Crazy thought- thru hull exhaust.

My buddy Shawn bought Brian's (Hotboat) '91 with the through hull exhaust. I have to say it sounds sweet. I thought it would be obnoxious to foot behind, but I was wrong. At 100' and at water level, it sounds like my boat. From the shore, it sounds a little like a drag boat. The other nice thing is that it's not too load inside the boat.

I'd rather poison the fish than my passengers, so this looks intriguing..... the marine fresh air exhaust adaptor I always wondered if you could do and I had to google it to see. Wow that's brilliant. No soot on my transom. I need a new platform anyway I might go solid and see how that does. I am not having gas or buring oil types of smells, it's just exhaust and obviously that's part of having a 78 boat but I'll have to investigate some more since I'm always the selfish bastard driving :)

Thinking Pete has been sniffing too many exhaust and glue fumes, lmao!!

Get carb worked out, if you feel problem still exists then by all means add barrier as mentioned above. The factory did it at some point, early 90's IIRC for the open platform, today they are all closed platforms for this exact reason.

Ok, you said minimize, I said avoid. Pretty similar, but I agree not exact.

With a following breeze, my '63 gets fumes in the back seat at speeds in maybe the 8-18 mph range. I have no platform. But I've had so much fun in that boat cruising around with friends/kids in any and all seats that the last thing I'm going to do is minimize back seat usage. I usually just add some throttle and get on plane, with the smaller wakes and speed generated breeze the fumes are gone.

Pete, sometimes I just have to push back a bit. Avoid having passengers in the back seat of his boat? The guy has a very cool classic boat, if I was him I'd have passengers back there and cruise around the lake every chance I got. That's not the answer.

Oh, and flappers have no impact at all, they are just there to avoid taking a wave up the tailpipes with the engine off. Most older boats don't have them anyway.

I have a 1978 Correct Craft. Any ideas on reducing exhaust odor? Will new exhaust flappers help reduce does it really matter? Mine are a bit tore up... back seat passengers sometimes complain of exhaust odor, which is normal for an older engine duh. It has gotten better b/c my mechanic explained to me that people often put too much oil in my particular engine so since we dialed it down it's been much better. I was wondering if I swapped to a solid platform with no gaps and just solid wood and potentially extend it out a few inches it might give the exhaust a little more of a barrier to transmit odors and wash out with less backdraft ...That yellow correct craft gives me a lump in my pants.

My 75 Nautique has copper tubing and no muffler. Yes, it is louder than the other boats on the river but it has a nice rumble. Everyone knows who it is when my boat is running.

Headed to work- I will post some pictures later. Thanks for the comments 63skier

Spears CPVC has a maximum temperature rating of 200 F. probably not enough for a dry exhaust

So cpvc pipe can be used????

The trapped water has to climb about 12", that's not enough head pressure to choke up a V8 exhaust.

How does it work with an inboard's wet exhaust heading down under the floor, then uphill to those very high pipes on the transom? I'd have thought either the water has to be scavenged elsewhere or it would create a trap that impeded exhaust flow.

That's awesome!

Something to consider if the exhaust is above the platform is the station wagon effect and the possibility of exhaust fumes lingering back into the boat.