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Re: LM-1....OR SIMILAR CARB TUNING EQUIPMENT???
[Re: 440Jim]
#871191
12/05/10 02:54 PM
12/05/10 02:54 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I agree with Raff, the no load idle should be able to run close to Lambda=1.0 (stoichiometric), which on gas is 14.7 A/F. However, depending on the carb circuits, you may need a touch richer for throttle transition, etc.
Although I am running E85, I have leaned it out for no-load idle, and high idle around the pits at Lambda=1.0. This is primarily to put heat in the motor, but it is clean. However, my mechanical injection is much richer with the fuel valve in the full "ON" position for racing because of the simple way the system works.
Remember, the A/F numbers are just for reference when tuning. There is no magic number(s), just typical ranges like
idle 13.0-14.7
WOT 12.0-13.0
One of the nice things about recording A/F vs RPM is you can tune the fuel curve of your carb (air bleeds, jets, emulsion, etc). For example a carb at WOT might be 12.5 at 4000 rpm, but 11.5 (or 13.5) at 7000 rpm.
Jim maybe you would know.... is there a add on to
upgrade my LM-1 to record the data and rpm
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