[Alberg30] Exhaust

[Kevin Blanc]

FWIW, here's how I did my exhaust on my A4 equipped boat..

Right out of the flange, with a 1" nipple  I did a 90 and went up 8 
inches or so. Don't use a closed nipple: you won't be able to fasten the 
flange to the exhaust  manifold - the top bolt will be obscured. I did 
most of this assembly off the boat.) Then another 90  to go straight 
back. Then a 45 to start heading down. Immediately, I used a Y, 
injecting the water "vertically", the exhaust still running at 45 
degrees. I guess this is more like 55 degrees as the engine is mounted 
 at an angle. Then a short nipple to which the 1.25 hose was connected, 
the other end of the hose connected with a very short run to the plastic 
muffler. It's always worked just fine. The muffler is not too hot to touch.

I used galvanized 1.25 pipe. There are two arguments against using this. 
The first is it isn't as durable as bronze. The second is that, if 
raised to a high enough temperature, the zinc can gas off and be dangerous.

With regard to the first, if I had it to do again, I'd use bronze, IF I 
could find a Y (it was almost impossible to find in galvanized - I had 
to order it).  Still, the galvy stuff has been durable. The alternative 
to the Y is a very expensive water injection elbow - a better solution, 
but the system I was replacing didn't have one, and I couldn't find one.

As to the zinc gassing off, I think you'd need to be near welding 
temperatures for it to matter much. I could be wrong, but I've never had 
a problem.

Alberg30 wrote:

> If I understand your question.  You cannot run hot exhaust  in a 
> rubber hose from the exaust flange.
>
>  
>
> Bill   " WINSOM"
>

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