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What do the mid-70's mufflers look like inside? |
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robdubbleu 
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Joined: December-26-2016 Location: Mt. Island Lake Status: Offline Points: 120 |
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 Topic: What do the mid-70's mufflers look like inside?Posted: May-12-2022 at 12:48pm |
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Hey guys, what do the insides of the mid-70's muffler/silencers look like? Mine are just hollow fiberglass tubes. I'm not sure if that's normal or not. My boat is LOUD. Don't get me wrong, I love the V8 sound. But the sound level (especially for passengers at the back of the boat) is a little too loud. I'm thinking about putting some dynamat or something inside the engine cover but I figured I'd see if maybe there's something wrong with my mufflers.
Thanks!
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1976 Ski Nautique (PCM 351) - Currently under major renovation: floor, carpet, interior, gel coat, engine overhaul - ALMOST DONE!
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: May-12-2022 at 3:41pm |
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This is a typical Centrex muffler like used on these. Basically as you look into either end it's like your looking down into a glass. The part that is cut out as you see here,is placed down to let the water drain out when shut off
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robdubbleu
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Joined: December-26-2016 Location: Mt. Island Lake Status: Offline Points: 120 |
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Posted: May-13-2022 at 1:32pm |
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Ok if that holds true for my mufflers, they were either modified by a previous owner or blown out and gutted themselves over time. This thing sounds good but it's noisy...
Anybody know of any good condition ones for sale? I need 2...
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1976 Ski Nautique (PCM 351) - Currently under major renovation: floor, carpet, interior, gel coat, engine overhaul - ALMOST DONE!
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11269 |
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Posted: May-13-2022 at 8:46pm |
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I don't think any 76's had mufflers from the factory, just straight copper tubes, so I'd guess somebody put in fiberglass tubes for some reason.
I guess the gods of noisy pipes haven't noticed your thread or they'd be yelling at you
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swilliams
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Joined: June-26-2016 Location: Cincinnati,Ohio Status: Offline Points: 237 |
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Posted: May-13-2022 at 10:15pm |
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Love my loud pipes!
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1976 Martinique,350 Omc. 1975 Glastron/Carlson CV16,115 Merc.
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robdubbleu
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Joined: December-26-2016 Location: Mt. Island Lake Status: Offline Points: 120 |
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Posted: May-13-2022 at 11:39pm |
Haha yeah I know it's a controversial thing to say. And it's not too loud for me in the driver's seat, but no rear-seat passenger can hear anything at all while cruising. Buuuuut I'll probably just keep it that way
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1976 Ski Nautique (PCM 351) - Currently under major renovation: floor, carpet, interior, gel coat, engine overhaul - ALMOST DONE!
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NeilMcG
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Joined: September-20-2021 Location: Pittsburgh, PA Status: Offline Points: 230 |
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Posted: April-22-2023 at 8:53pm |
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My centak silencers have alligator cracks throughout the inside. Is that normal wear and tear or a sign of imminent failure? The outsides are fine.
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KENO wrote: