REFLECTOR: Rear oil cooler

[Andrew Ellzey]

Scott,

Thanks for the information.

Andy

----- Original Message ----- 
From: "Scott Derrick" <scott at tnstaafl.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, August 06, 2006 7:06 PM
Subject: Re: REFLECTOR: Rear oil cooler


> Andy,
>
> I'll tell you how I plumbed my dual cooler installation for a TSIO520.
> I previously had an IO360 with one cooler in the nose, with a diverter
> flap in the cooling duct to direct air into the cabin for heating.  I
> thought the heater was marginal at best. It would put adequate heat into
> the pilots position if the temp was above about 20F.  The copilots
> position got cool to cold air because the 1.5 inch duct from the cooler
> duct to the other side of the fuselage up and over the nose gear leg
> would cool it off before it reached the cabin.  The back seat was just
> plain cold.  I'm talking winter flying up above 8500 ft in the west.  My
> only winter flying in a V near Florida was ferrying my V back to New
> Mexico in Feb.  I was on top at 12500 and froze my ass off.  Temps were
> 0F to -10F.  miserable with the flu.  I had adequate cooling with the
> one cooler in the summer. Only time I would have to watch the temps were
> mid summer when we would stop for fuel and immediately take off from
> Vegas or some other hot place and need to climb with an engine that was
> already hot. I would sometimes have to cruise climb at 130-140 kias to
> keep the oil temp below 230(my personal red line).
>
> So part of my new engine installation was to also solve the cabin
> heating problem.
>
> I have two coolers in series.  The first one is mounted mid cabin under
> the rear seat. It is a small "Perma Cool" type rated at 180 PSI  at
> 300F, high flow.  This has two fans attached. The air is sucked in from
> the cabin and can either be recirculated to heat up the cabin or dumped
> overboard for secondary cooling during the summer.  The second cooler is
> the standard nose mounted cooler.  This provides maximum heat for cabin
> heating by running the oil through the mid cabin heat exchanger first.
>
> I have done a couple of other changes to optimize oil cooling.  Turbo
> charging places an additional burden on oil cooling.
>
> 1.)  I removed the diverter flap from the nose cooler duct to insure
> maximum flow through this cooler. It makes a difference.
> 2.) I have split my lines, the oil flows from the engine up the pilot
> side duct, and back to the engine through the  co-pilots side duct.
> 3.) I am "not" stealing cylinder cooling air(over head NACA's) for any
> thing (secondary oil cooler, induction air, intercooler, etc..)  I know
> others disagree but I believe oil temperature has a direct connection,
> not one-to-one mind you, with cylinder head temperature. Keeping your
> cylinder temps in the low 300's will dramatically effect your oil temps.
>
> Scott
>
> Andrew Ellzey wrote:
>> Is the second oil cooler in the rear always needed on the IO-540
>> installations? If so what is the proper pluming to make two coolers
>> work? Do you plum them in series with the front cooler plumed first to
>> give you enough heat for winter or what? My IO-540 E1A5 from an Aero
>> Commander was only using one oil cooler.
>>
>> Andy
>> ------------------------------------------------------------------------
>>
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> -- 
>
> -
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> liberty than to those attending too small a degree of it.
>
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