Re: Engine

In a way, yes... The muffler itself may not be developing enough pressure to hold the fuel in place as it's thrown back by centripetal forces.

Try shortening the fuel lines as much as possible.

Otherwise the engine doesn't "care" about orientation or normal "G" forces as long as the fuel is flowing into the carb.


If you have an in-line filter you may also want to try to eliminate it in favor of an in-tank filter, such as the dubro brass filter clunk.

Also make sure that the nipples are tight ( but don't break the threads! ), and you may want to be sure that you are using medium as opposed to small fuel tubing throughout.


Finally also try a long plug, just in case what is happening is that the fuel is drowning the element at high "G".
This will also permit you to richen the engine slightly more which may help hold speed if it is a starvation issue.

What prop are you using?

If the engine is new I find that the APC props additional slight weight help to keep the engine running, where it may cut out with other lighter props. After the engine has several gallons of fuel through it this is not required though.


BTW:

The last time something like this happened to me, it turned out that I had a hairline crack on one of the fuel fittings at the threads.

High "G" manouvers were pulling on the tubing just enough to open the crack and let air in.

I went to tighten the nipples and discovered that it broke off without any effort or force, leaving the broken tip in the socket.

After I removed this and installed a new one, the problem went away.