Chaotic River Posted May 31, 2017 Report Share Posted May 31, 2017 I need to replace the exhaust on my boat, the engine is a Lister SR2, outlet pipe is 1¼", the pipe on the roof of the boat is 1½". She is currently fitted with a 1¼ silencer. My question is, would I get any benefit from fitting 1½" silencer, of should I stick to the original size. I know that on high performance engines the exhaust design makes a significant difference, but on a slow revving diesel?? Link to comment Share on other sites More sharing options...
WotEver Posted May 31, 2017 Report Share Posted May 31, 2017 My understanding of Listers (and other similar unstressed engines) is that the silencer has little if any effect on power production. Link to comment Share on other sites More sharing options...
cuthound Posted May 31, 2017 Report Share Posted May 31, 2017 If the exhaust system causes too much backpressure it will result in power loss from a diesel engine. However given the short runs and few bends on a typical narrowboat exhaust, this will be a non-issue. Link to comment Share on other sites More sharing options...
Cheshire cat Posted May 31, 2017 Report Share Posted May 31, 2017 That's what you call patina! Link to comment Share on other sites More sharing options...
Catnip King Posted June 1, 2017 Report Share Posted June 1, 2017 Is there any harm in removing the silencer? I worry the inside of ours is getting coked up so a more simple exhaust would be better for us to clean it. Noise doesn't bother me... sort of hijacking your thread a little here sorry. Link to comment Share on other sites More sharing options...
WotEver Posted June 1, 2017 Report Share Posted June 1, 2017 38 minutes ago, Catnip King said: Is there any harm in removing the silencer? Only to your (and everyone else's) ears... Link to comment Share on other sites More sharing options...
Cheshire cat Posted June 1, 2017 Report Share Posted June 1, 2017 Having no silencer would be seriously antisocial and probably deaf after the first long tunnel you pass through. Link to comment Share on other sites More sharing options...
Chaotic River Posted June 1, 2017 Author Report Share Posted June 1, 2017 Thanks for the replies, I have ordered a 1¼" silencer. 5 hours ago, Catnip King said: Is there any harm in removing the silencer? I worry the inside of ours is getting coked up so a more simple exhaust would be better for us to clean it. Noise doesn't bother me... sort of hijacking your thread a little here sorry. Having heard the noise from engines without silencers, I would not recommend it on the canal. I am hopeful that replacing the whole exhaust system on my boat will reduce the noise level. Her indoors has started calling the engine "bam bam".... Link to comment Share on other sites More sharing options...
Catnip King Posted June 1, 2017 Report Share Posted June 1, 2017 4 minutes ago, Chaotic River said: Thanks for the replies, I have ordered a 1¼" silencer. Having heard the noise from engines without silencers, I would not recommend it on the canal. I am hopeful that replacing the whole exhaust system on my boat will reduce the noise level. Her indoors has started calling the engine "bam bam".... lol I would rather bam bam than old smokey as mine refers to it Link to comment Share on other sites More sharing options...
Chaotic River Posted June 1, 2017 Author Report Share Posted June 1, 2017 15 minutes ago, Catnip King said: lol I would rather bam bam than old smokey as mine refers to it Not sure you would agree if you heard it, on tick over it's a nice sound, but when I open the throttle it's like an orchestra of blacksmiths tuning up... Link to comment Share on other sites More sharing options...
WotEver Posted June 1, 2017 Report Share Posted June 1, 2017 26 minutes ago, Chaotic River said: Not sure you would agree if you heard it, on tick over it's a nice sound, but when I open the throttle it's like an orchestra of blacksmiths tuning up... Don't open it up sorted! Link to comment Share on other sites More sharing options...
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