hello everbody !! i'm thinking about a ucando 3d 60 with a 91 saito..my friend say's that guy's in his club have had problems with 4 strokes running good mounted inverted...can anybody touch on this ?? thanks[sm=spinnyeyes.gif]

Hi,
fast reply to this. I have several planes with inverted 4 stroke engines and I have no problem with any of them.
Larry

The U-Can-Do is NOT a Nitroplanes/Nitromodels airplane.

You may want to try the other forums instead.

I have flown a UCD60, with inverted engine for 3-4 years. Have had an OS 91 on it, sAITO 100, AND lasty a Saito 125. They will run with NO problems inverted. The only problem that you will have is fuel siphoning from fuel tak into the engine. i installed feed thru fuel line fittings thru the fuse, and ran a fuel line loop outside the fuse. used a fuel line clip that i closed right after landing. then when starting, release the clip just before using starter. works great. Also refuel the tank thru this loop.

Bruce

aa2dd

I just had a heck of a time trying to get my Magnum .91 FS to idle inverted in Nitromodel's 90 sized Extra. The engine ran great right side up, but wouldn't do it inverted. I was getting so mad, I almost gave up, but a guy at the LHS told me to check the valve clearances (btw this is my first FS). I did that today, and the valves were about 3 times as big as they should be on the larger side. Keep in mind this engine was brand new, and just got 1 gallon run through on a test stand, and it ran great. Anyways, after I fixed the vlaves, I set the low speed and high speed needles, and the engine no only idles like a dream very consistently, with ne chance of it dying, but it has more power now too! So my answer to running a FS inverted is that if you have it tuned and set up right, and you take care of it, you will have no problems whatsoever. Just break the thing in rightside up on a test stand so you can run it rich enough.

Scott