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A slipper piston is a piston for a petrol engine that has been reduced in size and weight as much as possible. In the extreme case, they are reduced to the piston crown, support for the piston rings, and just enough of the piston skirt remaining to leave two lands so as to stop the piston rocking in the bore.
The piston is connected to the Scotch yoke through a slipper bearing (a type of hydrodynamic tilting-pad fluid bearing). Mechanical fuel injection. Ports rather than valves. Easy maintenance (top overhauling) with simple tools. The Scotch yoke does not create lateral forces on the piston, reducing friction and piston wear.
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To compensate for the reduced capacity, the engine was tuned to produce more power [5] with a different camshaft, [1] slipper piston, 30 mm carburettor and a different exhaust using a Lafranconi silencer. [5] The factory ceased production of ohc singles in 1974.
Sealing was done with piston rings only and without the use of the bronze obturator rings used on Gnome and Clerget engines. [3] A complicated slipper bearing system was used in the Rhône series engines. The master rod was of a split type, which employed three concentric grooves, designed to accept slipper bearings from the other cylinders.
The engine is the "Desmodue", a 90° L-twin, 696 cc (42.5 cu in) 58.8 kW (78.9 hp) air-cooled engine with desmodromic valve actuation. [5] A slipper clutch prevents locking of the rear wheel through clumsy down-shifting.
The Michel engine was a two-stroke diesel engine, of piston-ported opposed-piston design. Its unusual feature was that rather than two pistons sharing a cylinder, the cylinders here were Y-shaped and contained three pistons. The two upper pistons controlled the inlet ports, with the one lower piston controlling the exhaust ports. [3]
The Aprilia RSV Mille is a sport motorcycle manufactured by Aprilia from 1998 to 2003. It was offered in three versions, RSV Mille, RSV Mille R, and RSV Mille SP. The first RSV Mille (ME) was made from 1998 to 2000, the updated RSV Mille (RP) from 2001 to 2002 and the last update was made in 2003.