REFLECTOR: Engine compartment oil cooler

[Pat Shea]

Richard,

The factory sells an aluminum plenum for the standard
oil cooler that bolts to the firewall. It comes w/ a
flange for SCAT. I pressurized mine by pulling from
the the co-pilot's runner. It exhaust into the engine
compartment (low pressure side). I'm pulling my
induction air from the pilot's runner. There's no
extra  external scoops and only the standard rear cowl
openings. Oil temps are staying at or below 200* at
max power climb & 185* at 75% power cruse. CHTs are
under 400* during max power climb & around 365* at 75%
power cruise. Here are some links to pics:

http://www.tvbf.org/gallery/?display=subsystems%2Fair_cooling%2FDsc00133.jpg

http://www.velocityaircraft.com/photos/Engine/Lycoming%20IO540/pages/REAR-OIL-COOLER.html

Pat

 
--- Richard Riley <Richard at riley.net> wrote:
> I'm doing a little work on a friend's Velocity XLRG.
>  It's been running 
> very high oil temps.  The reason may be that the
> very large oil cooler in 
> the engine compartment isn't getting any pressurized
> air - it's just 
> sitting in front of the forward right cyl, standing
> in the still air of the 
> upper cowl.
> 
> I'm thinking it should get pressurized outside air
> to one side, then 
> exhaust from the other into the engine compartment.
> 
> I'm figuring on doing a plenum on the back of the
> cooler, and getting 
> pressurized air from the main plenum on top of the
> engine, or adding a 
> scoop to the bottom cowl and running a piece of SCAT
> to a plenum on the 
> front of the cooler.
> 
> Is there a standard way for this to be done on the
> XLRG, or do they 
> normally have an oil cooler without any airflow?
> 
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