Stihl BR 550 Technical Guide - Page 5
Technical Information, Engine design, Engine control
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Technical Information 08.2005 Page 5 1.5.1 Engine design 1.5.2 Engine control 7 1 2 6 5 4 254TI011 KN 3 Single-cylinder engine with overhead valves. Cylinder head, cylinder and upper half of crankcase have been combined into a single unit. The crankcase is horizontally split along the crankshaft. . Overhead valves (OHV), one exhaust valve (1) and one inlet valve (2) . Valve control via crankshaft gear (3), cam disk (4), lever (5), pushrod (6) and rocker arm (7) . Crossflow scavenging (= inlet and exhaust on opposite sides) TI_08_2005_11_01_02.fm
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Technical Information
08.2005
Page 5
TI_08_2005_11_01_02.fm
1.5.1
Engine design
Single-cylinder engine with overhead valves.
Cylinder head, cylinder and upper half of crankcase
have been combined into a single unit.
The crankcase is horizontally split along the
crankshaft.
1.5.2
Engine control
.
Overhead valves (OHV), one exhaust valve (
1
)
and one inlet valve (
2
)
.
Valve control via crankshaft gear (
3
),
cam disk (
4
), lever (
5
), pushrod (
6
) and
rocker arm (
7
)
.
Crossflow scavenging
(= inlet and exhaust on opposite sides)
254TI011 KN
1
2
3
4
5
6
7