stainless steel exhaust

[Dromo]

I read some threads on making a new exhaust by piecing together galvanized iron pipe and elbows etc.. Seems like a lot of work
Couldn't I just take the old section of exhaust pipe, to a muffler/exhaust shop and get them to bend me up a one-piece section , out of stainless steel exhaust pipe, or will this not work in a marine application?
Any comments,helpful advice,or other suggestions most welcome
Thanks: Rick

[msauntry]

Only part they might have trouble with is the flange mounting, but if they have a solution then I can't think of a reason why it wouldn't be an option.

[Dave Neptune]

Dromo, the SS exhaust sounds good but maybe expensive and possibly difficult to get int the same holes as the radii of the bends will be drastically different. The flanges are a standard and they should have no problem matching it up with the A-4. You can also purchase the same pipe fittings in stainless and accomplish the same thing and the same curves to make instalation a lot easier. I was going to do same a few "exhausts ago" and decided against it because of the cost. I get between 6-8 years out of mine before the back preassure creates a noticable drop in performance.

Dave Neptune

[sastanley]

dromo...it was a bit of an adventure!!! . My total cost (obviously labor not included) was about $60 (not including Moyer's flange, however I recommend it)
- The most expensive was the heat wrap, about $40 of that cost!

I would highly recommend the flange as it eliminates a few extra galvanized parts. My old flange was likely an original part and was pretty weak. It was basically the flange with a short pipe nipple welded (male thread) on it. The "street el" (bottom left most part) in the second picture screws right into the Moyer flange.

I found everything at my local Lowe's, once I knew what I was looking for. As you'll see below, I had some black pipe mixed in I bought from another hardware store..that got me rolling, then I was on the hunt for equivalent galvanized.
Sorry for the bad initial picture, I had some old hoses & tape hanging around in the engine 'room'.

What I personally did is this:

Figured out which elbows & fittings I needed at the ends. Then I bought a couple different lengths of pipe nipples for testing. I wanted to get my loop as tall as I could without hitting the cabinet above. When I was done I simply returned the unused parts. The heat wrap has been removed in the first pic. I used No. 2 Permatex to seal the threads during final assembly, although Don's "Aviation" brand would likely work just as well..they have similar performance characteristics , except the No. 2 is in a tube and a little less 'runny'.

The bronze mixer piece was re-used..I just cleaned it up on a wire wheel..it is similar to the one Don Moyer sells. I was able to get just a little more clearance between the muffler & bronze mixer after final assembly, so that the piece of rubber hose is the same length as original, about 6" long.


Here is a before, in the middle & after picture. The fourth pic is the engine in almost running order, however, the exhaust is complete. I think in this pic I was still waiting for a couple of hose barbs to show up so I could upsize my intake hose to 5/8", and I have not installed the cabinet or a permanent anti-siphon loop yet, & nevermind things like the loose alternator belt