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Mufflers or No Mufflers
Posted: Oct 7th, '09, 11:07
by Harry Woods
When I did my Yanmar 4LH repower I left the mufflers in place. I now need to replace one and remember a post a few years back suggesting that they be eliminated for this application. Please provide to pros and cons on what others have done. Also, if exhaust noise significently increased without them. Thanks.
Harry
Posted: Oct 7th, '09, 11:27
by mike ohlstein
None needed. Diesels make more noise on the intake side of the engine.
My un-muffled 4LH's are quieter than my muffled 454's were. The only advantage is the back surge protection.
I may still have my old 4" mufflers up in the attic. Let my know if you need one. I could bring it out there on Sunday.
Posted: Oct 7th, '09, 11:45
by Harry Woods
Mike,
I think it was your post that I saw on the subject. I have surge tubes on the exhaust system and back flow is not a concern. It may be easier to cut them out of the system. Thanks for the offer for the muffler. I will talk with the yard when I put it on the hill. I just got back from the inlet a few minutes ago. The wind is cranking at 30 plus. The tide at 9:00 AM was almost over the docks with flooding on Dune Road. Let's hope the wind subsides before the evening highs.
Harry
Posted: Oct 7th, '09, 13:50
by randall
it is howling out here. whitecaps in the little end of 3 mile harbor. i was checkin the lines when round the buoy comes some guy in a little outboard. i'm talking gusts to 40 easy. guy has some hair.
Posted: Oct 7th, '09, 14:10
by mike ohlstein
