Working off of Terry's comments, adding another opening in the airbox should
not be that difficult. If the desired RPM activation range is in sync with
the Vboost servo actuation then couldn't you tie into that. Just fabricate a
butterfly type valve in the top of your airbox with a cable actuation
mechanism that is "Y'd" off of the V-boost servo cable.
Perhaps I'm completely out of my mind on this one but it just might work.
Comments anyone?
----- Original Message -----
From: Terry and Pat Hayden <[EMAIL PROTECTED]>
To: V-MAX TECH LIST <[EMAIL PROTECTED]>
Sent: Wednesday, March 08, 2000 1:33 AM
Subject: Re: Drilling Slides
>
> -----Original Message-----
> From: TC <[EMAIL PROTECTED]>
> To: V-MAX TECH LIST <[EMAIL PROTECTED]>
> Date: Tuesday, March 07, 2000 2:41 PM
> Subject: Drilling Slides and Reversing the Process.
>
>
>
> >On the other hand ... take the "Y" off the Vmax and don't do anything
else
> and see where your low end response goes ... check the mid-range on the
dyno
> .... As you well know it is not uncommon for some of it to disappear but
> often give you an additional horse on the top. <
>
> TC has hit the nail on the head...the CV carb is great for the street
> because it can be set up to deliver the right amount and of fuel and air
> proportional to engine demand regardless how much the driver has twisted
the
> throttle plates open at any given rpm. But in order to reduce the effect
of
> the many different environments that the bike will be sold in, the
> manufacturer generally relies on a large pressure differential between the
> carb throat and the venturi to move the slide and to draw fuel. Small
airbox
> entries help to maximize this differential under heavy load conditions. In
> fact it is not uncommon for a stock airbox under full load to be 25-30mb
> BELOW standard air pressure (70 mb = 1 psi). However, for obvious
reasons,
> having an airbox with negative pressure is not conducive to getting air
into
> the engine. Opening up the box relieves the pressure but as TC pointed
out,
> it plays havoc with how the slide opens and how much fuel is drawn and
often
> ends up dropping the midrange. A balance can be found if you pay close
> attention to each carb circuit and need to match fuel with air...yes,
> Factory or Stage 1 or stage 7 jet kits can be made to work with the Max.
I
> always keep in mind that power is usually made with some form of
compromise.
> Nothing is free. The more you move away from stock the more finicky your
> bike is going to be...
>
> However, as an aside...some manufacturers are now relying on a great trick
> that would be nice to mimic on the Max using the v-boost servo. At an rpm
> less than a full carb slide opening, the airbox entry remains stock
(small).
> When you get on the throttle, the pressure diff created by the small box
> opening helps to draw the slide up fast and still keep the fuel going.
Just
> as the box is starting to go into starvation mode though, an additional
> airbox port opens to flow more air. The main circuit is set up for this
> additional air and the bike gets a second wind... Low end grunt and top
end
> power both!!
>
>
> cheers, Terry
>
>
>
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