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>I am still using Marvel Mystery Oil (4oz's @ 10 gallons 100LL)
>and recommend this to the Lancair family of aircraft.
This is pretty interesting... I assume that it's for top-end lubrication. As you are probably aware, I'm well along the way with the planned installation of a rotary (Wankel) engine in my LNC2. The operation of the rotary demands that oil be introduced into the combustion chamber as lubrication for the apex seals. The Mazda rotary includes an oil injection system to accomplish this task. However, the problem with this scheme is that crankcase oil isn't exactly the cleanest burning stuff in the world, and so an alternative method of delivering this required lubricant to the rotor seals was mandated by the folks who preferred cleaner internals than what they got with motor oil. Several current fliers and virtually all of the racing crowd who run these engines started out using Marvel Mystery Oil, as it seemed to be fairly clean burning and provided the required lubrication. However, further testing showed that there was still some ash to be dealt with from burning MMO, and so an alternative was searched out and decided upon. The solution that virtually all of these people have adopted is the mixing of high-quality 2-stroke oil with the fuel. This is a true ashless dispersant oil, and one flier who decided to "take a look inside" his engine after 850 hours of operating with the 2-stroke mix found the internals to be spotless, wear negligible, and the engine capable of being simply reassembled with the use of an ordinary gasket set and without further cleanup. The mixture ratio being used in this application is 1:128, or 1 oz oil per gallon of fuel. It is entirely likely that reducing that amount by 1/2 would still provide the top-end lubrication you are currently enjoying with the MMO, but without the ancillary production of carbon as a result of the combustion process. Food for thought, eh?
<Marv>
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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