Ducati 998 - Engine Specifications; Desmodromic Timing System (748;748 S)

748
748S
59
E
Engine
Twin cylinder, four-stroke, 90° “L” type, longitudinal.
Bore mm:
88
Stroke mm:
61.5
Total displacement cu.cm.:
748
Compression ratio:
1:11.5±0.5
Max. power at crankshaft (95/1/CE):
72 kW - 97HP at 11000 rpm
Max torque at crankshaft (95/1/CE):
74 Nm at 9000 rpm
Max. rotation speed:
11500 rpm
Important
Do not exceed specified rotation speed limits
under any running condition.
Timing system
Desmodromic (type) with four valves per cylinder,
operated by eight rocker arms (4 opening rockers and 4
closing rockers) and two overhead camshafts. It is
operated by the crankshaft through spur gears, belt
rollers and toothed belts.
7
6
6
8
2
1
5
1
3
4
Desmodromic timing system (fig. 44)
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.
fig. 44
748/748S
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