i'll start by saying that i'm gonna try this and wont feel bad at all if it fails spectacourly (sp?). what im gonna do is put 3 briggs 15hp big block engines (32cu.in) on my montgomery wards tractor. its a simplicity S frame shaft drive style. my plan is to put them on inline and stretch the frame, easy enough... but what i'd like to do is have them all run down to a jack shaft with seperate drive belts. the theory is that then i could engage them as power is needed by a hand lever that would engage seperate belt tensioners in stages per say. my real question i suppose is to run springs to tension the "clutches" or to run an adjustable threaded system? it would also be a dead man, that if an accident happend would go neutral.