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Home > Engine
> Induction
Induction
 The
induction system is specifically configured for high rpm, Mustang 5.0
liter drag racing applications. It consists of a home-made ram-air system
that feeds air through a K&N air filter to a Pro-M
87 mm mass air sensor and then to a Hogan's upper intake manifold that
is mounted on
an Edelbrock Victor
5.0 lower intake manifold. This system is capable of flowing tremendous
amounts of air-especially for a fuel injected setup. This
combination is specifically for use on engines that operate above 7,000
rpm and is probably not appropriate for 99% of street type engines.
Each component of the induction system is discussed in detail below.
For more information on building high performance engines, check out the
books
available at the SlowGT store.
  Ram
Air: The Ram-air system was designed and
fabricated by Mike. The primary air inlet is through the passenger
side hole in the ground effects originally for the fog light. The
air is ducted from this point to the air/filter box using 6" ID air
hose. The inlet path is made as straight and bend-free as
possible. A special bracket is used to attach the inlet hose to a
heavily modified March air box on the inside of the fender. The
car has been tested both with and without the ram air system connected.
The primary benefit appears to be the supply of cool outside air as
opposed to hot under-hood air. There does not appear to be a
significant advantage for the ram effect. After many iterations,
this configuration appears to be optimum.
[ Top of Page ]
 Air
Box: The 6" ID hose terminates at
the March air box mounted to the inner fender. The air box is
large enough to fit the large K&N filters required for breathing.
This box appears to be the best for the job available today. Both
the inlet and outlet side holes in the air box have been greatly
enlarged for maximum air flow. The inlet hole in the air box was
enlarged to match the existing hole in the inner fender from the
factory. This hole perfectly accommodates the 6" air hose
when it is compressed. The outlet hole in the air box was enlarged
to approximately 6.5" to allow the K&N filter to fit through.
[ Top of Page ]
 Air
Filter: Air filtration is very
important for the long-term health of the engine. With the expense
involved in building an engine of this caliber, we don't think it is
wise to run an engine without filtration. Tests on SlowGT
indicate that there is no measurable performance difference between
running with the big K&N and running with no filter at all.
One disadvantage to running without an air filter is that the mass air
sensor signal becomes very noisy. Although this isn't measured as
detrimental to performance, it probably is not good. The filter in
SlowGT is a K&N model that is
delivered with the 83 mm Pro-M mass air meter. The air box had to
be modified to allow the filter to fit.
[ Top of Page ]
   Mass
Air Meter & Ducting: The mass air
meter is an 83 mm Pro-M unit from Best Products and replaces a 75 mm
Bullet unit previously on the car. The car picked up almost a
tenth by changing to the larger mass air. We originally did not
believe that the very precise calibration of the Pro-M was necessary,
however, during tuning and testing, this information has become
invaluable. The Pro-M sensor is a very high quality unit.
Mike fabricated the ducting tube (between the mass air sensor and
throttle body) out of mandrel bent 3" tubing. This was done
because it just didn't seem right to put a puny tube connecting the
large sensor to the large throttle-body. We don't know if it makes
a big difference, but it's cheap insurance to make sure it's not a
limiting factor.
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   Upper
Intake: The upper intake manifold
is a high flow Hogan's unit that features a tapered plenum and angled
intake runners that match the intake angle of the Victor 5.0 lower
intake. This unit is the first of it's kind and was made by
Hogan's specifically for Mike. Mass air sensor flow data indicates
that this Hogan's intake continues to flow freely above 7,000 rpm
compared to a heavily modified (welded and ported) GT-40 lower with
old-style Hogan's upper. The intake does not appear to be a
limiting factor in shifting the power band to more than 8,000 rpm.
We don't believe it's been fully utilized on this engine yet and expect
to see substantial improvements as soon as the 2000 season combination
is together. The intake uses a billet 75 mm throttle body made by
AccuFab. This is also a high quality unit that appears to flow
very well.
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   Lower
Intake: The lower intake manifold
is an Edelbrock
Victor 5.0 unit that has had the ports cleaned up by Charles Rogers at Heads
Up Performance in Lumberton, North Carolina. This intake is
very good in stock form and all that was required was to match the port
profiles to the heads. This intake is, without question, the
best lower intake available for high rpm (above 6,500 rpm) injected
engine combinations. If you plan to operate below 6,500 rpm, the
best lower intake appears to be a GT-40. The 0.5 inch ID fuel
rails visible in the picture are high flow units made by Central Coast
Mustang. The injectors are made by Lucas. The fuel system
will be covered in detail on a future expansion of the web site.
General Induction Information: The
induction system is assembled using the general guidelines below.
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All mating surfaces were checked to eliminate
disturbances in the flow path for incoming air.
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All components were tightened according to Ford
factory specs.
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All lower intake retaining bolts should be
coated with PST (pipe sealant with Teflon) to help prevent oil
leaks.
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The only induction component that has torque
specs in our book is the lower intake. The retaining bolts
should be tightened to 22 ft-lbs. The torque bolt pattern is
shown below.
[ Parent Page ]
[ Induction ] [ Short Block 2000 ] [ Exhaust ] [ Heads ] [ ValveTrain ]
[ Top of Page ]
 For more detailed
engine-building information, check out the analyses
and books
available at the SlowGT store.
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This web site is dedicated to 5.0 Liter Mustang Drag Racing.
The technical information on this site is provided based on the owners personal experience.
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All rights reserved. ASR Corporation 2000. http://www.slowgt.com
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Last Updated: May 22, 2001
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