So... back to the original question (I was glad to see it asked), I have a particular need for a narrow rear cassette and am about to cast up a housing (much like masterfabs pics of his test mule) and use an oil immersed chain.
Now I know a lot of guys are using exposed short chains and are experiencing heat issues, my thoughts are use a short chain but constant lube should give this a longer life.
Mine is destined for a short course off-road racing so it wont be run hard then rested like a recreational machine... it will simply be thrashed and thrashed.
I did look very closely at Mastfabs unit (silent chain) but then looked away quickly when he just quoted a price....
Any experience you guys wanna share? (take pity on me...just a poor lil ole boy from down in Aus...need help.... :-[)