i love this list...
this stuff is amazing...
can anyone think of a way...
to install a flapper...
how would it be controlled i wonder...
pressure...revs...velocity...
cheerz terry for this insightful info...
my head is operating within a vacuum as i ponder this concept...
great stuff...simon... ;)
--- Max Rider <[EMAIL PROTECTED]> wrote: > The box on the Max is
7 liters, not bad but ideal
> would be 12. CV carbs like to operate in still air. I
> agree that a larger box helps respond to an initial
> gulp of air that the engine needs when the throttle is
> whacked open. However, the pressure will not equalize
> if you maintain full throttle. The airbox openings are
> too small for top end performance. As a rule of thumb
> for high end performance you want an opening at least
> equal to the area sum of all the carbs openings.
>
> Sportbike did a ram air test on a a number of
> sportbikes awhile back and used a non ram air zrx1100
> as a benchmark. They found that the zrx1100 (which has
> an airbox set-up similar in size to the Max) went into
> a negative 25mb pressure under full throttle. This
> means there was a vacuum in the airbox resisting flow
> into the engine. This equates to a loss of 3+
> horsepower.
>
> My own tests on a homemade flowbench confirmed the
> restriction of the airbox...dyno tests show the
> biggest difference. Roy Richards jumped 6 hp by
> dumping the airbox and going to individual filters.
> The same result with open filters may not be the same
> at high speed because the disrupted airflow under the
> dummy cover but it does illustrate that the Max likes
> to breathe...
>
> The problem with opening up the airbox is that it
> upsets the pressure differential that the carb slides
> rely on to open. The lower the vacuum the harder it is
> to raise and properly control the slide rate. The
> ideal airbox would have small openings at low rpms to
> enable the carb slides to rise quickly and then have a
> flapper open at high rpms to better feed the engine.
> Several current bikes have this...
>
> cheers, Terry
>
>
>
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peace...love...empathy....
live life to the max... :)
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