> They sell Air/Fuel mixture gauges that are cheap enough
Unfortunately, the cheap ones don't tell you what you want to know. They
are only accurate right at Lambda = 1.0; which is neither best power nor
best fuel economy. "Wide band" sensors are available, but are substantially
more expensive.
> If you could get a throttle position sensor or something like
> a rheostat hooked up to a rig like this it would be very informative.
But, throttle position doesn't directly translate to piston position. You
can infer piston position from throttle position & engine rpm (with maybe
some correction for altitude/air density), but it varies with your
particular setup and how are you going to calibrate it?
These are exactly the same problems one faces when setting up a fuel
injection system. You need to know the actual airflow into the engine to
know how much fuel it needs.
-- Randall
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