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I haven't found any simple options for a cold
air intake with the Moss supercharger. I considered a hood
scoop or louvers until this idea came about. The air filter is
against the firewall with little clearance for an intake tube.
It is also heated by the exhaust manifold so the Moss heat
shield will find a home under there after this is done. I've seen pictures
of intake pipe routed behind the engine to the right front side
through the radiator shroud. Also the pedal box could be cut
for clearance but I decided to try a more direct
route. Below are some unfinished construction pictures. |
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Using the supplied air filter plate, a
plenum was fabricated to deliver cold air through a 3.5"
aluminum pipe and a K+N RF-1045 air filter mounted forward
of the radiator shroud. The external
profile dimensions of the old air filter were replicated
forming a half cone and a trapezoid
shaped duct was attached with a 3.5" flange on the front side. The
original air filter cap is used to hold the assembly in place
and a bolt was installed through the filter base plate to
secure the plenum. |
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The idea was to use all the area
possible between the choke and throttle cables and to clear
the pedal box. The original cable mounting bracket is still
going to be used. The pedal box will not be cut. |
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A notch is cut to clear the wheel well
and provide as much length as possible so the 3.5" pipe will
clear the supercharger on the way through the radiator shroud. |
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The center of the cone was a bit tricky
but It looks like it will be strong enough to hold to the
original mounting bolt and cap nut. The center needed a small
bashing to allow the mounting bracket to seat properly against
the fold- oh well who will know...The new mounting bolt (in
the middle) serves to lock the assembly and prevent slipping. An external brace will probably be
needed to support the supply tube which will have 2 silicone
hump couplings to allow for engine movement and vibration.
Another radiator shroud was purchased on Ebay to assuage any
guilt about cutting into my classic MGB. |
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The 3.5" aluminum pipe set in place to
check the fit. The shroud is cut for the pipe. The filter and
couplers have not yet arrived. |
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The clearance between the plenum and
pedal box makes this installation a challenge.
The plenum and pipes
were covered with Dynamat insulation. |
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The pipes, couplings and filter
installed. The K&N filter RF-1045 is a huge improvement over
the original. A partition was installed between the radiator
and air filter. A Moss heat shield and possibly a
header wrap will probably end up in the bay soon.
It's time to experiment with timing
advance now that intake temperature is lower. Easy does it... |
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There's not much space leftover but the
3.5 in pipe is a perfect fit. The hump couplers absorb most of
the vibration and engine movement.
Horsepower is not the primary concern in
this endeavor. This basically stock three main will probably never have
to respond to a wide open throttle. She's an old girl now and
she deserves some respect. The main objective is to
reduce the chance of detonation and the engine damage that it
can cause. The effect is to save horsepower by maintaining a
more dense air supply in extreme situations climbing hills and
crawling around town in hot weather. |
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Sources:
3.5" aluminum tube and flanges:
http://store.airflo.com/index.html
K+N air filter:
K&N High
Performance Air Filters, Oil Filters, & Cold Air Intakes -
Official K&N Engineering Site
spot welder: Harbor
Freight Tools - Quality Tools at the Lowest Prices
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