Paul Smart Replica - the investment you can enjoy while it appreciates

The camshafts are supported on oil pressurized plain bearings, which reduce the overall dimensions, the weight, and the number of moving parts, while also improving heat dispersal. The new configuration also puts the camshafts in a more direct relationship with the valves, reducing friction and stress on valve components and thus increasing reliability. In fact, although the cylinder head is more compact, it allows more space for the intake and exhaust valves, these being 45 mm and 40 mm in diameter respectively. Further innovations include valve seats made of beryllium bronze, a technologically advanced material that affords better heat dispersal and wear-resistance and thus maintains valve clearances more accurately over a longer period of time.

The 1000 DS engine uses an over-square 94mm bore and 71.5mm piston stroke. The pistons are now fitted with nitrided steel rings, which afford improved sealing and significantly reduce oil consumption. The 94 mm pistons are linked to the crankshaft with new connecting rods, made from a new material composition (30NiCrMo4) that has exceptional flow characteristics during forging. In cross section, the new rods are thinner side-to-side, but wider fore to aft, increasing strength and lowering weight for increased reliability and performance.

The new crankshaft is of a more compact design and the oil passages have been strategically repositioned in areas less critical for its structural strength. The result is a crankshaft that is more rigid and with less flex, making for less vibration and improved reliability.

Finally, both the clutch housing and the clutch plates are now made from a special aluminium alloy. Thanks to this new material, the clutch has a significantly longer service life due to the more balanced wear factor of the alloy. The clutch also now runs quieter due to improved tolerances and the lower resonance value of aluminium compared to steel.