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Date: Sat, 07 Mar 2009 20:33:38 -0500
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Subject: Re: [LML] oil cooling
From: "Tom Giddings" <tgiddings@avionix.com>
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Randy: One thing I noticed right away is your NACA duct intake is not far
enough forward on the cowl.It should have the inlet start just where the
cowl starts to round toward the spinner. This allows the  high pressure 
air to feed the NACA. Another potential problem trying to exhaust the hot
air from the cooler into a high pressure area in the cowl bottom. You
might try placing(temporarly) a quarter inch piece of foam or a piece of
dowl ect at the cowl splash bottom.This will trip the air in a high
presure area and cause  low presure at he departure point of the oil
cooler discharge.Remember air cooling requires you go from high pressure
to low pressure to get rid of the heat.My guess is that it is more likley
your trying to dump hot into a high pressure. The discharge air is not
leaving the engine compartment

Kind Regards
Tom Giddings
0235/290 133TB


 All,
> I am looking for suggestions on how to lower my oil temps. I am running an
> IO 320 on the original 235 frame. On warm days in a climb I have trouble
> keeping them below 220. I usually have to flatten out the climb to cool
> things down if they get up to 230 or so. Once in cruise it is not a
> problem and they will settle around 210. I would like to get them down to
> 190 if possible. The problem is on a 75 plus degree day when the airplane
> is already warm from flying and I need to go again. I am picking up
> outside air on a naca vent on the left side of the cowl. There is a 6"
> length scat tube (4"diameter) connecting the cowl inlet to a glass
> expansion section that is connected to the cooler.(see pics). It just
> dumps in the lower cowl area.
> I am running a Stewart Warner oil cooler that many have had success with.
>
> I have tried larger hoses to the cooler now using -8's and also removed
> the 90 deg fittings I used to have to improve flow.
> I suspect my ducting and or connection to the cooler could be improved. I
> am looking for suggestions that could be done without cutting the cowl.
>
> Thanks in advance!
>
> Randy L.Snarr
>
>
>
>
>
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