RUMUS PERHITUNGAN KNALPOT

Tuned EXHAUS VALVE OPEN DEGREE BEFORE B.D.C

R P M

50° 55° 60° 65° 70° 75° 80° 85° 90°

8.000 21.5 21.9 22.5 23.0 23.6 24.1 24.6 25.2 25.8

8.500 20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0

9.000 18.7 19.2 19.6 20.1 20.6 21.1 21.5 22.0 22.5

9.500 17.6 18.0 18.4 18.9 19.4 19,8 20,2 20.7 21.2

10.000 16.5 16.9 17.4 17.8 18.3 18.6 19.1 19.6 20.0

10.500 15.6 16.0 16.4 16.8 17.2 17.6 18.0 18.4 18.8

11.000 14.8 15.1 15.5 15.9 16.3 16.7 17.0 17.4 17.8

11.500 14.0 14.3 14.7 15.1 15.5 15.8 16.2 16.6 17.0

12.000 13.3 13.6 14.0 14.3 14.7 15.0 15.4 15.8 16.1

P = 850 X ED - 3

RPM

ID = √CC ______ X 2.1

(P+3)X 25

IDS = √ ID² X 2 X 0.93

P = PANJANG HEADER ( INCH ) RPM = PUTARAN MESIM MAXIMUM

ED = EXHAUS DURASI = 180° + KLEP EXHAUS MEMBUKA SBTMB

ID = Ø DALAM PIPA P = PANJANG PIPA HEADER ( INCH )

Ø PIPA HEADER MINIMUM SAMA Ø KLEP EXHAUS

IDS = Ø DALAM PIPA SEKUNDER

EXE : EX CLOSE : 80° SB.TMB RPM : 11.000 VOL CYLND : 110cc P : 17.0” / 431.8mm

√

110 . ( 17.0 + 3 ) X 25

ID= 110 X 25

17,0+3 X 25

ID = 0.98 ins / 24.89 mm

IDS = ( 0.98X2 ) X 0.93

IDS = 1.28 ins / 32.7 mm