EXHAUST DURATION
RPM DURASI
10.000 – 11.000 194 ° - 196
11.000 – 12.000 196 ° - 198 °
12.000 – 13.000 198 ° - 200 °
13.000 – 14.000 200 ° - 202 °
14.000 -15.000 202 -204
RUMUS DURASI EXHAUST
T² + R² - L².
2 X R X T
PANJANG STANG PISTON
DURASI EXHAUST = ( 180° – CO) X 2
T = R + L – E
R = STROKE DIBAGI 2
L = PANJANG STANG PISTON
E = TINGGI LOBANG EXHAUS DARI T.M.A
Contoh : YAMAHA F1Z-R
STROKE : 52mm TINGGI EXHAUS : 26mm PANJANG CONROD : 96mm
R = 52 : 2 = 26mm E = 26mm L = 96mm T = 26 + 96 – 26 = 96mm
6² + 26² - 96².
2 X 26 X 96
D = ( 180° – COS ) X 2
D = ( 180° – COS O,135416666 ) X 2
D = ( 180° – 82,217 ) X 2
D = 97,782 X 2 = 195,565 → DURASI EXHAUS = 196° → 11.000 RPM
Contoh 2 :
STROKE : 52mm TINGGI EXHAUS : 25mm PANJANG CONROD : 96mm
R = 52 :2 = 26mm E = 25mm L = 96mm T = 26 + 96 – 25 = 97mm
97² + 26² - 96².
2 X 26 X 97
D = ( 180° – COS ) X 2
D = ( 180° – COS O,172283901 ) X 2
D = ( 180° – 80,079 ) X 2
D = 99,921 X 2 = 199,842 → DURASI EXHAUS = 200° → 13.000 RPM
* EXHAUST PIPE *
L = ED X42545
RPM
L = PANJANG IDEAL KNALPOT . ( dari PISTON sampai pertengahan CONE BAFLE ).
ED = Exhaust Durasi
RPM = Putaran mesin pada Exhaust Durasi
Contoh : EXHAUST : 26mm DURASI : 196° RPM : 11.000
L = 196 X 42545 = 758mm
11.000
Contoh 2 : EXHAUST : 25 mm DURASI : 200° RPM : 13000
L= 200 X 42545 = 654.5 mm
13.000
* HEADER *
Ø Port dalam exhaust : 100cc → 140cc 34mm → 40mm
140cc → 175cc 40mm → 46mm
Panjang header : 7.8 → 8.8 x Ø Port exhaust
Sudut header : 1° → 2° max ( road race ) . 2° → 3° max ( motocross )
* FLANK *
Jarak antara piston dan header : 60mm – 80mm
* DIFFUSER *
Sudut Diffuser : Stage 1 = 6.5 ° → 7.5 °
Stage 2 = 4.5 ° ; 7.5 °
Stage 3 = 4.5° ; 7.5° ; 9° → 10°
* BELLY *
Ø Belly 2 → 3 X Ø Port exhaust Panjang belly = L – ( Header + Diffuser + ½ Bafle )
* BAFLE *
Sudut Bafle 9° - 12°
* STINGER *
PANJANG PIPA Ø DALAM PIPA
125cc – 145cc ------ 150mm – 265mm 19mm – 23mm
145cc – 175cc ------ 150mm – 320mm 22mm – 27mm
