on 7/2/00 12:15 PM, TC at [EMAIL PROTECTED] wrote:
snip
I agree with that concept,
> (pulling bowl vent hoses), but it depends what you want to do ... it
> is different for every setup. If you are trying to equalize your fuel
> curve etc ... fine ... but if you are having a hard time getting fuel
> out of the fuel bowl in the first place I think I would strive to see
> that the most positive pressure possible appear at the end of these
> hoses.
snip
> ......
> campbell
Hey TC,
Wonderful explanation of the way a CV carb works. Should become standard
reading matter for all bikers who have CV's. Had me thinking how useful an
"air's eye" view of a CV carb would be, to show folks the relationship
between throttle and slide. It'd be cool to put a high-speed video camera
above the intake throat, another one below the throttle plate. I suppose a
nice animation would work too. (The quadrajet analogy brought back some
really nice memories, too.) You might be able to take the analogy further by
comparing vacuum secondaries with mechanical ones, as in CV's equal vacuum
secondaries and flatslides equal mechanical.
Anyway...the placement of the bowl vent hoses, next to the Y openings
strikes me as being odd from a pure performance standpoint. (I suspect that
they're put where they are for emissions purposes.) It appears to me, at
cursory glance, that NEGATIVE pressure is created in the hoses, rather than
positive, by the action of high-velocity air blowing at 90 degrees across
the openings.(The effect is reduced, of course if you remove the Y.) And the
maximum negative pressure would occur at maximum airflow - exactly when you
want the opposite. I suspect the bernoulli effect is considerably greater
than the "ram air" pressurization of the under-cover area. If you put a
straw in a jar filled with water and blow across it at 90 degrees with an
air compressor....
Whaddya think?
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