Rotax 912 questions

Let me first start this by saying that I have the 912S so there may
and I'm sure there are differences from the 912 other than the
obvious. Now having said that the "coolant" is more for keeping the
cylinder heads an even temp. The 912 is air/ oil cooled and atleast
in my manual they reference oil operating temps rather than coolant
temps. I have talked to quite a few people who are flying or have
built the planes with the 912 and many have even left off the water
radiator and went with an oil cooler only installation. I know that
mine does have both and I have even installed an oil thermostat that
you can get from Lockwood Aviation. I does take mine a little while
to warm up but the thermostat has helped a lot and now instead of my
temps being around 142-155 when flying it is closer to the bottom of
the normal range (190-230). In the fall though I went as far as
covering the radiators or atleast most of them to help with the warm
up and to help raise the temps a little since they say to get it above
210 for a few minutes as a minimum during flight to boil out any water
in the oil from condensation. I have thought about eliminating the
water radiator or atleast looking for a smaller one but it is kind of
nice during the summer when everyone else is complaining about
overheating on climb out and I'm having no trouble at all!

Hope this helps you some.

Gary

On 4 Apr 2005 17:31:22 -0700, "RPar"
wrote:

I've talked to Lockwood about the chatter. They did not seem to think
it was out of the ordinary. I would feel better if I had some input
from people running them though.

I'll have to check the inertia spec. It was professionally made for the
912 so I assume that it is correct, but it definitely never hurts to
check.

I did read the installation manual and yes I do get the bulletins. My
912 had to have the oil pump drive pin and new stator assembly
installed ($$$). This was performed, along with a complete inspection,
prior to installation and first start-up.

Thanks for your input.

- RP


You are asking a news group instead of an authority such as Lockwood,
a
certified Rotax repair station? http://www.lockwood-aviation.c**om/

OK here goes:


A five (or ten!) year old 912 certainly should have been gone through
before installing it on your airframe. It will need new rubber seals
on


the water pump as a minimum. The gear box on the 912 80 HP (black
valve


covers) has been very good. Not true with the 912S 100 HP engine (with

the green valve cover). Rotax has added a slipper clutch and a higher
torque starter for the 912S. Your problem may be related to the prop.
Does it meet the inertia spec for the Rotax? Too high an inertia will
eat your gear box.

Have you read the installation manual at www.rotax-owner.com and
signed up for service bulletins?