Invertaflow muffler question

Taking the stand pipe out would just turn the muffler into a straight Y pipe.

Lower flow restriction & louder exhaust sound would be the result.

SNobsessed wrote: Taking the stand pipe out would just turn the muffler into a straight Y pipe. Lower flow restriction & louder exhaust sound would be the result.

That seems right to me...

dwouncmd wrote: SNobsessed wrote: Taking the stand pipe out would just turn the muffler into a straight Y pipe. Lower flow restriction & louder exhaust sound would be the result. That seems right to me...

I don't think it'll be louder. The water level in the tank is what's doing the muffling.
I seem to remember somebody else here that completely removed all the baffles when they blew out the invertaflow and repaired it. There wasn't any noticeable difference in the sound.

JP,
I'd be surprised if the exhaust system sees more than 2 to 3 PSI. I thinks your repair is fine. The system is pretty open and doesn't back up much head of water. It takes 27" of water column to create 1 PSI.

dwouncmd wrote: I think the leaks occur as the thing falls apart. It is mostly full of water all the time. Maybe freezing in the winter time leads to cracks, leaks and the small pipe coming unglued? Unless you run antifreeze through until it comes out the exhaust, the water left in would freeze.

Well that's not good,I have been using the pour method,can anyone verify that there is any water left in the muffler? You would think that there would be some sort of drain or reference to this in the owners manual. Maybe a call to the muffler manufactor is in order?

If freeze expansion was a problem, wouldn't all of us northerners with this muffler have failures by now?   Mine seems to be fine (knock on wood).

JoeinNY wrote: I cant imagine it doesnt hold a bit of water but it would have plenty of room to expand and gives a bit more than cast. When is the last time you saw water in an open plastic bucket cause a problem when it froze?

I just wonder if the freeze/thaw expansion cycle has anything to do with the cracks, leaks, and particularly the inner pipe working loose. I think there is plenty of room above the waterline for expansion, but I bet the water in the muffler freezes solid.

Our boat has been a Florida boat it's entire life. freezing had nothing to do with our leaks.

Orlando76 wrote: I would think if it didn't hold water, then when you crank it on the trailer for a slight second it'd be louder until it filled up as the water does a good part of the muffling??

Mine is definitely louder when it first starts even at the dock.
Here is the responce I recieved this morning---

Good morning Gary,

You are correct, by design, we have always included a drain hole in the outlet pipe of the muffler in order to drain water when the engine shuts down. However, a very small amount of water will remain inside of the muffler. This small amount of water will not pose a problem if it were to freeze. If the muffler was full of water, then you would need to worry about getting antifreeze into the muffler. We also include drain screws in the mufflers to drain water as well.

Let me know if you have any other questions.
Regards,
Bert Browning

Centek Industries, Inc.

Manager, Product Design & Engineering

Mechanical Engineer

Phone: 1-229-228-7653

Mobile: 1-229-224-5653

Fax: 1-229-228-1270

Email: browning@centekindustries.com

SKYPE: bertbrowning

I have a small screw on the starboard side of the the muffler body about an inch up from the bottom edge. It's currently glassed over. Haven't decided if I'm going to drill it out again.

I did not see any other drains on the muffler.

I do recall seeing a small hole near the bottom of the spillway insert under the hat near the base of the muffler housing. Maybe this is what he was referring. I could see how this would allow water to exit the exhaust naturally, albeit slowly, at levels below the top of the spillway pipe.

I went back a page and noticed the video I posted has the hole I'm referring to right there.