William Robison
Posts: 20269
Joined: 11/10/2002 From: Mary Esther, Florida, FL, USA Status: offline
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Up: You will find the FA-82, even after being fully run in, will seem to shake more than the others. It's not a mechanical vibration when adjusted properly, but rather a reaction to the high torque peaks. You are number 51. Brian: Two reasons for the move of the breather. First, it does force more lube to the camshaft and tappets, but I think the main reason was going to the plastic back plate. If the breather nipple were in the plastic it would be relatively fragile. One of my experiments has the breather moved to the top of the cam box, from there to the exhaust rocker box and then across to the intake rocker box. Finally, the actual atmospheric vent is from the intake rocker box. Why? This forces the oil past the cam and tappets for better lubricatjon there, and ensures positive lubrication to the rockers and valve stems. This is mainly for upright engines, when they are inverted the rockers seem to get plenty of oil. Upright they are almost always dry. Bill.
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Real Airplanes have Two Engines AMA 25139 - More than 40 years.
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