Anderson Ed wrote:

Ok, Paul,
        I think I will try the snorkel approach though. Not much I can do about
straigtening out the duct without some major component shifts.  Side
opening is dumping oil cooler air out a set of louver, bottom opening
does dump to cowl right above another set of louvers in bottom of cowl
under oil cooler exit duct. Good suggestion about bulding duct to
enclose motor mount braces - I may try that if snorkel does not help.  I
don't feel I need much more improvement on the oil temp.  If I could
lower by 5 -10 degrees at WOT then that would do the job.

The more I think about it, the more I believe that simply improving the
oil inlet duct flow would probably do the job. If the 20 sqr inch
opening and a 5" duct is not doing the job, I am beginning to wonder if
the Earl 25 Row oil cooler is undersized for the job.

Ed

Don't recall dimensions of PSRU, but will measure this weekend.

Ed

The cooler looks plenty big enough. Seal that outlet area to the louvers
on the bottom of the cowl. Actually I am not a believer in louvers
as the first one blocks the rest. It is better to have one big flap
on there and smooth the 90 degree change in direction with a
nice large radius. 

Here is a picture I just took of the fastest RV6 
in the country. Tracy Saylor's. 
The picture does not show it but the streamlined
exit duct is cut off on a forward slant about a 45 degree angle.
In other words the lower lip is ahead of the firewall.
Notice the large radius applied to the lower firewall where it
turns 90 degrees aft.  fastrv6.jpg

BTW note that one cylinder is running richer than the others.
Typical of even fuel injection systems. That is why the ideal
FI would have individual control over each rotor based on
EGT.

Paul Lamar
 
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