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Jon and V Boat Conversions & Modifications
JetJon Conversion - SeaDoo SP into 1236 Fisher
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<blockquote data-quote="sams" data-source="post: 294864" data-attributes="member: 6533"><p>Nice job on the conversion. I have been wanting to do one of these for a while and its always great to see threads like this.</p><p></p><p>I would recomend against using the egg crate foam at all. As someone who quiets boats for a living I consider myself somehwat fo an expert on the subject. With a small gas engine you will get decent reduction from an absorption material such as egg crate foam , however even better foam formulation such as polyethers will break down rather rapidly when they live in a hot, moist area such as an engine room. A foam faced with a thin aluminized vapor barrier facing will provide similiar acoustic performance and last much longer. Using a seam tape similiar to the facing to seal the edges before installing will give you teh cleanest and most long lasting installation. </p><p></p><p>If you want it really quiet and can tolerate some weight you can use a barrier conmposite. This will be a composite of 2 layers of foam with a barrier (usually mass loaded vinyl) in the middle. This material is manufactured by a number of companies and I belive that McMaster has such a product in their catalog.</p><p></p><p>The vinyl skirt around the exhaust is certainly a good idea. You could get into different muffler options as well, however, this is probably space and time prohibitive.</p><p></p><p>sam</p></blockquote><p></p>
[QUOTE="sams, post: 294864, member: 6533"] Nice job on the conversion. I have been wanting to do one of these for a while and its always great to see threads like this. I would recomend against using the egg crate foam at all. As someone who quiets boats for a living I consider myself somehwat fo an expert on the subject. With a small gas engine you will get decent reduction from an absorption material such as egg crate foam , however even better foam formulation such as polyethers will break down rather rapidly when they live in a hot, moist area such as an engine room. A foam faced with a thin aluminized vapor barrier facing will provide similiar acoustic performance and last much longer. Using a seam tape similiar to the facing to seal the edges before installing will give you teh cleanest and most long lasting installation. If you want it really quiet and can tolerate some weight you can use a barrier conmposite. This will be a composite of 2 layers of foam with a barrier (usually mass loaded vinyl) in the middle. This material is manufactured by a number of companies and I belive that McMaster has such a product in their catalog. The vinyl skirt around the exhaust is certainly a good idea. You could get into different muffler options as well, however, this is probably space and time prohibitive. sam [/QUOTE]
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Jon and V Boat Conversions & Modifications
JetJon Conversion - SeaDoo SP into 1236 Fisher
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