|Porting and polishing
Question : CAR enthusiasts talk about "porting and polishing" the cylinder head. I don't really know
what that involves, but I've been told that
doing so would boost power and fuel economy. Kindly elaborate on the terms and tell
me if modification can be carried out, legally,
on a vehicle.
A COMPETENT DIY enthusiast can successfully
port and polish a cylinder head at home.
Porting refers to the removal of small amounts
of metal along the inlet and exhaust ports
(tracts) of the cylinder.
This mild reshaping of the cylinder head
reduces the restriction to airflow in and out of
the engine, and results in increased horsepower and lower fuel consumption, as well as a
Porting can be carried out using simple tools
such as hand files and grinding stones. But care
must be taken not to remove too much material, because that will weaken the cylinder head
Polishing refers to the smoothening of the
cylinder walls. Again, this is a simple task that
can be carried out using files and grinding
stones. With smoother walls, there's less resistance to airflow.
Porting and polishing go hand in hand and
while the tasks are not difficult, they are time-consuming. They are not modifications in the
true sense of the word and can be carried out
on any road-going vehicle.