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Polini s’aventure également dans les catégories de cylindres au-dessus de 70 cm3. Avec le BigEvolution 52 mm, Polini introduit deux cylindres, soit de 84 cm3 (c’est-à-dire avec une course d’origine de 39,3 mm) soit de 94 cm3 (ce qui nécessite un vilebrequin à course longue de 44 mm). L’alésage est ici de 52 mm, soit 2 mm de plus que les cylindres BigBore de Malossi, ce qui est pratiquement le maximum que l’on peut aller avant d’avoir des problèmes avec les goujons du cylindre. La forme extérieure est la même que celle utilisée pour les nouveaux cylindres Evo IV. En termes de performances, la version 84 cm3 devrait être au même niveau que le cylindre 70 cm3, avec un couple nettement supérieur. Si vous en voulez plus et que vous n’avez pas peur de retravailler le carter, nous recommandons la version 94 cm3 en association avec un vilebrequin à course longue de 44 mm avec une bielle de 85 mm, qui offrira des performances dans la région supérieure de 20 ch.
Polini also ventures into the cylinder classes above 70cc. With the BigEvolution 52mm, Polini introduces two cylinders, either with 84cc (which means with original 39.3mm stroke) or with 94cc (which requires a 44mm long-stroke crankshaft). The bore here is 52mm, i.e. 2mm more than Malossi’s BigBore cylinders, which is basically as far as you can go before you get into trouble with the cylinder studs. The outside shape is the same as the one used for the new Evo IV cylinders. Performancewise, the 84cc version should be on one level with the 70cc cylinder, with noticeably more torque, though. If you want more and don’t mind re-working the crankcase, we recommend the 94cc version in conjunction with a 44mm long-stroke crankshaft with 85mm connecting rod, which will yield performance in the upper 20hp region.
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