Durasi Knalpot 2tak

RUMUS DURASI EXHAUS

T² + R² - L². 2 X R X T

PANJANG STANG PISTON

DURASI EXHAUS = ( 180° – CO) X 2

T = R + L – E

R = STROKE DIBAGI 2

L = PANJANG STANG PISTON

E = TINGGI LOBANG EXHAUS DARI T.M.A

EXE : 1 YAMAHA F.1.ZR

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

EXE : 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

EXE : 1

EXHAUST : 26mm

DURASI : 196°

RPM : 11.000

L = 196 X 42545 = 758mm

11.000

EXE : 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 haeder : 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 <>

*STINGER PANJANG PIPA Ø DALAM PIPA

125cc – 145cc ------ 150mm – 265mm 19mm – 23mm

145cc – 175cc ------ 150mm – 320mm 22mm – 27mm