Scott,
Carburetors tend to calibrate themselves to varying conditions since
the air flow draws the fuel into the air stream. That is not to say that
rejetting is not required, but I have found that the same carburetor
will work well over a wide range of engine sizes with out rejetting, as
well. Of course, you reach a point where adjustments are needed.
Mechanical fuel injection is totally dependent on physical adjustments
to varying conditions. Even so, we find that our jetting is basically
the same at El Mirage and at Bonneville. Air density is the key and that
depends on temperature, humidity and altitude. I have seen days at
Bonneville when relative altitude was under 3000 ft. and days when it
was over 9000 ft. Just my 2 cents worth.
Tom, Redding CA - #216 D/GCC
Scott Cowle wrote:
> At Maxton I asked a couple of the racers, John Beckett and The Turk Team
> if they found it necessary to recalibrate their carbs for the altitude at
> Bonneville, and I was suprised to hear both of them say no.I have heard it
> said and read a million times that the kind of altitude at Bonneville
> requires a significant recalibration. Can anyone else shed some light on
> this for me. I'm going to Bonneville in 2 years and am in the planning
> stages, so decisions about induction etc need to be made soon. Also are
> there any or many landspeed racers using 2x4 carb set ups?
> Scott
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