
> >>>Bruce T.) has two 18 MM threads.  Does the manual mention the thread
> >>>sizes?
> >>>
> >>>Bob W.
> >>>
> >>>
> >>>On Sat, 20 Aug 2005 14:12:51 -0400
> >>>"Ed Anderson" <eanderson@carolina.rr.com> wrote:
> >>>
> >>>     =20
> >>>
> >>>>Bob,   I just checked the Mazda manual and it clearly shows the inlet
> >>>>       =20
> >>>>
> >>(oil
> >>   =20
> >>
> >>>>from engine oil pump) is the top fitting and outlet (to inlet on rear
> >>>>housing)  the side fitting.  Now for what its worth I mistakenly hook=
ed
> >>>>       =20
> >>>>
> >>mine
> >>   =20
> >>
> >>>>up as your labels indicate - then later realized my mistake - but, si=
nce
> >>>>       =20
> >>>>
> >>the
> >>   =20
> >>
> >>>>oil temps and pressures were fine, I never changed it to the correct
> >>>>direction.
> >>>>
> >>>>Ed
> >>>>
> >>>>
> >>>>       =20
> >>>>
> >
> > =20
> >
>=20


--=20
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