Alan,
Temperature, humidity and the local barometric pressure affect air
density, and overall engine performance and behavior. How does the
engine know whether the mixture came through the slow run valves or the
throttle plates?
My BJ8's idle varies depending on the aforementioned conditions, but
only slightly unless I get a few thousand feet above my usual sea level
conditions, or it is exceptionally hot (lower air density). It is
always steady and smooth.
bs
Alan Seigrist wrote:
> On HD8s, cracking the throttle plates open works ok but bypasses the
> purpose of the slow run valve, which is to give you a nice steady &
> smooth idle. If you crack the throttle plates open, you'll have a
> couple hundred RPM variation depending on temp / conditions, etc.
> Incidentally on a car with triple HD8s like an S1 E-Type you'll never
> get idle below 800 or so if you crack open the plates.
>
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
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