Our Lindy is a bit "flatulant" too. Some say she has "great port presence." I'd be interested in learning more about quieting down her 230HP Detroit 6-71N.

Bob - I, too, have a 6-71N. In my case in a 42' wooden lobster boat and with a dry stack exhaust exiting just over the top of the pilot house. I've put a very high quality SoundDown insulation installation into the engine room and the heavy lifting doors that open from the main cabin into it. In addition to the spiral muffler at the engine exhaust, I've added a secondary muffler in the pipe at the top of the pilothouse. My friends tell me it's quieter. I still think it sounds very loud. Too loud to have a normal conversation while underway is in my book too loud. However, I've done all I can and I live with it. Look at all the benefits of a 6-71. Great reliability, marvellous instantly available torque for close quarter maneuvering, cheap cheap replacement parts, universal serviceability by any shade tree mechanic, never rusts because of the oil spray (!), etc. I've got it, I live with it and I'm not about to change it. Tom At 02:27 PM 2/8/2001 -0500, Robert_Schreiber@lotus.com wrote: > I'd be interested in learning more about quieting down her >230HP Detroit 6-71N.

Our Lindy is a bit "flatulant" too. Some say she has "great port presence." I'd be interested in learning more about quieting down her 230HP Detroit 6-71N.>> Robert, we also have a 6-71N at 165 HP @1925. She's dry stacked and we are changing to what's called a "critical grade" silencer. It drops the sound level by ~ 30 db. The old system was 26 years young and had the "Detroit Rap". I have listed to several gensets with this level of sound attenuation and the mechanical noise of the engine is louder than the exhaust. The wife is looking forward to this "improvement".....a stealth Detroit!! Never :-) Dave & Nancy Swan Song Roughwater 58' Tortola, BVI