The cylinder head is the monolithic type
made from aluminium alloy. The two valves per cylinder are mounted
in their respective guides, operated by a camshaft via mechanical
tappets and adjustment shims.The valve guides are installed by interference
fit in their seats in the cylinder head.The inner diameter is finished off after
assembly, using a specific reamer.The cylinder head gasket is of the Aramide
fibre type, and there is no need to retighten the cylinder head
at all during the life of the engine.The following elements make up the cylinder
head:camshaftcamshaft bearingstappetslubrication pipeinlet and exhaust valvesvalve guidesvalve borestappet coverstuds for fixing exhaust and intake manifoldsThe cylinder head contains: the intake manifolds
(with Venturi pipe shaped profile) (1); the exhaust manifolds; the
valve openings; the coolant flow openings; the lubricant flow openings;
the spark plug threaded openings; the openings for fastening to
the engine block and the combustion chambers.
The head is the component which closes the
cylinder; it contains the combustion chambers, where the air-fuel
mixture is compressed and ignited; very high temperatures are reached
here (average values 2300 ° C approx). For this reason aluminium
alloys are used in the construction of cylinder heads as they are
light, resistant to compression and have high termal conductivity
properties.The use of this material makes it possible
to increase the compression ratio, moving away from the detonation
point, because the heat is dissipated more rapidly away from the
hot spots.
