Outboard "Muffler"

[79Merc80]

Hey guys:

I have designed and made a "Muffler" for outboard engines. It is made to be used while running the engine on the hose. It gives the engine the backpressure it gets while running in the water. Also, the engine is only as loud as is it in the water, which your neighbors will really appriciate. The backpressure is enough that you should be able to adjust the idle and then be able to drop it in the water and not have to re-adjust it. I have used it on Mercury, Evenrudes, and Johnson outboards, as long as they have thru hub exhaust.

NOT RECOMMENDED TO RUN IN GEAR ABOVE AN IDLE!!!!!!!!!

Here is a picutre of it. It's in-expensive and easy to make. Just 3 pieces from your local hardware store.

In my experience, there is no need to drill any holes in the PVC pipe to keep from building exsesive pressure, as water will flow around the back of the prop and exhaust relief ports do their job as if your engine was running in the lake/river/ocean.

Hope this helps. Craig

 

[nwcove]

Re: Outboard "Muffler"

nice little setup.....good work.

 

[5150abf]

Re: Outboard "Muffler"

Pretty slick, I normally just put an old towel on the prop and bungy it on, keeps the noise down and provides some back pressure but you made an actual tool, nice job.

 

[79Merc80]

Re: Outboard "Muffler"

Thanks guys. I'm going to try and take a video of it on.

 

[JB]

Re: Outboard "Muffler"

There has been an outboard muffler on the market for at least ten years, Merc. Like yours, it bolts onto the prop.

http://www.google.com/url?sa=t&sour...LcdsaVP9Q&sig2=ZWLvjabnMMoO2kPXmIfz9Q&cad=rja

 

[fishrdan]

Re: Outboard "Muffler"

Is that essentially, just a sealed rubber cap?

I've seen these at the hardware store, which would be less parts.

 

[nwcove]

Re: Outboard "Muffler"

thought others would jump in and give congrats on being inovative, but there ya go.

 

[79Merc80]

Re: Outboard "Muffler"

There has been an outboard muffler on the market for at least ten years, Merc. Like yours, it bolts onto the prop.

http://www.google.com/url?sa=t&sour...LcdsaVP9Q&sig2=ZWLvjabnMMoO2kPXmIfz9Q&cad=rja

JB:

I just looked at Overton's site and couldn't find anything. Do you know where it is? I'd like to see if it's close to mine.

Thanks

 

[fishrdan]

Re: Outboard "Muffler"

thought others would jump in and give congrats on being inovative, but there ya go.

Nothing against it being a good idea, it is a good idea. Though the Fernco cap would be simpler. With the Fernco cap you could cut some relief flaps in it, so at above idle they would open up a bit.

I need to do some work on my boat and going to give it a try if I can find a 5" cap easily.

 

[79Merc80]

Re: Outboard "Muffler"

Here is a video with the muffler on. Notice that water does indeed exit around the prop as well as above the prop and the exhaust relief ports are doing exactly what they are suppose to do. I hope this clears up any of the questions above.

Fist link is with and second is without.

http://www.youtube.com/watch?v=4uZanPW28a4

http://www.youtube.com/watch?v=vPKQ7rc24xE


Craig

 

[JB]

Re: Outboard "Muffler"

The company may have failed or Overton just doesn't offer them anymore, Merc. I do remember an online demo by someone that really reduced the noise. That was a long time ago and I don't remember when or where.

Don't feel bad. A good idea is still a good idea even if it has been thought of before. When I was racing Karts I "invented" a couple of modifications to my chainsaw engines only to find them on the market within weeks. At the time I thought someone had "stolen" my idea; now I just think two minds were working the same way.

 

[79Merc80]

Re: Outboard "Muffler"

That sucks. I would have liked to have seen that video. See if it's as good or better than mine is.

Thanks JB.

Craig

 

[laotou]

Re: Outboard "Muffler"

Great idea! I gonna build one.

 

[halfmoa]

Re: Outboard "Muffler"

Great idea! I gonna build one.

Me too! Just what I need! Thanks for the inspiration!

halfmoa

 

[79Merc80]

Re: Outboard "Muffler"

You're welcome guys and thanks.

Craig