06-4
MMC2005-001_06A.FM
SECTION 06 - DRIVE SYSTEM
SPEED DIAGRAM ENGINE SPEED VS. VEHICLE
SPEED
EFFECTS OF THE DRIVE PULLEY
LEVER ARM, ROLLER AND
ROLLER PIN WEIGHT
As you have seen in the formula defining centrifu-
gal force, the force increases directly with the
weight of the components involved. If you want
to increase the centrifugal force, therefore, the
shift force, it is a simple matter to increase the
weight of the pressure levers. If the overall RPM
is too high, a heavier lever arm or roller pin could
be installed. The opposite would apply if the RPM
is too low.
The major factor controlling centrifugal force is en-
gine RPM. Because the force increases with the
square of this speed, you can quickly have too
much force if heavy weights are used on a clutch
fitted to a high RPM engine. Because of this rela-
tionship, you will find heavy weights used on low
RPM, high torque engine types and much lighter
weights used on the high RPM engines.
The effect of the weights will always be greater at
high RPM, and at higher ratios. This is true be-
cause of the relation of the force to the square of
the engine speed. Also the radius from the axis of
rotation to the center of mass of the counter-
weights increases as the roller is allowed to move
down the ramps. As this radius increases, the cen-
trifugal force increases directly. Addition of weight
will affect engagement speed very little compared
to the effect the weight will have at mid-range to
top speed.
Minor changes in weight are accomplished by us-
ing various weight roller pins. The effects of add-
ing weight are illustrated in the following illustra-
tion. The three curves show the engine RPM
increasing from engagement speed (4000 RPM)
to about 6500 RPM which is achieved at about 30
MPH. From this point on, if calibration is accurate,
there is no change in engine RPM as the vehicle
speed increases. From the machine standing at
rest to about 30 MPH, belt slippage and other fac-
tors are involved that allow the engine to get on
the power.
100
90
80
70
60
50
40
30
20
10
1
2
3
4
5
6
7
8
9
10
HP
1500 RPM
400 RPM
RPM
x 1,000
Raced tuned
Mildly tuned
A01D0VA
10
20
30
40
50
60
70
80
90
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
A01D0WA
MPH
RPM
Low Ratio
Engagement
Speed
Shift - Speed
High Ratio
Содержание ski-doo MACH Z 1000 SDI
Страница 1: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...
Страница 118: ...04 36 MMC2005 001_04A FM SECTION 04 SUSPENSION SC 3 SC 4 RAS SC IV REAR SUSPENSION 0...
Страница 124: ...04 42 MMC2005 001_04A FM SECTION 04 SUSPENSION SC 3 SC 4 RAS...
Страница 196: ...05 72 MMC2005 001_05A FM SECTION 05 ENGINE PREPARATION FUEL TANK AND FUEL PUMP All Models except SDI 2 4 3 1 A33C2VS...
Страница 289: ...SECTION 06 DRIVE SYSTEM MMC2005 001_06A FM 06 27 422 A01D3JA 417 222 562 427 A01D3KA 417 222 677...
Страница 473: ...SECTION 12 SERVICE TOOLS MMC2005 001_12A FM 12 29 N Scratch remover P N 861 774 800 APPLICATION All models...
Страница 476: ...MMC2005 001_13A FM 13 1 SECTION 13 ACCESSORIES TABLE OF CONTENTS 0 ACCESSORIES 13 02...
Страница 493: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...