mit der richtigen Formel und ein wenig Wissen über den eigenen Motor ist das ganz einfach.
Die Formel lautet: Hubraum in Cui x UPM* x Wirkungsgrad ÷ 3456
Der Wirkungsgrad meint den volumetrischen Wirkungsgrad des Motors. Bei seriennahen Motoren ist von ca. 80% und bei leistungsgesteigerten Saugmotoren ist von bis zu 98% auszugehen.
Hier ein paar Beispiele:
- Ford Mustang mit 302Cui, C4 Automatikgetriebe und Edelbrock Performer Ansaugbrücke
302 x 5200 x 87% ÷ 3456 = 395CFM - Chevrolet Corvette 350Cui, Handgeschaltet, Weiand Ansaugbrücke, Edelbrock Performer Nockenwelle
350 x 5800 x 92% ÷ 3456 = 540CFM - Dodge Charger 440Cui, 727TF Automatikgetriebe, B&M Tork Master 2000, Edelbrock RPM Ansaugbrücke, CompCams Xtreme Energy Roller Nockenwelle, Flowtech 1,75" Fächerkrümmer
440 x 6600 x 96% ÷ 3456 = 807CFM
Wie man an den oberen Beispielen gut sehen kann, ist ein „großer“ Vergaser nicht immer die effizienteste Wahl, bietet allerdings Reserven bei hohen Drehzahlen.
Die folgende Tabelle ist für modifizierte Motoren mit 90% volumetrischen Wirkungsgrad
|
Drehzahl / Cui |
250CUI |
300CUI |
350CUI |
400CUI |
450CUI |
|
4500Upm |
293CFM |
352CFM |
410CFM |
469CFM |
527CFM |
|
5000Upm |
326CFM |
391CFM |
456CFM |
521CFM |
586CFM |
|
5500Upm |
358CFM |
430CFM |
501CFM |
573CFM |
645CFM |
|
6000Upm |
391CFM |
469CFM |
547CFM |
625CFM |
703CFM |
|
6500Upm |
423CFM |
508CFM |
592CFM |
677CFM |
762CFM |
*Bei Straßenfahrzeugen sollte der Schaltpunkt, nicht die Maximaldrehzahl des Motors gewählt werden.
Diese Angaben sind als Leitfaden zu verstehen, für eine genauere Beratung schreiben Sie uns eine Mail oder rufen einfach an.
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