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Non turbocharged vehicles can benefit greatly
from fitment of extractors. Extractors replace the exhaust
manifold on the engine, which is like a common "rail" which
direct exhaust gases from each cylinder out a single exhaust
pipe connected to the manifold. Extractors have separate pipes
for each cylinder, which are often tuned to ensure that there is
maximum efficiency in eliminating exhaust gasses from the
cylinder head. Some extractor systems are designed in such a way
as to create lower pressure near the cylinder head with a
venturi effect to actually help draw spent gasses from the
cylinder. The effectiveness of extractors can be dependent on
their "tuning" with some extractors more effective at relatively
lower rev ranges - whilst others are tuned for higher
performance and higher revs. Generally however, extractors are
most effective in the upper rev ranges.
Extractors are traditionally used on petrol motors however they
are also applicable to non-turbocharged vehicles however for my
money, the fitment of a turbo to a diesel vehicle would be a
more effective performance solution. Due to the higher
compression ratio of diesel motors, performance is generally
less affected by back pressure in the exhaust manifold,
therefore diesels show less of a performance improvement than
petrol engines from extractors. A petrol motor with its lower
compression ratio is more affected by backpressure in the
exhaust manifold.
Larger exhaust, extractors and free flow mufflers also have the
added advantage of lowering running temperatures of vehicles due
to getting rid of the hot gases faster. |
