Sound Deadener

[Mark42]

Anyone added (more) sound deadener to the inside of the engine cowl? The 40hp has a 1/2" layer of light weight foam. I'm looking to replace that with something more substantial. Thinking of the sound deadener used in those Boom Boom stereo cars. <br /><br />The 40hp cowl has the air inlet on the back side and as long as that inlet is not blocked I don't see any issue with heat or air starvation.<br /><br />I would like the motor to be quieter. It does have the carb sound baffle in place. <br /><br />Anyone tried this?

 

[umblecumbuz]

Re: Sound Deadener

One of the principles of sound deadening is to use mass. In other words, the standard foam deadens a bit, but it's not as effective as, say, heavy thick felt, or lead.<br /><br />Problem with felt of course is either the fire risk or water absorption. Lead adds too much weight.<br /><br />There is an extreme sound-proofing specialist who makes a stuff called leadfoam, which can be used in boats. Their website is: www.extremesoundproofing.com<br /><br />Or, what about those car sound deadening kits that were on the market? They have self-adhesive felt, fire retardant, lead-lined. Haven't seen them around for years.