07-22-2014, 07:18 PM
Inboard ski boats use FAE (Fresh Air Exhast) pipes. This is simply taking the exhaust and putting it into the water about 1 foot below to muffle the exhaust and sequester the CO.
Also, sound insulation is a must. Just remember, you are dealing with low frequency vibration (below 1000 hz) and thus the engineering should be based on absorption, not deflection(reactive). Absorption silencers would be very time consuming and expensive, and in the end you'll still need sound deadening material. So if you want down and dirty with best results. Buy exhaust blankets and FAE pipes. FreshairExhaust.com will make what you need. Our 6.0 inboard tige is so damn quiet you don't know the engines running....and this makes everybody happy. Wish I could post pictures???? Rorell.
http://www.freshairexhaust.com/
http://www.silex.com/pdfs/Exhaust%20Silencers.pdf
Also, sound insulation is a must. Just remember, you are dealing with low frequency vibration (below 1000 hz) and thus the engineering should be based on absorption, not deflection(reactive). Absorption silencers would be very time consuming and expensive, and in the end you'll still need sound deadening material. So if you want down and dirty with best results. Buy exhaust blankets and FAE pipes. FreshairExhaust.com will make what you need. Our 6.0 inboard tige is so damn quiet you don't know the engines running....and this makes everybody happy. Wish I could post pictures???? Rorell.
http://www.freshairexhaust.com/
http://www.silex.com/pdfs/Exhaust%20Silencers.pdf
