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i saw a shark in albuquerque at the junk yard where they had used expanding foam in ALL the empty areas of the car to stop rattles for the ghetto stereo it had once had in it.
i saw a shark in albuquerque at the junk yard where they had used expanding foam in ALL the empty areas of the car to stop rattles for the ghetto stereo it had once had in it.
Ouch. If you fill all the nooks and crannies with that stuff, how much weight do you add?
Ouch. If you fill all the nooks and crannies with that stuff, how much weight do you add?
Easy answer -- how many 16oz cans of foam did you use? Multiply by 16 to get number of ounces, then divide by 16 to get the number of cans. Then weigh a full can and an empty can to determine how much the contents weigh. Multiply that by the number of cans you emptied, and you should have a good number.
In many cars including later 928's, foam is added to the B-pillars at the factory to reduce noise channeled through the body to the cabin. Since the B-pillars 'drain' directly into the rear wheelhouses, it's easy to replicate the factory effort on pre-GTS cars with a can of NON-EXPANDING spray foam. I strongly recommend that you 'blow' the end of a plastic trash bag up into the cavity from below,maybe with the outlet of a vacuum cleaner. Spritz the inside of the bag with water (causes the foam to harden). Then fill the bag with foam, extension tube up inside the bag to the top, drawing the foam tube and nozzle out as you fill. Leave the bottom of the bag open as it sets up. The bag keeps the foam from going everywhere (as the OP shares in his pictures). After the foam has set up for a day or three, you can go back with an electric carving knife to sculpt the bottom extremeties so the wheelwell liners can go back in. You'll want to protect fittings and tabs from the foam, which the bag will do with some planning and masking tape.
Alternatively, a few ziplocks with shredded upholstery foam or carpet padding can be squeezed to remove air, then stuffed up into the cavity, with the bag opening facing down. Once in place, un-zip the bag slightly to let air back in, and the foam in the bag will expand to seal up the cavity. Reseal the bag, repeat with more foam chips and bags until the cavities are full. Very easy to undo, bags keep the foam dry so no rust or mildew concerns with wet foam.
05-21-2015, 12:22 AM
How not to insulate your roof
