Is it possible to convert a 'sebring' or 'diana' engine to a faster version such as a 'mach 1'?
If so, is it just a matter of changing out some internals, or are the cases actually different as well?
'sebring' >>to>> 'mach 1' conversion?
The differences between the Mach 1/Mk3 and lower performance models
are basically compression, cam timing, valve size and carburetion. There are hardware differences with some components (cylinder, clutch, crankshaft, rocker arms, points cam, magneto/alternator) that Ducati specified on the higher performance models, but the more pedestrian components can be used or modified since the basic architecture is the same. If you were to install a piston of comparable compression, larger valves, a Mach 1 or Mk3 cam and 29mm carb, and of course modify the head to accept these, you could expect performance on par with the genuine article. The cases, transmission, cam drive and lubrication system are basically the same among all 250/350 models. Of course, the Sebring has a longer stroke and larger bore. The Diana is already in a fairly high state of tune (except for early 4 speeds) so you wouldn't gain a whole lot more by taking it to Mach 1/Mk 3 specification.
are basically compression, cam timing, valve size and carburetion. There are hardware differences with some components (cylinder, clutch, crankshaft, rocker arms, points cam, magneto/alternator) that Ducati specified on the higher performance models, but the more pedestrian components can be used or modified since the basic architecture is the same. If you were to install a piston of comparable compression, larger valves, a Mach 1 or Mk3 cam and 29mm carb, and of course modify the head to accept these, you could expect performance on par with the genuine article. The cases, transmission, cam drive and lubrication system are basically the same among all 250/350 models. Of course, the Sebring has a longer stroke and larger bore. The Diana is already in a fairly high state of tune (except for early 4 speeds) so you wouldn't gain a whole lot more by taking it to Mach 1/Mk 3 specification.