Exhaust Mixer or Not?

[Dream Maker]

We have a Next Gen generator whose stainless steel exhaust mixer has corroded from the inside out after 500 hours and 2.5 years. Is this normal?

Are there after market products that we could install instead of getting a replacement from the manufacturer that would have a longer life? $400 seems llike a lot to spend every 500 hours.

The generator is also connected to a water lift muffler from the old generator installation. Do we need the exhaust mixer on the generator if we have the water lift muffler or do they accomplish different tasks.

Any input would be greatly appreciated. Thanks in advbance.

[Sailmonkey]

You need both, the mixer injects water with the exh. to cool the gases so they may be piped off the boat in a rubber hose. The water lift muffler allows the exh to push the water up above the discharge point so that it may flow out with the exh.

unfortunatly when you mix stainless, hot salt water, and exh you don't get much life out of them. Cast iron actually lasts longer in most cases. You can make your own (if your handy) out of bronze pipe, or just bite the bullet and buy another one of these.

[Cheechako]

I agree, cast iron might be better, but not likely you'll find one. I made one out of black pipe fittings once. worked fine. I dont think it's very scientific really. Just match the pipe size and weld in a piece of tubing for the water hose the right size and at an angle (or maybe not!)