Finn Lassen wrote:

Ok, so I spent $25 on a 19-25psi cap. Still loosing about a quart coolant per
3/4 hour.

So we know the engine is pumping air into the coolant jacket, forcing the
coolant into the overflow bottle.

I have been running at higher RPMs than I used to before I had this problem
(5,900 compared to 5,100). A guy at work suggested that maybe the water pump is
pumping in air through the seal around the pulley shaft. Anybody on this list
ever experienced this happening?

No, I haven't yet had the re-drive off to check tension bolts nor pumped air
into the rotor housings via spark plug holes to see if I get air bubbles coming
up out of the coolant refill neck.

Weather and time permitting I'll make a one-hour flight tomorrow keeping RPM
below 5,000 to see if that makes a difference.

Finn

Be careful when you pump air into the rotor housing. That is a good way
to knock your block off (get seriously hurt) when the prop comes violently around.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org