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Installing an
EFI 5.0 in an early model Mustang doesn't mandate
moving the battery, but doing so provides the space
necessary for a better fit for the air filter.
Original installation of the air filter (shown below)
left the K&N sitting in the battery's "space", but
was subject to the hot air from the headers,
alternator, and radiator. A 'cold air' solution
was desired. The fabricated box shown on the
left protects the air filter from engine bay
temperatures. |
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Air Source: |
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an area that can be opened up to provide fresh air to
the filter. The area opened up was approx 5x7
with a steel mesh installed to stop any debris. This is an example of 'what seemed like a good idea at the time'. The opening shown provided a tremendous amount of cold air to the air filter, (which was good), but it also pressurized the air filter and became more of a 'forced air induction' (which was bad) situation. The pressurized air intake did not work well with the EFI system. Above 30mph, the system pushed more air into the system than it was designed to take. The motor backfired and would not run smoothly at any throttle position. A change had to be made.
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Air Box: |
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To correct the
situation, the opening had to be redesigned to allow
cool air in but not pressurize the compartment.
To accomplish this, I installed a 'baffle'... essentially a block off plate to the opening that covered approx. 75% of the direct flow. The plate (not shown) mirrors the opening size but stands approx 1/4" back from the opening, block the flow but allowing fresh air into the box. This baffle solved the over pressurization and backfiring issue. The box is fabricated out of aluminum, folded and pop riveted into shape. It is attached to the side wall (shown bolt) and to the front core support behind the vent frame. Underneath, a small drain tube acts as a support over the battery shelf. |
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A bracket was fabricated to 1)
hard mount the MAS unit, and 2) support the air
filter. This bracket removes all vibration from the
system. the air box does not come in contact
with the air filter. The stock 1992 air snorkel is used in this installation. To create the bends to move the air filter into alignment, there are two PVC 90 degree pipe fittings assembled and aligned to establish the proper position. |
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