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Engine basics => Engine set up tips => Topic started by: Dennis Toth on April 21, 2018, 10:44:19 AM
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Guys,
I need a recommendation on material for a metal muffler to case that will seal yet allow some cushioning so as to not be to tight to distort the case. I have tried some thin aluminum but that needed really cranking down on the bolts. I'd really like something a little softer. Any suggestions?
Best, DennisT
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I sort of asked the same question a wile back, the best answer was to not use a gasket since it will cause the muffler to vibrate lose. Best alternative answers were to file the engine exhaust flange flat and the muffler flange. Or use automotive high heat red gasket sealant.
Chris
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If one really must use a gasket, use sopme gasket material meant for the cylinders of motorcycle engines for base gaskets. It will crush a little bit and seal but may help prevent vibrating loose like soft metal will. Copper sheet will also work but offer the same issue as aluminum. filing the mating surfaces flat and sealing with hi temp sealant is the easiest way.
Type atyou later,
Dan McEntee
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I have always used liquid silicon gasket. Apply a thin coating, nip up hand tight, and tighten fully once it has set.
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I found some of the old Perfect gasket material (the green paper like stuff) that was still soft and just the right size for covering the exhaust area. I made up the gasket leaving a little extra material on the inside and outside edges (I know this may restrict the flow a little but not much). I was able to then mount the muffler carefully tighting it down with the glow plug removed checking that I didn't tighten one side to much and cause biding (Fox 35 thin case). I also added some blue lock tight on the bolt threads to prevent losening.
Best, DennisT
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Been using a gasket paper assortment I got from an auto parts store. For mufflers, the thinest, like card stock, works well. I set the muffler flange on the paper, glue it on with CA, then trim with a hobby knife. Nice and neat.
Norm