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Port matching an intake manifold for an overbore throttle
body
When trying to maximize your engine’s output, a larger
throttle body becomes a necessity. Factory engines often
bottle neck airflow at the throttle body restricting
airflow. An engine short on air will fall short of its
potential horsepower. While modified engines see the largest
gains from induction modifications, a stock engine will
still benefit from a throttle body upgrade. A larger
throttle body is a good compliment to other induction
enhancers, such as intake systems and larger turbochargers.
When upgrading your throttle body there are several issues a
person may run into. They range anywhere from sensors and
solenoids not fitting to port size of the throttle body and
manifold. We are only going to address the port size here.
When installing a larger throttle body on your intake
manifold it may be necessary to port the intake manifold's
inlet to match the new throttle body.
For this article we will be match porting a 1995 Mitsubishi
Eclipse for a 1993 throttle body . This task can be
accomplished either on the vehicle or off. If you plan on
doing this on the car mask off the entire engine bay and
block off the intake manifold with rags. Be sure to vacuum
ALL the shavings out of the manifold once porting is
complete. Getting aluminum shavings into the motor will
cause damage. The porting process will send material all
over so it is a good idea to cover up the entire engine bay
to keep clean up time to a minimum. |
