Build a lift muffler

[donald roth]

I’ve got a big in-line wet muffler, about 12” diameter and easily 36” long, 5” in and out.  My take on it is that it’s so roomy inside that it does little to reduce sound level.

I’m wondering about the feasibility of converting it to a lift muffler in hopes of making the exhaust quieter, adding a starboard side exhaust for North Sea style outlets.  <br />What I don’t know is if there are certain specifications that I need to follow in building it, such as how far off the bottom the outlet pipe should be?  Should the exhaust inlet be angled to create swirl ?  Is the muffler even big enough to do this?

Single 6BT with 5” exhaust, Seafirst pump, moves a lot of water.

Thanks!

 

Topic

[donald roth]

Please excuse my ignorance of terminology, is 3”x 3 or 3.5” mean that the exit tube is 3 or 3.5” off the bottom of the muffler?     Also, I notice that all the commercial lift mufflers are quite short (vertically) , would making it taller make it quieter?  I found this drawing online that is just  what I want to replicate.

 

 

[Tony Athens]

We have made quite a few in-line lift mufflers over the years.

All work great and do a better than great job as to silencing.

A few base construction pics of a current one we just finished. 6CTA 450

When done to our specs, they look 100% factory, only fit better as each one is made-angled, etc to fit.

Not just “adapt”.

12″ is more than adequate in Dia.

5″ in and 5″ out with 3 x 3″ or 3.5″ lifts.

You need to be a competent/experienced glasser and use the right materials

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donald roth

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