Our Flow Bench and Dyno Research
revealed a need for a Small Port design that has a
lot of Velocity and Air Speed. When the velocity in
a port is increased you achieve more Cylinder Fill,
this in turn creates Torque and that produces
Horsepower.
Cylinder Fill:
the amount of air/fuel volume that is achieved
in a certain area in a controlled amount of
time, in this case the given amount of time is
the time in which the camshaft is open (from
.000" - .650") per valve per sequence.
Torque:
the moment of a force; the measure of a force's
tendency to produce torsion and rotation about
an axis.
Horsepower: a unit of power in the U.S.
Customary System,
equal to 745.7 watts or 33,000 foot-pounds per
minute.
Most cylinder heads today are ported to try and
achieve large air flow numbers from .400" -
.650" lift. But by having big air flow numbers
at these lifts, air flow is sacrificed in the
cam lift range of .100" - .400" and you must rev
the engine at a much higher R.P.M. to keep it in
the power curve.
Hot-Shot Motorworks has learned that the optimal
port is to obtain the largest total accumulated
amount of air flow through the port within the
total lift of one valve sequence. How we obtain
this number is to add all of the air flow
numbers at each given lift of the camshaft from
.100" - .600" lift, this is the amount of
air/fuel mixture that is being passed through
the port to fill the cylinder and combustion
chamber. The higher the number, the more
cylinder fill you have achieved and this is what
creates torque.
Don't be
mislead
with large air flow numbers at maximum lift.
