BALANCE SHAFT BEARING SET 4G63 TURBO

Description

Heavy Duty Cam
Bearings

In
the last decade or so engine
development has increased
dramatically. Each time an
existing engine is revised or
a new engine is developed, it
pushes the limits of what its
predecessor could produce
both in horsepower and torque
as well as fuel efficiency.
With these gains, comes an
increased load on the
internal parts of these
engines. One of these parts
that are continually asked to
perform under greater and
greater pressures is the cam
bearing. In engine
configurations such as V6’s
and high RPM 4 cylinders, the
cam bearing is a vital link
along the path of the engines
oiling system. If a cam
bearing wears out prematurely
the engine loses some of its
oil pressure, which we all
know can lead to premature
engine failure. Other
problems, which can be caused
by premature cam bearing
wear, are excessive cam lobe
runout, impropertiming, and
generally poor running
conditions. This is where
strength and durability
become key issues. This is
why, in most applications,
the O.E. manufacturers have
turned to higher performing
cam bearing materials.
Traditional Babbitt can only
withstand up to 1800 psi.
Clevite’s AL-3 material can
withstand up to 5000 psi.
Quite a difference. When
trying to adapt Babbitt to an
application that requires a
more durable material, extra
oil grooves are needed on the
outside diameter of the
bearing itself to help get
oil to the rest of the
engine. This only addresses
the oil starvation symptom
inherent to the real problem
of premature wear. All of the
other symptoms that were
listed above still occur with
the right material for the
job, such as Clevite’s AL-3,
these extra oil grooves
aren’t needed at all. In fact
this gives more bearing
contact area to the block to
help in transferring heat
away from these parts and
prolonging bearing and engine
life. Remember, when strength
and durability is part of the
question, Clevite is the
answer.

On certain
modified performance
applications Clevite also
offers a TriMetal cam bearing
material (TM-1) that provides
even greater strength and
durability. These cam
bearings are able to
withstand loads in excess of
8,000 psi, while providing
surface characteristics that
are very forgiving and
conformable.