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Old 09-09-2019, 16:00   #16
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Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
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Re: How to find this exhaust riser?

Originally Posted by Cat36Mahalo View Post
Yup. Not galvanized.

Commonly called "black iron or steam pipe"-the least expensive form of steel pipe.
Works fine for 3+ yrs.
If you want longer service(10+ yrs),go with SS equivalent size pipe.

The DIY material cost is (estimated) $30-$50 black iron/steam or $80-$120 stainless

plus the "asbestos" (equivalant) lagging.

I can see it being an 8 hr +/- job

You have a "partial hot/dry & water cooled exhaust"-common in days gone by. & perfectly safe if the appropriate precautions are taken.

Obviously,if your boat has had no problems related to this exhaust setup,over it's lifetime-one cannot say it is "wrong".


My personal experience & humble opinions-feel free to ignore both
Remember-If all else fails, Google is your friend.
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Old 09-09-2019, 16:19   #17
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Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
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Re: How to find this exhaust riser?

Originally Posted by fatherchronica View Post
It will be cheaper than you think to have a metal fabrication shop build one of stainless steel. I would go to at least 3 places personally. I was a general building contractor and always got 3 bids, even if I was fairly sure the was a sub-contractor I thought I was going to use. I had had guys I knew and trusted their abilities get into debt or discover drugs over the years that thought I was not getting other bids and suddenly their prices would skyrocket. My other rule of thumb ( not the one my employee Bruno lost when he fell asleep one Monday morning on a table saw after a busy weekend in the happiest place on Earth, Tijuana, Mexico some years before he went to work for me) was that if the 3 bids varied by a lot, I would get a couple more. I once had an insulation contractor show up to bid an industrial building in a Ferrari. His bid was more than 10 times the cheapest bid and 4 times the middle bid. After getting 1 more bid 1/2 way between the cheapest 2 I went with the cheapest bid. The cheap guy told me me that he would bring to idiots to my job and a scissor lift and the insulation and that he would pick them up in the afternoon and make $1000 for his effort. He did and I made more than that as my initial bid was closer to the middle guy. Sorry I am old and live in a new to me town and don't too many friends yet.
Enjoyed your post & great advice for O.P.

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Old 09-09-2019, 17:26   #18
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Join Date: Jan 2016
Location: Ventura, California, USA
Boat: Catalina 30
Posts: 660
Re: How to find this exhaust riser?

Oops, I missed the M40 spec in the OP post, but it's still fairly easy to fabricate one using standard pipe, as discussed.
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Old 10-09-2019, 09:14   #19
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Join Date: Dec 2016
Location: Toronto On. Canada
Boat: Paceship Py 26 26.6
Posts: 21
Re: How to find this exhaust riser?

The water inlet looks to close to your exhaust connection,1/4/1/2 to the top.
This will not even allow a good clamp space,I would make the new one a inch longer
at the top if possible or have the water inlet 1/2 in lower. Just a thought.

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