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[arpati]

quote:
Tuossa rupesin tavaamaan tuota "Four Stroke Performance Tuning" kirjaa johon aiemmin viittasin noista eri pituisista pakosarjan putkista ja kyllä siellä jotain juttua noista oli... Mitta eroiksi jotain 2" - 4" verrattuna siihen "optimaaliseen" pituuteen. Eli vissiin yksi tuohon optimi pituuteen ja siitä sitten lyhempää ja pidempää...

Koitan laittaa lainauksen (lontoota) tänne jahka saan kirjan ja nettikoneen samaan paikkaan <img src=icon_smile_blackeye.gif border=0 align=middle> Nyt kirjoittelen kirjaston koneelta ja uudessa lukaalissa ei ole vielä nettiä <img src=icon_smile_dead.gif border=0 align=middle>

Notta Hippo voi hyvin sanoa että noi on tolleen suunniteltu <img src=icon_smile_big.gif border=0 align=middle>

No niin tässä suoraa lainausta...


"Under such conditions (BDA escort & novice & snow covered tarmac) we want the engine to respond very gently to delicate throttle movements - we do not want sudden surges of power. The approach may be to use unequal-lenght stepped headers.

Why unequal lenght primary pipes? Well, this tunes the torque peak in each cylinder to different rpm, thus flattening and smoothing the torque curve. It tunes out that sudden rush of power, so instead of the engine coming on song at, say, 6250rpm, the torque peak will be lowered slightly but may go all the way from, say, 5500 to 6500rpm. Hence one cylinder may peak at 6000rpm, another at 5750rpm, another at 5500rpm and still another at 6250rpm.

To achieve this the primary lenght would be adjusted to minus 2in plus 4in from the ideal lenght. Therefore if the "correct" lenght was found to be 29in, the four pipes would vary in lenght from 27in to 33in. In reality I prefer unequal-lenght headers in most applications. For a long time it was thought that equal lenght tuned headers were the best way to go, but when it was discovered in installations where equal lenght pipes just would not fit that the package often became more driveable, some tuners slowly came around to acknowledge the adwantages of unequal-lenght pipes."


Suora lainaus kirjasta Four stroke performance tuning - Second edition 1998 - reprinted 2003 (eka versio jo vuonna 1981 <img src=icon_smile_big.gif border=0 align=middle> ) / A. Graham Bell / ISBN 1 85960 435 8 / Sivu 163 kappaleen 3 loppupuolelta eteenpäin.




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Edited by - arpati on 01/04/2006 16:12:21