Today I did the first test run with the complete engine, as
it will go in the airplane, except for the cooling. All
systems worked great until about 2minutes of 5000rpm, and
oil started flying everywhere. The engine kept running as
if nothing happened. After engine shut down, I found that
the oil was coming mainly from the main seal at the
flywheel. All warm-up run was fine without any oil coming
out anywhere. After recalling everything I observed,
including a couple of oil puffs coming from the exhaust
prior to the oil spilling out, my conclusion was increasing
pressure in the oil pan as the cause. Sure enough, the oil
pan breather hose was clogged by a mud dubber. No telling
when that happened.

The engine is running extremely smooth. At 5000rpm and
4.6gal/h producing about 55hp. I had no time to read all
parameters before shut down. I am using a 72" 3blade IVO
prop. This makes it convenient changing the load for
different test runs.
The new muffler seems to be a little quieter then the one
on the previous engine, which some of you may remember from
Shady Bend.
More data and pictures next week.

Richard Sohn
N2071U

For those not familiar with mud dubber it is a species of
wasp.

Here are some older pictures of Richard's engine for the
new subscribers.

Paul