stuve leyendo mas detenidamente y vi que queres poner cuerpos de 45? me parece mucho y te paso algo que te puede servir:
Choice of bore size is a balanced compromise resulting from the following;
1) A larger bore leads to lower flow resistance, but obeying the laws of diminishing returns.
2) A smaller bore leads to better throttle control and response (never underestimate) and improved fuel mixing.
3) The system should be considered in total - from (at least) trumpet flange to cylinder and proportioned accordingly.Basic references for BHP per cylinder, assuming ca 120mm from butterfly to valve head and a max of 9,000 rpm are;
Up to 30 BHP - 30mm, up to 33 - 32mm, up to 39 - 35mm, up to 46 - 38mm, up to 51 - 40mm, up to 56 - 42mm
Up to 65 - 45mm, up to 74 - 48mm, up to 80 - 50mm, up to 87 - 52mm, up to 93 - 54mm.
These power figures may be increased by up to 10% in a purpose designed and well proportioned system.
As butterfly to valve distance increases, butterfly size will need to increase in proportion to system taper and vice versa.
Lower revving engines and those with injectors placed before the butterfly will generally accept a larger body.
en castellano te dice que con 45 vas a usarlo con un motor de 260bhp mas menos 10%. Crees que tu preparacion llega a esa potencia? yo fui mas conservador y tambien me interesaba que ande la baja!!!! asi que le puse cuerpos de 42mm. 2 mecatrol de 42mm y a armarse de paciencia para dejarlo bien mas que nada en las mariposas.
hay gente que le puso los keihin de moto, la verdad que no se sobre esos burcas pero hay un user que los tiene aca en el foro. buscalo en proyectos.
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