This paper will compare the effects of reciprocating mass per cylinder and engine speed on connecting rod load reversal cycles for typical engines of varying displacement, cylinder count and induction type to explain why turbocharged engines have demonstrated vastly superior durability results in the LMP900 and GTP classes at LeMans in recent years. One of the attractive characteristics of the spectacle of the 24 Hours of LeMans is the technical variety of engine type and size solutions competing for the overall win. The question whether the turbocharging solution offers sufficient advantages in any racing application depends entirely on the technical restrictions governing that application. In the absence of technical restrictions on turbocharged engine output, obviously turbocharging offers significant advantages in outright power capability, as well as power/weight and power/size ratios. But what about the situation where the technical restrictions placed on turbocharged engines are carefully calculated to marginalize any peak power advantage and make all powerplant peak outputs essentially equal? Such is the case concerning the technical regulations currently in force (2002) at the 24 Hours of LeMans, sanctioned by the Automobile Club de l'Ouest (the ACO). In this situation, what advantages are left for turbocharging to offer? There are several well understood ones. Smaller displacement gives reduced internal friction losses which contribute to minimizing fuel consumption. A smaller, lighter engine package allows the possibility for 1) vehicle handling improvements due to lower center of gravity and lower gross vehicle weight; and 2) body aerodynamic improvements due to smaller engine covers that can reduce drag and improve rear wing performance by reducing turbulence in front of the rear wing. Turbocharged racing engines offer the possibility to achieve equal performance with significantly lower internal inertia loading because of smaller and therefore lighter reciprocating components operating at lower speeds.


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    Title :

    Durability aspects of turbocharged Vs naturally aspirated racing engines


    Additional title:

    Haltbarkeitsaspekte von turbogeladenen Rennmotoren versus normalen Rennsaugmotoren


    Contributors:


    Publication date :

    2002


    Size :

    7 Seiten, 6 Bilder, 1 Tabelle, 2 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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