ENGINE
17
FULL STROKE COMPRESSION RATIO
16 15
DANGER ZONE 14 13
SAFE ZONE
12 11
UNNECESSARY OCTANE 10 9 8 REGULAR
PREMIUM
RACE FUEL
7 84
86
88
90
92
100
105
110
115
120
PUMP OCTANE NUMBER
R = (IHV+DISP) IHV I = S (DISP*25.4) DISP = (PI*B*B*S) 4
IHV = DISP= R = S = I = B = PI =
INSTALLED HEAD VOLUME [CC] CYLINDER DISPLACEMENT [CC] COMPRESSION RATIO FULL ENGINE STROKE [CM] INCHES PER CC OF IHV CYLINDER BORE [CM] 3.1416
2.5