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Exhaust Modifications
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Exhaust Modifications |
The role of the exhaust system is to take the
spent gases away from the engine and allow for the next amount
of the fuel air mixture to be drawn into the cylinders and go
thru the ignition, burn, power and exhaust cycle. If the exhaust
system is constricted then the burnt mixture is not all
exhausted from the cylinders and hence there is less room to
"get more in". Less in, equals less power and huge
inefficiencies in the operation of the engine.
To remedy this issue and provide easier breathing for the
engine, a larger exhaust can be fitted. Exhaust sizes up to 2.5
or 3 inches (67mm to 75 mm) will improve the flow of exhaust
gases from your engine however a common mistake is to retain the
existing muffler. Exhaust size increase only, will give a small
increase in engine power however, combined with a free flowing
muffler will deliver considerably more increase in power.
It is also better to opt for a "mandrel" bent exhaust. This
means that all of the bends in the exhaust are of the same
diameter as the pipe itself. Under normal circumstances exhaust
pipes are bent and the pipe deforms slightly in the area of the
bend, the tighter the bends the more the pipe deforms and the
smaller the diameter of the pipe at the bend. This means your
huge 3" exhaust is maybe 2.75" on some bends introducing
restrictions to the exhaust gases, eddy currents in the gas and
overall reducing the effectiveness of the exhaust system.
Mandrel bent exhausts avoid this and maintain the diameter of
the exhaust for the entire length of the system. |
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