wrote in message . ..
On 2 Jun 2004 17:08:14 -0700, (Paul Lee) wrote:

the engine was near top temperature limit at climb; and oil
temperature was high - at only 70F outside, maybe I need bigger oil cooler for
the Franklin? Any Franklin experts out there? Recommended oil cooler size?

From all I've read Paul, air cooled engines in rear mount position are
tough to cool properly. Does your design have actual scoops for the
cooling air, or NACA type openings?


Yes it does have scoops - with downdraft. But CHT's were not too bad.
Near limit at climb and only about 320F in cruise. Its the oil
tempereature that is of concern. Just found out that my oil cooler,
Positech 4211, is too small for the 220HP Franklin - Positech
recommends 4219.