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Once all the bolt-on parts have been added to your turbo car it is
time to go internal in the search for more power. One technique to increase
power is to improve the flow characteristics of the cylinder heads by
porting and polishing. The head is the gateway to to the combustion chamber.
The shapes of the ports in the sides of the cylinder head and the length
and diameter of the runners back into the back of the inlet/exhaust valves
has a huge bearing on the overall efficiency of the engine. Some handy
gains can be made simply by cleaning up the factory castings and machining
marks in the cylinder head, which ultimately decreases turbulence of the
air flow. Inlet port matching is also useful, as the factory rarely lines
up the inlet manifold with the cylinder head perfectly. Each mismatch
creates a turbulence which lowers air flow capability. This type of work
needs to be done by an expert, with the aid of a flow bench, as it is
just as easy to lose power as gain power from this type of work. Gains
of between 10-15% have been experienced on late model Turbo Japanese cars.
The cost of this exercise is between A$1000-$1500. Photos will be available
soon.
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