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# 排氣管開發製作規格與資訊

Tuned Exhausts for 2-strokes

adapted from "The two-stroke tuners handbook"

Note: Dimensions are in inches! All diameters are inside diameters. LT, L3 and L1 are measured from the cylinder wall, not from the exhaust flange!

.
 LT= (Eo * Vs)/N Where LT = tuned length in inches LT =諧振管的長度(以英吋計) Eo = Exhaust open period in degrees Eo =排氣打開時的溫度 Vs = sonic wave speed (use 1700 ft/sec) Vs =音波的速度(1700英尺/每秒) N = Crankshaft speed, in RPM N =機軸速度, 每秒轉速 D1 = stock lead-in pipe dia. D1 =儲存導入氣管通道 D2 = SQR( 6.25 * D1 * D1 ) D3 = D1 * 0.62 L3 = D1 * 10 L7 = D3 * 12 L2 = (D2/2)*cot(A2) L1 = LT - (L2/2) L4 = ( (D2 - D1)/2 ) * cot(A1) L5 = L1 - ( L3 + L4 ) L6 = ( ( D2 - D3 )/2 ) * cot(A2) A1 = half diffuser-cone angle of divergence (see below) A1 =外擴圓錐分歧角 A2 = half baffle-cones angle of convergence (see below) A2 =漸縮圓錐反射角 Notes: 注意: Centreline length of curved pipe: 曲線氣管的中線長度: L=R*0.01745*angle of bend L=R*0.01745*彎曲角度 The 2 stroke book says because of testing, an 8 degree angle of divergence for the diffuser cone connected to the lead in pipe is the minimum angle to start with and 20 degrees for the compression cone at the other end of the pipe is a good starting point. 二行程手冊測試,一個八度的漸縮圓錐反射角,連接導入氣管通道,是一個極小的開始角度,以及20度的壓縮圓錐在氣管的另一結束端,是一個好的開始. Solo 210 N=6300 Eo=180 LT=48.57 D1= 1.44 D2= 3.6 D3=0.89 L7=10.7 L3=14.4 L2=10.2 L1=43.5 L4=15.44 L5=13.63 L6=7.68 A1=4 degrees A2=10 degrees
Useful cotangents (degrees) 附表(度)
cot 3.0 = 19.0811 cot 5.5 = 10.3854 cot 8.0 = 7.11537 cot 11.0 = 5.14455
cot 3.5 = 16.3499 cot 6.0 = 9.51436 cot 8.50 = 6.69116 cot 12.0 = 4.70463
cot 4.0 = 14.3007 cot 6.5 = 8.77689 cot 9.00 = 6.31375 cot 13.0 = 4.33148
cot 4.5 = 12.7062 cot 7.0 = 8.14435 cot 9.50 = 5.97576 cot 14.0 = 4.01078
cot 5.0 = 11.4301 cot 7.5 = 7.59575 cot 10.0 = 5.67128 cot 15.0 = 3.73205

[ 本帖最後由 dvd30370 於 2006年9月30日 04:11 AM 編輯 ]

### 評分

jeepxj + 5 值得尊敬
Chou68 + 5 給您按個讚!

 值得一試十年前為這管子計算到焦頭爛耳

 感謝分享資訊,雖然看不懂,還是用心K了N遍,3Q

 一樓大大 你真厲害 讚

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