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Matt Dralle's RV-8 Project
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Date: 10-25-2009
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Ignition Harness Pass-Through In Baffles - Part 1
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Traditional aircraft engines have two spark plugs per cylinder as well as two, independent ignition sources, typically magnetos. There is a spark plug on the top of the cylinder and another on the bottom. The left mag feeds the upper right spark plugs, and the right mag feeds the upper left spark plugs. Since these spark plugs are located in the baffled cooling chamber formed by the sheet metal and rubber baffles, the ignition harness has to pass though the rear baffle somehow, making sure that the wires cannot chaff or become shorted on the metal. I picked up these sweet, nylon 5mm wire seals from ACS, part number #376 (the old part number I have is #375). They come in two pieces and separate to allow you to stick the wires in between. I found that I had to drill them out to 9/32" to fit the M4001 Slick Ignition Harness wires, though.
I opted for a convenient place on the left and right side of the engine baffles and drilled a .75" initial hole for the Greenlee punch bolt. It turns out that a 1" conduit punch punches a 1.362" hole which is exactly the right side for the nylon wire seal. I added a couple of #8 platenuts to the aft side of the baffle and then assembled the whole thing with 2 #8 screws and washers.
Much to my dismay today, when I opened the Slick Ignition Harness box I found that the bright red wire color had been pre-chosen for me! Ugggg... Hopefully I can get the red set swapped out for a black set to better match my Black & Chrome motif under the hood... Go Raiders! (Ah, whatever...)
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Initial .75" Hole For Greenlee Punch Bolt
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Greenlee 1" Conduit Punch - Yields 1.362" Hole
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Greenlee 1" Conduit Punch - Yields 1.362" Hole
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Copyright © 2008-2024 Matt Dralle. All Rights Reserved.
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