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DUCum_MS2R#DARK#05_##gb.book Page 66 Friday, November 5, 2004 3:00 PM
E
Engine
Twin cylinder, four-stroke, 90° “L" type, longitudinal.
Bore, mm:
88
Stroke, mm:
66
Total displacement cu. cm:
803
Compression ratio ±0.5:1: 10,4
Max. power at crankshaft (95/1/EC):
55 kW - 75 HP at 8,250 rpm - for derated version 24kW 33HP at 8,000 rpm.
Max torque at crankshaft (95/1/EC):
70 Nm (7.0 kgm) at 6,500 rpm; for the derated version
44Nm (4.5 kgm) at 4,500 rpm.
Timing system
Desmodromic (type) with two valves per cylinder,
operated by four rockers (2 opening rockers and 2 closing
rockers) and one overhead camshaft. It is operated by the
crankshaft through spur gears, belt rollers and toothed
belts.
Desmodromic timing system (fig. 61)
1) Opening (or upper) rocker
2) Opening rocker shim
3) Split rings
4) Closing (or lower) rocker shim
5) Return spring for lower rocker
6) Closing (or lower) rocker
7) Camshaft
8) Valve
1
5
2
7
8
3
4
6
66
fig. 61