New Engine on New homebuilt

On Fri, 12 Aug 2005 20:45:36 -0700, Jerry Springer
wrote:

wrote:
Jerry Springer wrote:

"Gig 601XL Builder" wr.giacona@coxDOTnet wrote


Tie the aircraft to a pole and...

Not a good idea for a new or rebuilt engine. It needs air flowing
to keep cylinders cool. Happened to a local guy who thought it was neat
to taxi all over the area in his new airplane, overheated cylinders and
it burned a lot of oil from the very beginnoing. He had to rebuild the
cylinders.



I can see that happening at idle speeds but if you run the
engine up to full throttle won't the prop wash provide enough
cooling, depending on the cowling of course.

Actually it will not, a prop turing at full speed with airplane not
moving is not very efficient at all. It also take forward speed to
create enough airflow for cooling. A lot of homebuilts have very tight
cowlings and need a fair amount of pressure to force the air down and
around the cylinders

It depends on how well the engine is cooled. Many "Spam Cans" won't
heat up enough to get the contaminants out of the oil, but new, or
rebuilt engines are a different animal.

OTOH isn't there a requirement for one hour on the engine before it
takes to the air, or is that before the FAA inspection and sign off?

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
Jerry