Engine General Description - Suzuki F6A Service Manual

GENERAL DESCRIPTION
ENGINE
1. The engine is a water cooled, in–line, 3 cylinder, 4–stroke gasoline unit with its S.O.H.C. (single overhead camshaft)
valve mechanism arranged for "V"–type configuration with12 valves (2 intake and 2 exhaust valves per cylinder).
The single overhead camshaft is mounted over the cylinder head; it is driven from the crankshaft through the timing
belt. Unlike conventional overhead valve (O.H.V..) engines, this engine has no push rods. Thus, drive for valves is
more direct and enables the valves to follow the crankshaft without any delay.
2. The distinctive features of the engine may be summarized as follows:
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Because of inlet and exhaust ports arranged for cross–flow pattern, with valves located in "V"–type configura-
tion, both volumetric and scavenging efficiencies are very high.
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The combustion chamber formed between piston crown and cylinder head is of a pent roof type. This feature
is calculated to make available greater horsepower from a lesser amount of fuel.
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The supports for camshaft and rocker shafts are integral with the cylinder head, so that the valve mechanism
noise is markedly reduced by the structural rigidity and, moreover, that the number of valve mechanism parts
is reduced, let alone a more compact size of the engine.
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The timing belt for driving the camshaft runs quiet and is light in weight.
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A high–grade cast iron is used for the material of the cylinder block. The block is shaped to present deep skirts
and retain greater rigidity.
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The crankshaft is a one–piece forging, and is supported by four bearings for vibration free running.
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Heating by hot water is employed for the inlet manifold in order to facilitate fuel carburation and insure that uni-
form distribution of the mixture. The higher combustion efficiency of this engine is largely explained by the inlet
manifold feature.
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