[Alberg30] Exhaust Pipe

[Brian and Elaine Timmins]

   Since we're briefly touching the topic, was Whitby's exhaust the
bronze/copper standpipe design? I have this design and it appears original
(including a molded fiberglass cover for the output). It's in fine shape
still, but it came close to being trashed a few years ago when I changed my
manifold and exhaust flange. I've had problems with exhaust systems on other
A4 equipped boats in the past and I'm sort of amazed that this system might
have lasted since 1972.
   Has anyone taken one of these apart and drawn up it's design and how to
build one? It appears fairly simple from the outside, but I'm curious as to
the internal fittings, most especially the end of the actual exhaust pipe
inside the water jacket and the end of the water injection at the top. There
must be some magic there since I've cranked my engine for quite a while
without it starting and I've never had any water get down to the manifold or
the #4 cylinder. There must be something that keeps the water from going
straight into the exhaust pipe. (water injection flows down and exhaust pipe
flows up, both perfectly in the middle of the larger standpipe)
   I'm curious since I know nothing lasts forever. This system appears
original from almost 30 years ago. If  I've ever got to replace it, I'd like
to replace it in kind and not have to worry about it for another 30 years.
   Has anyone tried this exhaust on an engine other than an A4? I'm so
impressed with this design that I don't understand why water lift mufflers
were ever designed!!
Thanks and regards,
Brian    A30 #497  Free Spirit
----- Original Message -----
From: "George Dinwiddie" <gdinwiddie at min.net>
To: <public-list at alberg30.org>
Sent: Saturday, May 26, 2001 5:21 PM
Subject: Re: [Alberg30] Exhaust Pipe


> Chris,
>
> The exhaust pipe is generally black iron, though you can use bronze
> pipe and some older systems are made of copper.  As others have said,
> the bridgedeck location is not ideal for a compass.  You can compensate
> for the iron in the engine and exhaust, but you'll still need a
> different deviation table when the engine's running, due to the
> magnetic field of the electric currents.
>
> Many people have mounted compasses in the bulkheads.  Some have mounted
> the compass on the companionway slides.  Our compass is mounted on a
> board that slides into the companionway like a hatch board.  It's a
> bit of a nuisance to step over and you have to store it somewhere,
> but it's a pretty simple solution.
>
>  - George
>
> Christos Katehis wrote:
> >
> > Almost Exhausted in searching for the magnetic
> > field.......................after purchase of new compass, I
> > found it !
> >
> > What type of material is the exhaust pipe leaving the Atomic4
> > supposed to be? Because the material that is now on #383 is
> > affecting the compass. I guess it was re-done with the wrong
> > material.
> >
> > Thank you,
> > Chris Katehis
> >
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