12.10.4(i) spark plugs;
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12.10.4(j) injectors.
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12.10.6 Explain the basic principle of operation of a four-stroke internal combustion engine.
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12.10.6 Explain the basic principle of operation of a four stroke internal combustionengine.
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12.10.8 Describe the correlation between engine rpm and power output.
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12.10.10 Explain the need for valve timing (i.e. valve lead, lag and overlap).
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12.10.12 Explain the basic differences between compression ignition (diesel) engines and conventional ignition engines.
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* * * Carburation * * *
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12.12 Carburation
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12.12.2 Explain the principle of carburation.
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12.12.20(c) correct use of carburettor heat for de-icing, and as an anti-icing measure
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12.12.4 Explain the basic principle of operation of a simple float-type carburettor.
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12.12.6 State the function and/or purpose of the following within the carburettor:
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12.12.6(a) atomisation and diffusion;
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12.12.6(b) idling circuit;
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12.12.6(c) acceleration enrichment;
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12.12.6(d) enrichment at high power settings;
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12.12.6(e) mixture control;
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12.12.6(f) idle cut-off.
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12.12.8 Explain the function of a manual mixture control and idle cut-off.
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12.12.10 Explain the correct operational use of a manual mixture control and idle cut-off.
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12.12.12 Explain the consequences of operating with:
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12.12.12(a) over-rich mixture settings;
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12.12.12(b) over-lean mixture settings.
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