Snowmobile Polaris IQ (2007-2008 year). Manual - part 13

2.4

General Information

PUBLICATION PART NUMBERS

2008 Publications 

2007 Publications

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IQ Shift

9921427

9921067

9921068

600 RMK 144

9921102

9921108

9921112

600 RMK Shift 155

9921545

600 Dragon IQ

9921065

9921069

9921075

600 Switchback

9921076

9921081

600 Dragon 
Switchback

600 IQ LX

9921072

9921070

600 IQ Touring

9921082

9921083

600 RMK 155

9921102

9921109

9921549

700 IQ

9921065

9921071

9921070

700 Dragon IQ

700 Switchback

9921078

9921081

700 Dragon 
Switchback

700 RMK 155

9921102

9921104

9921549

700 Dragon RMK 155 
/ 163

9921104 / 9921106

800 Dragon RMK 155 
/ 163

9921301 / 9921107

9921114

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600 HO IQ

9920459

9920460

9920461

600 HO Switchback

9920597

9920598

600 HO RMK

9920476

9920477 / 9920483

9920478

600 HO IQ CFI

9920464

9920487

9920466

600 HO Switchback 
CFI

9920495

9920496

600 HO IQ LX CFI

9920465

9920466

600 HO IQ Touring 
CFI

9920501

9920502

700 HO IQ Dragon

9920648

9920910

9921200

700 HO RMK Dragon

9920476

9920484

9920912

2.5

General Information

2

ENGINE DATA FORMULAS

Compression Ratio

R= (IHV + DISP)

IHV

I=             S       

(DISP x 25.4)  

DISP =  (PI x B  x S)

4 

IHV= INSTALLED HEAD VOLUME (cc)
DISP= CYLINDER DISPLACEMENT (cc)
R= COMPRESSION RATIO
S= FULL ENGINE STROKE (cm)
I= INCHES PER cc OF IHV
B= CYLINDER BORE (cm)
PI= 3.1416  

2

2.6

General Information

Compression Ratio Example

Bore = 6.5cm

Stroke = 6.0 cm

IHV = 17.1cc

Displacement = 3.1416 (PI) x 42.25 (Bore squared) x 6.0
(stroke) / 4 = 199.098cc

Displacement = 199.098cc

R= 17.1 + 199.098 / 17.1 = 12.643 Full Stroke Compression
Ratio

To calculate the Effective Compression Ratio, substitute the
exhaust port height for the stroke in the formulas above:

Exhaust = 2.95cm (exhaust port height is 29.5mm)

Effective Displacement = 3.1416 (PI) x 42.25 (bore squared) x
2.95 (exhaust port height cm) / 4 = 97.89cc

Effective Displacement = 97.89cc

Effective Compression Ratio = 17.1 (IHV cc) + 97.89 (Effective
Displacement cc) / 17.1 (IHV cc) = 6.725

Effective Compression Ratio = 6.725

In order to increase the Full Stroke Compression Ratio to 13.6,
how much material do you need to remove from the cylinder
head?

You know that: R = IHV + Displacement / IHV, and you want
to find out IHV.

Displacement = 199.098cc, and we want R to = 13.6, so then
IHV (desired) = Displacement (199.098cc) / R (13.6) - 1 = (12.6)

IHV (desired) = 15.801cc desired IHV to have 13.6:1 Full
Compression Ratio

Head cc Removal Example

The total number of cc’s to remove from the head = Old IHV
(17.1) - Desired IHV (15.801) = 1.299cc’s

Removed cc’s = 1.299cc’s

I = Stroke (6.0cm) / (Displacement (199.098) x 2.54

I= 0.01186 inches

To find out how much to machine off, multiply the number of
cc’s you need to remove by the number of inches to remove per
cc.

Thickness to remove = I (0.01186) x 1.299cc = 0.015”

Port Opening Duration

Port open = 81.5° This indicates the degrees after TDC that the
exhaust port opens, and also the degrees before TDC that the
port closes.

Duration closed = 2 x 81.5 (port open)

Duration closed = 163

°

Total Duration = 360

°

Duration Open = Total Duration (360) - Duration Closed (163)

360-163=197

Duration Open = 197

°

Percent Open = Duration Open (197) / Total Duration (360) x
100

197/360 = 0.54722 x 100 = 54.722

Percent Open = 54.722

2.7

General Information

2

TORQUE CONVERSION

US to Metric

ft.lb - Nm

FT

.

LB

N

M

FT

.

LB

N

M

1

1.4

46

62.4

2

2.7

47

63.7

3

4.1

48

65.1

4

5.4

49

66.4

5

6.8

50

67.8

6

8.1

51

69.2

7

9.5

52

70.5

8

10.8

53

71.9

9

12.2

54

73.2

10

13.6

55

74.6

11

14.9

56

75.9

12

16.3

57

77.3

13

17.6

58

78.6

14

19.0

59

80.0

15

20.3

60

81.4

16

21.7

61

82.7

17

23.1

62

84.1

18

24.4

63

85.4

19

25.8

64

86.8

20

27.1

65

88.1

21

28.5

66

89.5

22

29.8

67

90.9

23

31.2

68

92.2

24

32.5

69

93.6

25

33.9

70

94.9

26

35.3

71

96.3

27

36.6

72

97.6

28

38.0

73

99.0

29

39.3

74

100.3

30

40.7

75

101.7

31

42.0

76

103.1

32

43.4

77

104.4

33

44.7

78

105.8

34

46.1

79

107.1

35

47.5

80

108.5

36

48.8

81

109.8

37

50.2

82

111.2

38

51.5

83

112.5

39

52.9

84

113.9

40

54.2

85

115.3

41

55.6

86

116.6

42

57.0

87

118.0

43

58.3

88

119.3

44

59.7

89

120.7

45

61.0

90

122.0

91

123.4

96

130.2

92

124.8

97

131.5

93

126.1

98

132.9

94

127.5

99

134.2

95

128.8

100

135.6

ft.lb - Nm

FT

.

LB

N

M

FT

.

LB

N

M