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Offline chads454

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Newbie here,  I have read a lot of posts and it seems everyone likes pics so here's a couple from my first run at a new muffler for the wife's 03' , what do you think?

Offline Painlesstom

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #1 on: June 14, 2018, 07:48:20 PM »
It looks pretty, but it also looks pretty heavy to have no support. Given time the header will crack and you will end up melting something in a rather dramatic way. I would suggest a few support braces from the engine to mid point of the main body.  \./8
Tom

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Offline chads454

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #2 on: June 14, 2018, 08:33:58 PM »
Thanks Tom. yeah it's a work-in-progress those are just the first rough pictures it's only tacked together.  I just need to do something because the hood is starting to melt a little bit and getting cracks from all the heat other muffler  because it's it's so low in the compartment.

Offline Painlesstom

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #3 on: June 14, 2018, 08:45:36 PM »
Very good then, look forward to seeing how it all comes together.  \./8
Tom

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Offline mokamo

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #4 on: June 15, 2018, 06:12:15 AM »
Hopefully Tom would change his mind and decide to build a muffler for Honda. i think it will not only improve the noise but will also reduce heat in the engine compartment.

Offline Painlesstom

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #5 on: June 15, 2018, 07:08:22 AM »
I don't use the Honda, and most people opt to get away from it and convert to Subaru. Mufflers for the Honda will remain a DIY project.  ;)
Tom

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Offline mokamo

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #6 on: June 15, 2018, 09:18:11 AM »
Chad,

Youre the inly iption i have now  ;)
Nice if you can document the steps and materials to buy and where. The welding part can be done by the Muffler shop..

Looking forward for details...

Anyone else with easy to follow DIY muffler?

Larry,
You're my other option for honda muffler.

Thanks
« Last Edit: June 15, 2018, 09:20:31 AM by mokamo »

Offline chads454

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #7 on: June 15, 2018, 09:38:13 AM »
yeah I'll prove it first and get back with details.

Offline Larry

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #8 on: June 15, 2018, 10:12:35 AM »
Chad,

Youre the inly iption i have now  ;)
Nice if you can document the steps and materials to buy and where. The welding part can be done by the Muffler shop..

Looking forward for details...

Anyone else with easy to follow DIY muffler?

Larry,
You're my other option for honda muffler.

Thanks
I still have it you are interested.
« Last Edit: June 15, 2018, 12:41:53 PM by Painlesstom »

Offline bizler

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #9 on: June 15, 2018, 12:36:20 PM »
Hopefully Tom would change his mind and decide to build a muffler for Honda. i think it will not only improve the noise but will also reduce heat in the engine compartment.

I have a DIY muffler on my Mokai that may spur some ideas on building and mounting a muffler on a Honda.  Mine is made from an oxygen bottle.  It utilizes the stock brace plus a secondarily strut.

The main reason I chose to DIY was to avoid having to cut a large hole in the hood.  I have had this on my boat for several years now and it hasn’t given me any problems. 

I did later add a secondary vent in the hood to increase the ventilation.

Offline mokamo

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #10 on: June 15, 2018, 07:23:32 PM »
Thanks for the pictures Bizler.

So its an oxygen bottle with nothing added inside. You welded an adapter to connect it to engine and added a coil wrap around the bottle with water intake at the bottom. Simple to build. Did it improve the sound? and no more hot temp inside compartment? what other positive changes from that simple muffler. Where can i get empty oxygen tank like that?

Offline bizler

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #11 on: June 15, 2018, 07:57:46 PM »
There are a series of 9 baffles inside. They are perforated disks spaced about 5/8” on a 1/4-20 all-thread rod which is welded at the top and at a crossbar at the bottom.  Wanted to make sure nothing would come loose and drop into the valve chamber.  I think I posted some photos of the disks on this site previously. They each have a little more open area than the 7/8” dia. inlet from the head.

So far as empty oxygen cylinders, I use 3 or 4, along with Mapp gas in order to braze and weld one of these together.  The cylinders cost about $10 each when full at Lowe’s.

I use about 18’ of 1/4” copper tubing to wrap the cylinder.

Here is a template for the baffles I built.

Bill

Offline chads454

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #12 on: June 15, 2018, 08:05:30 PM »
Ok all done, put a brace on the bottom and one off my handle I use to remove the engine.

Offline Painlesstom

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #13 on: June 15, 2018, 08:50:38 PM »
Beautiful work. Just keep a close eye on the joints, I can still see how cracks could develop with so little surface area where they attach. How thick is the main body?
Tom

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Offline bizler

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Re: 1st Run at making a stainless exhaust for my Honda powered Mok
« Reply #14 on: June 15, 2018, 09:09:38 PM »
Ok all done, put a brace on the bottom and one off my handle I use to remove the engine.

Would love to have your welding skills, Chad. Looks very nice.  Wrap it with some header tape and S. S. bands to keep it from melting things around it.  Keep your fingers crossed that it never breaks off and lands in the boat.   ;)