Bbc quiet exhaust question

A discussion on ways to reduce it.
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Shippee123
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Bbc quiet exhaust question

Postby Shippee123 » Sun Jan 03, 2016 5:58 pm

I tried searching with no luck . A few years ago there was a thread about quiet exhaust setups . I am building a bbc that is basically stock . I am wanting to have the exhaust as quiet as possible , I am curious about the dual in dual out mufflers versus the dual in 1 out . I will be running long tube headers and flex couplings and pipe to help . I am already hard of hearing and plan on doing a lot of idling ( gigging)so i would like to keep it as quiet as possible. Any help is appreciated.
11'6"x7' Royal craft with a 0300a Continental swinging a 74"two blade Super Snapper

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kwanjangnihm
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Re: Bbc quiet exhaust question

Postby kwanjangnihm » Sun Jan 03, 2016 7:02 pm

" I don't care who you are back in the world, you give away our position one more time, I'll bleed ya, real quiet. Leave ya here. Got that? "

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pipedog
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Re: Bbc quiet exhaust question

Postby pipedog » Sun Jan 03, 2016 7:22 pm

Image
try a two- into-one exhaust system, I put one on my caddy. The motor was quiet
as a church mouse.
Palm Beach open hull 13'9" with 6.0 F.I. LS - Ox Box and a 3bld "R"

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Shippee123
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Re: Bbc quiet exhaust question

Postby Shippee123 » Sun Jan 03, 2016 7:55 pm

kwanjangnihm wrote:try these threads to get you going!

viewtopic.php?f=23&t=1121&hilit=cntry141iq+quietest+boat

viewtopic.php?f=23&t=1965



Thanks that was the post I was looking for .
11'6"x7' Royal craft with a 0300a Continental swinging a 74"two blade Super Snapper

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pontoon outlaw
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Re: Bbc quiet exhaust question

Postby pontoon outlaw » Sun Jan 03, 2016 9:31 pm

:cheers: I run Borja circle track mufflers on my Cad 507 and everybody says it's the quietest boat on the river :scratch: they def cut down on the noise without sacrificing power

Olf Art
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Re: Bbc quiet exh<script id=

Postby Olf Art » Sun Jan 03, 2016 11:10 pm

Shippee, space is usually a little limited on an airboat, but a great way to both build torque and quiet an engine is to use a dual in-dual out muffler as a crossover. In a crossover the exhaust pulses from each bank tend to cancel each other for sound, but build torque at the same time. Every Nascar race car has a crossover under it because they make tuning cleaner, and they build power.

Remember that big mufflers make power because they have the internal volume to handle the exhaust gasses ...... little ones tend to be pretty restrictive, so don't be afraid to 'get quiet'. It'll actually make power, done right. Good luck with your build! :thumbleft:
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SWAMPHUNTER45
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Re: Bbc quiet exhaust question

Postby SWAMPHUNTER45 » Mon Jan 04, 2016 6:21 am

Thru hulls with two big stainless turbo mufflers works great. Staggered 3 inch inlets is what we use.


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