Irwin 32 Exhaust System

[Chief Engineer]

From the atomic 4....and exhaust pipe goes about 12 inches into a pipe 3" diameter (Looks like ans L) at the lower end of the L the 3 inch pipe goes vertical about 2.5-3 feet....to the exhaust hose......It seems that this is very prone to over cranking damage......Any Irwin Owners out there who know about their exhaust systems?

[Chief Engineer]

I will post a couple picture tomorrow(today).

Could not find any pictures on the web.



Looks like this:


HHHHHHHHH3
................3
................3
................3
................3
................3
................3111111111111Engine
H=Hose
3=Pipe/Muffler
Bottom 3 is a 3x14" pipe(Collector)
1=1 1/4 " exhaust line from engine
Water is injected at bottom collector
......are for spacing

[Irwin325]

Very familiar with this problem. I can say it will only happen once to you because you can't afford to do much more. I have an Irwin 32.5 Center Cockpit and just replaced the A4 with a Moyer Marine long block. Well the ethenyl in the gas was eating the resin in the fiberglass tanks and sticking to the valves. I over cranked and filled the cylinders with water causing me to blow my head gaskets on my brand spankin new engine.
TURN YOUR SEACOCK VALVE OFF AFTER 25 seconds of cranking on the engine cause it should not start that hard if everything is adjusted properly(get the new electronic ingnition ASAP) and check your or have your carb checked. You can always do the finger check on the spark plug holes also to make sure you have good pressure on the cylinders(if you can hold your finger over while cranking you have a problem).

But for sure if your trouble shooting why your engine will not start turn off the water inlet valve cause your engine needs the combustion gases to carry the water out of the system. No gases and you have four flooded cylinders and a blown set of head gaskets.

[Stillraining]

Yes I know about mine but I don't have an Atomic...FWIW I always start with raw water closed and open immediately upon fire...another tidbit..my exhaust run is so long I don't need a muffler... you would never know it by listening to it.

[Chief Engineer]

The whole unit and the top of the vertical pipe

[cal40john]

Could it be a form of stand pipe muffler? The exit point should be lower down if it were, but I can't see how this could possibly be a waterlift unless there is more piping welded inside the large vertical pipe to reduce the diameter.

Scroll down to page 117 on this link if unfamiliar with stand pipe muffler:

Boat Mechanical Systems Handbook ... - Google Books

John