The long-awaited rules for the replacement of the 125cc class were announced at Valencia on Saturday, with the details finalized for the 250cc four-stroke formula. The rules contain few surprises from the information that has leaked out over the past few months, with the thought process behind it very clear: a lot of technical regulations have been imposed to avoid the costs from spiraling out of control.
The most important technical restrictions are in the engine, the fuel supply and ECU. The 250cc four-stroke engine will have a maximum bore of 81mm - the same diameter as the 1000cc MotoGP bikes from 2012 - and a hard rev limit of 14,000 rpm. In addition, the engines will have only 4 valves, with the camshaft driven by a chain, and variable valve timing or exhaust valves banned. Fuel pressure will be limited to 5 Bar, and a standard fuel spec will be imposed. Only two injectors will be allowed, and variable-length inlet tracts (as seen on several street bikes nowadays) are also banned. Most interesting of all is that the rules stipulate that the throttle valve must be operated directly by mechanical means only from the rider's wrist.
No comments:
Post a Comment