Re: Airbox Mod

[DeWitt Harrison <de@aztek-eng.com>]

On Wed, 14 Jan 1998 22:49:53 -0700 (MST), Rob Obrien wrote:
>[ ... ] The idea of
>getting cool air to the box seems sound. I thought perhaps a NACA style
>duct within the character line on a 5ktq/200 hood would do nicely... but
>then I reasoned: With CIS, on a long downhill, throttle closed, wouldn't
>this blow the metering flap to full rich (thus cooking the cat and
>blackening the exhaust, I'd think) when no fuel was actually required? Or
>does the decel fuel cutoff handle this eventuality?

There is no issue here, even for those who have somehow lost their deceleration
valves. First, the flap responds to air flow; you can't fool it by increasing
the ambient pressure. Second, the amount of dynamic pressure increase
you would be talking about would be tiny at small mach numbers.

DeWitt Harrison    de@aztek-eng.com
Boulder, CO
88 5kcstq