Received-SPF: pass
 receiver=logan.com; client-ip=205.152.59.66; envelope-from=atlasyts@bellsouth.net
Mime-Version: 1.0 (Apple Message framework v752.2)
In-Reply-To: <list-2159248@logan.com>
References: <list-2159248@logan.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Message-Id: <50E25C97-4332-48EA-B740-65740026666C@bellsouth.net>
Content-Transfer-Encoding: 7bit
From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Oil Cooler Hook up: [Fwd: [Fwd: RV-7A Cooling]]
Date: Thu, 5 Jul 2007 08:10:52 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Ed, this is a standard 2 gen oil cooler like the one I used.
looks like he added the port on the high side.
Buly

On Jul 5, 2007, at 7:18 AM, Mark Steitle wrote:

> Good catch ED.  After looking at the first of the two pictures  
> again, it appears that the line in question feeds into the oil  
> filter adapter block, thereby bypassing the oil filter and half of  
> the oil cooler.  My guess is that its purpose was to keep air from  
> being trapped in the top of the oil cooler.  Of course, you pointed  
> out a couple of other things it may be doing as well.  While it may  
> not completely solve his oil temp problems, removing & plugging the  
> line should bring his oil temps down by at least a few degrees.  It  
> shouldn't be too difficult to test that theory.
>
> Mark St.
>
>
>
> On 7/5/07, Ed Anderson <eanderson@carolina.rr.com> wrote: Good  
> catch, Buly.
>
> Both oil fittings (in and out) are on the same end of the oil  
> cooler if its
> a stock Mazda RX-7 Oil cooler.  I see what Buly means - there is also
> appears to be an AN-8  hose out the other (top) end of the oil  
> cooler. You
> do not mention this hose in your description of your oil system.
>
> I guess that could be unique to the Cosmo oil cooler (if that is  
> what you
> are using)  not  having   seen one myself, but the small top hose  
> looks like
> an add-on to the oil cooler core.
>
> However, the bottom line is -- IF your oil line to your oil filter  
> and the
> hose out of the top of the oil cooler to your block do provide a  
> parallel
> path for the oil to return to the block , then I can see two   things
> resulting - neither very good:
>
> 1.  The top hose (one next to prop flange) on the cooler would  
> appear to
> permit oil to leave the cooler after only passing through one or  
> two rows of
> the cooler - therefore not loosing very much heat to the air.  So  
> 20-30% (or
> more) of your oil may not be  flowing through all rows of the  
> cooler.  IF
> true then that would make a major difference in oil temps and no  
> amount of
> air flow through the cooler will really help much.
>
> 2. Some of your oil will not be flowing through your oil filter and  
> you will
> therefore have some "dirty" oil flowing through your cooler and  
> returning
> directly to the engine.
>
> If this is a Cosmo oil cooler for a 3 rotor, then Buly is correct,  
> it should
> have no problem cooling a two rotor.
>
> So its possible that the combination of some oil by-passing the  
> cooler (If
> indeed that is the case) and insufficient cooling air through the  
> oil cooler
> could both be playing a part in your high oil temps.
>
> So exactly how is your oil system set up?  What is the purpose of  
> the hose
> coming out of the top of the oil cooler(end closest to the prop  
> flange)?
>
> Ed
>
>
>
>
>
> ----- Original Message -----
> From: "Bulent Aliev" <atlasyts@bellsouth.net >
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Wednesday, July 04, 2007 9:40 PM
> Subject: [FlyRotary] Re: [Fwd: [Fwd: RV-7A Cooling]]
>
>
> > Dennis,
> > I used the same oil cooler on my Cosmo 13B and it was cooling  
> too  much in
> > flight 137F at cruise.
> > I see one thing you have done that disturbs me. The oil line  
> tapped  at
> > the high end of the oil cooler going into the oil filter adapter   
> plate..
> > By doing this, great percentage of the oil is bypassing the  oil  
> cooler
> > core and going back into the block.
> > If it was me I'll block this outlet, and turn the oil cooler  
> around,  so
> > the oil gets in and out at the higher end. This will prevent an   
> air lock
> > at the high end.
> > Buly
> > On Jul 4, 2007, at 6:44 PM, Dennis Haverlah wrote:
> >
> >>
> >>
> >>
> >> Flew my RV yesterday with OAT of 83 deg F - should have cooled   
> really
> >> well - No Joy!!  The water was OK but the oil cooling just  does  
> not
> >> appear to cool any better after all the duct/air flow   
> improvements.  The
> >> wedge oil pan did not help either- I guess I did  not have oil  
> foaming
> >> after all.  My oil level in the wedge pan is  3/4 inch below the  
> 1/2 inch
> >> aluminum mounting plate.  Now I'm  wondering if my oil system is  
> too flow
> >> restrictive.  My oil  pressure only reaches 85 psi when the oil  
> is cool
> >> and when I'm  flying it goes to the lower 60's.  Oil pressure is  
> measured
> >> on the  adaptor plate where the oil returnes to the engine.
> >>
> >> My oil system is as follows:  I come out of the normal oil  
> outlet -  (I
> >> have not tapped the lower galley and plumbed the  oil outlet   
> there) -
> >> with an An - 10 line to the Mazda (89?) oil cooler.  After  the oil
> >> cooler, I use An-8 hose from the oil radiator to an  aftermarket  
> oil
> >> filter housing with the K&N HP 1002 oil filter.     From the oil  
> filter I
> >> use An-8 hose to go to the adaptor block on  the enigne.  Two  
> pictures of
> >> the oil system are attached.  The  attached pictures are early  
> pictures
> >> before the wiring etc. was in  flight ready condition.
> >>
> >> The oil cooler is clean and I've removed and checked the oil by-  
> pass
> >> thermostat in hot water - it opened at or below 160 Deg F.   
> Anyone know
> >> of an easy and accurate way to determine if it is  working  
> properlly -
> >> maybe check temps. at both ends of the oil  radiator as the  
> engine and
> >> oil heats up.  Also,  is there an easy  way to remove the oil  
> thermostat
> >> and seal the bypass hole?
> >>
> >> <003_3 (Small).JPG>
> >> <011_11 (Small).JPG>
> >> --
> >> Homepage:  http://www.flyrotary.com/
> >> Archive and UnSub:   http://mail.lancaironline.net:81/lists/
> >> flyrotary/List.html
> >
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:
> > http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/ 
> flyrotary/List.html
>