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Discussion Starter #1
If you retard the timing, then your burn may be too late and waste some of the gas charge. If the timing is too advanced, then you run the potential of negative torque. So I wonder does the timing directly impact the air/fuel ratio at idle and other points in the rpm range?

If that's right, then shouldn't timing be set to optomize the raito?
 

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Timing does not affect the air/ fuel ratio. The air/fuel ratio is measurered by the pounds of air through the carb / pounds of fuel through the venturies. It is measured before any ignition takes place.

But the A/F ratio will affect the amount of timing a motor can accept. A rich A/F ratio will tolerate too much timing with a loss of power. A lean A/F ratio will not tolerate to much timing or you will have a loss of pistons.

Always set A/F ratios first, then set timing for optimum power.
 

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some things to think about. lean makes power - too lean burns pistons. timing advanced a little late loses power - timing advanced increases power - too much advanced starts pre burn, which you will here the nocking pistons. using nos always go rich and timing retarded. to start with, then lean and advance.
 

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Discussion Starter #4
Hmmm, cam phasing and spark timing all have to do with how the charge is burned and power is made. Lots to think about.
 

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if engine runs on a computer, oxygen sensor would lean fuel to air mixture if burn not complete sensor would see rich mix. so yes timing can mess with fuel to air mix. also to hot or to cold spark plug could be a factor if oxygen sensor is on engine. no oxygen sensor no computer different problems.
 
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