In <GERO2655409A8F@MP050>, PHILIPPE TUSLER wrote:
>Most definitely! It is the only positive way to adjust the mixture.
>I just tuned (De-tuned) Tintin with it. Heck, it's even FUN to see
>the combustion color go from orange (Rich) to white (adjusted) to
>blue (Lean). Rev the engine and see the color phases change.
>Reminds me of that gasoline commercial where they had the engine
>with the transparent head...
>If you have any doubt, ask any three people how to adjust the mixture,
>you'll get three answers. "Adjust the mixture screw, lift the piston."
>"Adjust the mixture screw, lift the opposite piston." "Adjust the mixture
>screw, sniff the exhaust" "Adjust the mixture to maximum rpms." "Adjust
>jet to level, and screw down twelve flats"
>
Even so, with a color tune it is often difficult to nail the mixture
exactly, in that it may be too rich at idle but too lean at speed. In
general I find that, at least on a TD and an A, one needs to set the
SU's a skosh towards rich at idle to get the motor to proceed
properly.
A. B. Bonds
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