WHAT if fuel-air mixture is too rich/too lean?
overly rich mixture lowers the temperature inside the cylinder, inhibiting complete combustion of the fuel could cause spark plug fouling from excessive carbon buildup on the plugs.
over-rich mixture is usually indicated by :
- black smoke from the exhaust
(*** Blue smoke is caused by excess oil, which pass through the piston rings and being burnt in the cylinders)
- rough running of the engine
- high fuel consumption
- afterfiring (=torching) – i.e fuel igniting in the exhaust system rather than the cylinder
overly lean mixture causes detonation, which may result in rough engine operation, overheating, and/or a loss of power.
over-lean mixture is usually indicated by :
- backfiring – i.e an explosion of the fuel-air mixture either in,or back into the induction manifold.
p.S – Mixture Control (= mixture needle) controls the amount of fuel to the discharge nozzle.
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