Suzuki GSX R 1000 Page 49
ENGINE
DESIGN
Engine Design
4-8
3) Ventilation Holes
(1) Ventilation Holes
The new GSX-R1000 has ventilation holes between adjacent cylinders.
There is one 35mm-diameter ventilating hole on each cylinder wall, for a total of 4 ventilating
holes.
The ventilating holes reduce pumping pressure inside the cylinder.
The vertical motion of a piston inside a cylinder is accompanied by pumping losses, because the
air underneath the piston gets pumped by the piston. The ventilation holes reduce such pumping
losses.
For example, when the piston inside the 1st cylinder moves from top dead center to bottom dead
center, the air inside the 1st cylinder underneath the piston generates losses against the piston's
downward movement. By having ventilating holes, the air that creates such pumping losses can
move to the neighboring cylinder and magneto chamber, and thus reduce the pumping pressure
inside the 1st cylinder.
This way, by transferring the pumping-pressure-causing air inside each cylinder to a adjacent
cylinder, pumping pressure, windage and associated mechanical power losses can be reduced,
thereby contributing to improved power output.
Ventilation Hole Specification Chart
2003 GSX-R1000
2002 GSX-R1000
Ventilation Holes
YES
NO
The Number of Ventilation Holes
4
-
Diameter
35mm
-
Ventilation Holes
