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KENLOWE
thermo electric fans are produced in a number of sizes to
suit a wide range of vehicles - 4x4's only need a fan for
approximately 4% of your total motoring time. The advantages
in replacing the belt driven fan are shown in the following
pages - if you overheat in the summer you can use the KENLOWE
thermo electric fan with the belt driven fan either year round
or just in the summer months.
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OVER
COOLING
Many
vehicles running a fixed or viscous belt-driven engine fan fail to
reach efficient working temperatures on long journeys, and on short
journeys the engine can be so cold in winter that enrichment is needed
throughout - any vehicle running a fixed or viscous belt-driven fan
and no history of overheating can benefit by simply unbolting the
fan (leaving the hub/pulley to drive the water pump) and fitting a
KENLOWE thermo electric fan to provide cooling only when needed. The
many advantages are significant and have been proven over 40 years,
since the concept was first pioneered by the KENLOWE Group and which
today is adopted as standard on over 80% of the world's production
cars. |
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IMPROVED
ECONOMY
Any
engine driven auxiliary consumes power and the fixed or viscous fan
is no exception. Research, initially by KENLOWE and subsequently by
the specialised motoring press and the vehicle manufacturers, have
established that significant fuel savings are achieved just by removing
a fan that works all the time (including viscous fans) even though,
on average, fan assisted cooling is only needed for around 4% of motoring
time. The energy absorbed in driving the fan is not the only reason
why around 8.5% fuel saving is available by removing the fixed or
viscous fan - a much quicker warm up reduces the time to half, that
the engine is on rich mixture (this also applies to fuel injected
engines). Achieving a hotter more thermally efficient combustion is
also an important aspect in the drive towards a fuel efficient engine.
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MORE
PERFORMANCE
It takes around 8.5% of the engine power output to drive a belt driven
fan that is unnecessary for an average 96% of the time. Removal of
the fixed or viscous fan means around 8.5% less fuel is needed for
the same performance or around 8.5% extra power is available to improve
performance. For example the energy used to drive the belt-driven
fan on motorways or climbing in low gear at high revs is significant
as the energy absorbed by the fan goes up by the cube of the speed.
The belt-driven fan on almost all cars consumes around 8.5% of the
total energy developed by the engine. On large 4x4 off-road vehicles
that can be a lot of b.h.p. and all because the vehicle manufacturer
had to assume the owner may cross the Sahara towing 2 tons morning,
noon and night! Removal of the beltdriven fixed or viscous fan releases
this power for safer overtaking, easier climbing and a more flexible
and free revving engine. |
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LESS
NOISE
Belt driven fixed or viscous engine driven fans exist to provide artificial
cooling in traffic when the engine revs are limited to tickover, which
is why the size - diameter, pitch, width of aerofoil, etc. has to
be large enough to compensate for the slow revs of the engine in traffic.
Unfortunately, this means that when the vehicle is travelling on the
open road and the fan speed rises in proportion to increased engine
revs, the air roar from the fan increases until on the motorway the
noise can become tiring and sufficiently intrusive to make conversation
difficult. For example on a 4x4 off-road vehicle, removal of the belt-driven
fan - not needed for 96% of the time, makes the vehicle NOTICEABLY
quieter. Whilst viscous clutch fans slip a little at high revs this
is usually at revs which equate to speeds well above 70 m.p.h. "Autocar"
reported, during a test on a saloon car fitted with a KENLOWE fan,
that the absence of fan noise makes any journey far less tiring! See
viscous clutch fan section on this page for further details.
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IMPROVED
COMFORT AND SAFETY
Belt-driven fixed or viscous slip clutch fans blow cold air over the
surface of the engine during the first few miles of running from cold,
doubling the time the engine takes to deliver comforting heat to the
interior and warm air for effective demisting. In addition, whilst
on choke or on fuel injected engines, during the period of enriched
mixture, the engine is either over-revving or near to stall during
those first few awkward miles from cold when most have to negotiate
busy intersections. Removing the belt-driven fan ensures that warm-up
can be up to twice as fast so that even short journeys can be safer
and more comfortable! |
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ENVIRONMENT
KENLOWE have promoted the fuel saving properties of thermo-electric
engine-cooling fans in place of the continuous belt-driven fan, for
over 40 years, resulting in a large number of vehicles made today
being fitted with the KENLOWE concept as standard. This currently
reduces vehicle gas pollution by nearly 10% per annum on over 85%
of the world's car production which use the KENLOWE concept. However,
there is still a number of vehicles produced, or running on our roads,
with fixed or viscous belt-driven fans, wasting around 8.5% of the
fuel used. This depletes world energy reserves and adds to pollution
- particularly during the period from cold start to full operating
temperature, when fuel consumption can be up to double that of a warm
engine! In this condition up to half the fuel is passed unburnt into
the atmosphere, after heating, as ozone damaging hydrocarbons.
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CATALYTIC
CONVERTERS DO NOT WORK WHEN COLD!
The Daily Telegraph reported that "catalytic converters which are
made from expensive platinum and rhodium do not remove the hydrocarbons
which damage the atmosphere when the engine is started and run cold!"
They also reported that "one quarter of all travel is carried out
with a cold engine!" In addition some catalytic converters actually
incur a fuel penalty and cause more pollution when the engine is cold
than cars not fitted with a catalytic converter! |
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CATALYTIC
CONVERTER DAMAGE
Cold running of your engine requires enrichment whether fuel injected
or carburettor. Enrichment results in unburnt fuel leaving the cylinder
which becomes trapped in the catalytic converter where it causes significant
damage. Owners who do frequent short runs (e.g. to work, shops or
school run) can damage the catalytic converter within as little as
18 months! With the M.O.T. test requiring replacement at anything
from £350 to £1,000 cold starting can prove costly! |
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VISCOUS
CLUTCH FANS CONSUME NEARLY AS MUCH FUEL/POWER AS FIXED BELT-DRIVEN
FANS
The viscous fan was not designed for economy or power saving but to
provide greater low speed cooling without prohibitive power consumption
at maximum revs. Cars using speed controlled viscous clutch fans absorb
approximately the same power to drive the fan as a typical fixed-drive,
belt-driven fan because they are larger and only slip significantly
at top gear speeds well above 70 m.p.h. Temperature biased viscous
clutch fans engage drive when the engine thermostat opens and allows
heat to be dispersed by the radiator. Except in the unlikely event
of the engine thermostat shutting, it becomes a continually driven
fan for the rest of the journey making its removal essential to avoid
unnecessary power loss. |
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