A relief vent at the rear of the airbox is unnecessary, and if it were
to flow substantially, it could siphon from the carb stacks.
The only time you see airbox venting is in very carefully designed (i.e.
flow visualized/modelled and wind tunnel tested) situations when
extremely high speeds might cause excess drag, a la F-1 or Sports Racers
(LeMans, etc.). You will also note that those cases clearly throttle
the amount of air entering the airbox, via creative nacelle design.
As for the front-to-back argument, static pressure is static pressure,
thoughout the plenum.
- Bob Mann, '69 2000 Solex
Dan Neuman wrote:
>
> Hello All,
> I wanted to bring up the subject of making an airbox for the
> roadster. I had posted to the list about how all the 510 guys had them with
> a big tube leading to a little K&N air filter out in front of the rad. I
>guess its
> sorta a cold air induction system?? Remember??
> Everybody said that if you do that you have to cut the back of the
> box up to make sure the rear carb was not seeeing more pressure.
> My question is why does the rear carb see more pressure??
> If you have ever looked at a modern inline four motorcycle they have seperate
> carbs for each cylinder and they look darn like the solex's..four little air
>horns
> right in a row.. But they are fed by one airbox. ONe sealed airbox. This
>airbox
> must make the carbs see equal pressure. WOuld it not be possible to do the
> same thing to a roadster???
> Do you see where I am going with this?? Make the airbox thing work
> and then upstream of the airbox add one of those new style belt driven
> superchargers.....and away I go.....
>
> Boy this years AnchorSteam Xmass Ale is really really good...
>
> Daniel 69 2000-
> SF CA
--
R.W. Mann & Company, Inc. > Airline Industry Analysis and Consulting
Port Washington, NY 11050 > tel 516-944-0900, fax 516-944-7280
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