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As Dave related, this is a bit of a problem with the Pitts S-2B, aat
least. I was given a piece of literature from the Aviat folks offering a kit (for several hundred dollars) that was basically some plumbing pieces that routed the manifold pressure line upwards behind the cylinder. I just found a way to route it upwards without the kit, I guess it allows the oil/fuel to drain back toward the head. Anyway, I never had a problem again after the reroute. As I recall there is also a vent orifice in the back of the gauge that I opened one turn, then returned it to the original position on the theory debris might have obstructed it. Good Luck. Jerry B wrote: G'day Dave, sounds like it's getting a drop of fuel or oil into the line. Your fix is easy on the ground but won't help much when you need it. Far be it for me to offer ideas on unauthorised mods, but a valve and a T piece in the line to allow fresh (filtered cabin?) air to enter the line while the engine is running and pulling vacuum (or boost if turbo?) should let you flush the line at your leisure. Should only take a second or two. Or a filter may be added to the beginning of the line. Something like a cheap plastic inline fuel filter may work nicely for the filter to a cabin air source as it will not be trying to cope with much pressure difference wgere one at the engine end may have to handle that and high temp and vibration. Other option that may help is a larger diameter tube that would require a lot more fuel or oil to block. Hope this helps, Peter "Dave Russell" wrote in message om... The manifold pressure gauge in my Super D is a pain. More acurately, it's the line that connects it to the engine. Ten minutes of aerobatics, and I can't get any kind of reliable reading; it just sticks wherever. It's easy to fix. A shot of air into the line (back toward the engine, of course) and it's good to go, but this is becoming a real bother. Can anyone tell me if there's a true fix for this, or am I just doomed to blowing the line clean after every flight that I take her inverted (i.e., as often as possible. :-) Thanks, -Dave Russell 8KCAB |
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