At the start of the season, teams will have to nominate all gear ratios they will be using that year. However, the gear ratios will be considerably limited. Gearboxes will be limited to 6 speeds, as they are currently. The maximum noise levels will be raised to 120 dB/A. The engines must use conventional, commercially available unleaded fuel. Throttle body internal diameters will be limited as follows: 4 cylinder enginesįuel injection pressures will be limited to 5 Bar, and spec fuel injectors will be used. Variable inlet tract systems are banned, as are variable length exhaust systems and direct injection. Throttle bodies must be circular, with a single control or butterfly valve. Valves must be of an iron-based alloy, ruling out the more expensive alloys.įuel systems are to be as conventional as possible, too. Valves will be as conventional as possible, with no pneumatic valves or variable valve timing or lift allowed. The following maximum engine speeds will be enforced using an electronics package to be supplied by the organizers: 4 cylinder engines no turbos) four-stroke engines with a maximum capacity of 600cc, using a maximum of 4 cylinders. The main points of the regulations, which are due to come into force in 2011, can be summarized as follows:Īll engines must be conventionally aspirated (e.g. Many of the proposals had already leaked out, and even been discussed publicly, but now that the basic proposals are out in full, a much clearer picture of the goal of the regulations is starting to appear. The FIM today finally announced at least a preliminary version of the rules for the new four-stroke class to replace the 250s. After his strong start yesterday, Ben Spies could only manage the 9th fastest time on the Yamaha R1, taking half a second off his time from Wednesday. The Ten Kate Honda team also made a huge leap, going 3 seconds faster than yesterday, while Shinya Nakano managed to beat his Aprilia team mate Max Biaggi once again. Haga managed to stay aboard today, after crashing three times on Wednesday. Young German rider Max Neukirchner was 2nd quickest on the Suzuki, ahead of Nori Haga on the Ducati. Once again it was Michel Fabrizio who was quickest, taking almost a second off his time from yesterday. World Superbike testing continues at Kyalami, and the WSBK regulars have picked up the pace.
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