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AMSOIL Powersports Oils Provide
Superior Wet-Clutch Performance
By definition.
a clutch is a coupling used to connect and disconnect the
driving and driven parts of a mechanism. Modern motorcycles
and ATVs require the use of a clutch to connect and disconnect
the engine (driving) and transmission (driven). Without the
clutch, there would be no way to stop the vehicle from moving
without also stopping the engine. The clutch also makes shifting
easier and minimizes stress on gears and other components,
extending equipment life
Why a Wet-Clutch?
The clutch is a
frictional device, meaning it requires friction to complete
the task of connecting the engine and transmission. Because
a clutch is a frictional device, and one of the main purposes
of lubrication is to reduce friction, why would anyone introduce
oil to a clutch? Modern technology and superior technological
know-how have afforded the ability to formulate multifaceted
lubricants capable of functioning in a variety of conditions.
While not all lubricants are suitable for use in wet-clutch
applications, an oil-immersed clutch benefits from the lubricant’s
ability to reduce operating temperatures, prevent the formulation
of deposits and clean internal components. All of these benefits
lead to better performance and longer life.
Clutch
Slip
Clutch slip is
a big concern with many powersports enthusiasts. To the operator,
clutch slip feels like an elongated shift or a delay in the
transfer of power from the engine to the wheels. This is due
to a lack of friction generated within the clutch pack.
The clutch pack
is located between the clutch’s inner hub and the clutch
basket and consists of a series of two types of plates: steel
and frictional. The inner-most plate is a plain steel plate
(sometimes aluminum) which attaches to the inner hub via tabs
on the plate’s inner diameter, and the inner hub is
connected to the transmission. The next plate is a frictional
plate which attaches to the clutch basket via tabs on its
outer diameter, and the basket is attached to the engine.
The friction plates are coated with a fibrous compound that
helps them grip the steel plates when the clutch is engaged.
The plates within the pack alternate until the desired pack
height is reached.
A spring-loaded
pressure plate atop the clutch pack applies constant force
to the clutch pack. The mechanical device that engages and
disengages the clutch assembly, normally a lever located on
the handle bars, pulls the pressure plate back and allows
the plates within the clutch pack to separate, severing the
connection between the engine and transmission.
The clutch is only
disengaged in order to stop the transfer of power from the
engine to the wheels. When engaged, the clutch spring applies
a constant load on the pressure plate, forcing the clutch
pack together. The load creates a high level of static friction
between the plates in the pack, causing them to rotate together.
In this position, rotational movement from the engine is transferred
to the clutch basket, to the frictional plates, through the
steel plates, into the inner hub and finally to the transmission
input shaft. The key here is the static friction that holds
the frictional and steel plates together, allowing the transfer
of power from the engine to the wheels. Clutch slip occurs
when the static friction is overcome and the plates rotate
at different speeds, or slip.
Common
Causes for Clutch Slip
While it seems
logical to blame the lubricant for clutch slip, there are
many possible causes. Worn friction plates, glazed clutch
plates, loss of clutch spring tension, improper clutch pack
height, engine modifications, operator error and the use of
an incorrect lubricant all are potential causes for clutch
slip. If a lubricant with the correct frictional properties
is used, it is the least likely cause of clutch slip.
Wet-Clutch
Compatibility
Wet-clutch compatibility
is determined through standards set forth by the Japanese
Automotive Standards Organization (JASO) and the International
Organization for Standardization (ISO). Both standards categorize
oils according to their frictional properties, allowing consumers
to choose the appropriate oil based on which JASO or ISO category
is recommended by the equipment manufacturer. If no JASO or
ISO category is listed on an oil, it is likely that compatibility
in wet-clutch applications has not been reviewed. These oils
should not be used in wet-clutch applications.
AMSOIL
and Wet-Clutch Compatibility
The frictional
characteristics of all AMSOIL powersports oils have been fully
reviewed using the test methodology set forth in JASO standard
T903:2006 sub-standard T904 and ISO standard 24254:2007. While
clutch slippage and wet-clutch compatibility are major concerns,
it is important to choose an oil that provides maximum protection
and performance for other lubricated components as well. A
good oil must not only offer the necessary frictional properties,
but also minimize operating temperatures and reduce the formation
of varnish and lacquer. A good oil must also maintain plate
cleanliness, provide good anti-foaming properties and superior
shear stability. These are characteristics offered by AMSOIL
motor oils for powersports applications.
According to AMSOIL
Technical Product Manager, PowerSports Dave Anderson, choosing
and oil that provides balanced protection is paramount. “Different
pieces of equipment have different appetites for fluids,”
said Anderson. “In order to obtain the best performance
for any piece of equipment it is important that the fluid
is formulated to address the main concerns for that application.
That is one of the key reasons AMSOIL provides the variety
of products it does.” Anderson said testing is the key
to ensuring AMSOIL products excel. “Our desire is to
provide the best possible performance we can technically provide,”
said Anderson. “Many AMSOIL powersports products are
very application-specific because, from a technical standpoint,
that’s that only way we can provide the highest level
of performance possible.” For more information regarding
wet-clutch performance, refer to the AMSOIL
Technical Service Bulletin Wet-Clutch Operation and Lubrication
Requirements. For more information regarding
the performance characteristics of AMSOIL Motorcycle Oils,
refer to the AMSOIL white paper A
Study of Motorcycle Oils.
Articles
Testimonials
Motorcycle
Testimonials
Business
Opportunity Testimonials
From
The Presidents Desk
AMSOIL
Synthetic Diesel Oil Articles and Testimonials
Premium AMSOIL
Synthetic Motor Oils offer the longest drain intervals
on the market, unsurpassed protection and performance that
effectively extends equipment life and improved fuel economy,
saving customers money at the pump and reducing the nation’s
dependence on foreign oil.
"AMSOIL
INC. warrants that the use of its lubricants will not cause
mechanical damage to any mechanically sound equipment when
AMSOIL INC. products are used in full compliance with the
company's recommendations and instructions."
FULL
WARRANTY
AMSOIL
synthetic motor oils are formulated to surpass engine test
specifications, offering protection far greater than competing
motor oils for extended drain intervals. Most synthetic oil
manufacturers make no claim to extended drain intervals, deferring
to the maintenance schedule provided by the vehicle manufacturer.
With its unparalleled oil and warranty program, AMSOIL offers
consumers unprecedented protection and economics.
Another
AMSOIL First
More than 20 years
ago, AMSOIL began using the NOACK volatility test as a comparison
tool and measurement of quality. Back then, nearly every oil
tested side-by-side with AMSOIL synthetic motor oils failed,
and those that passed barely squeaked by. Other oil companies
paid no attention to NOACK results until Ford Motor Company
made it a requirement for service fill oils, validating what
AMSOIL had said all along.
THE
NOACK Volatility Test
The NOACK
Volatility Test determines the evaporation loss
of lubricants in high temperature service. The more
motor oils vaporize, the thicker and heavier they become,
contributing to poor circulation, reduced fuel economy
and increased oil consumption, wear and emissions. AMSOIL
Synthetic Motor Oil resists high temperature volatization
better than other motor oils. AMSOIL Synthetic Motor
Oil maintains peak fuel efficiency and reduces oil consumption
and emissions. |
AMSOIL Now An ISO Certified
Manufacturer
AMSOIL recently
received ISO 9001:2000 certification of our Quality Management
System (QMS). NSF International Strategic Registrations is
the registrar that has verified our QMS meets the requirements
of the ISO 9001:2000 standard, the most widely utilized quality
standard throughout the world for quality management systems.
ISO standards are used by over 300,000 companies worldwide
setting rigorous standards for businesses, government and
industry.
ISO 9001:2000
is applicable to any manufacturing and service organization
providing a framework for system development that focuses
on the customer, quality system performance and ongoing improvement.
AMSOIL received ISO 9001:2000 registration under the scope:
synthetic lubricants blending, packaging, and other fulfillment
directly associated with lubricant product.
The ISO
certification puts AMSOIL in line with some of the most efficient
companies in the world. It is further assurance that the products
and services AMSOIL provides will continue to maintain the
high level of quality the company always demanded.
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