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Crazy thought- thru hull exhaust.

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velde99 View Drop Down
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    Posted: September-26-2016 at 3:52pm
So I have a 1991 barefoot Nautique I am putting back together. I have uploaded a video of it running on YouTube.   The engine bay would allow me to run straight pipe exhaust through the back no problem. I have seen some ski boats with exhaust on the sides. Want to hear the roar of the 454. I had a boat with straight/ thru hull exhaust and loved it!! Figured I'd ask for some opinions.



https://www.youtube.com/watch?v=YHMMLIUyGGQ&feature=youtu.be
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DayTony View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DayTony Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 4:02pm
first of all when i watched your video the first thing that youtube put up as related video was "how its made, chicken nuggets"
Whats up wit that? haha

when you say straight/thru hull exhaust are you talking like your going to punch holes above the platform like a cigarette boat exhaust? or are you just thinking of straight piping it into two exits similar to the earlier BFNs? (below the platform between the stringers)

personally i like the sound of the 454 but i wont be making mine any louder on purpose anytime soon, i like people to know its there but not when i'm pulling into a crowded lock or making maneuvers early AM at a private lake.
To change to dual exit similar to the earlier model BFNs i dont think would be a mistake but to straight pipe it above the water line your looking at a substantial increase in Db. so thats something to consider.
1988 Barefoot nautique-454
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Air206 Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 4:05pm
Brian (Hotboat) put them straight thru the transom on his 91 BFN - above the waterline and the swim platform..... It was loud...... There was exhaust on the swim platform and I don't think your neighbors would care for it...... but it was loud.

Mark has a dual exhaust on his 91 BFN below the platform / waterline.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DayTony Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 4:14pm
on that note.....some down-swept (below water line) side exits would probably sound pretty cool. similar styling to a 40' post or most big sportfish boats. I cant say i have seen it on a lake boat before.
1988 Barefoot nautique-454
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 4:18pm
The muffler is broken on both sides in this boat. I thought if I ran the exhaust through the hull (above the waterline) like a cigarette boat it would be cool. The muffler is trash- and I wasn't sure if anyone has ever piped a vdrive. Easy on a traditional boat to remove the muffler. Not even sure what materials are used for it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JPASS Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 4:44pm
There's a guy on the lake we frequent who has Chris Craft cuddy cabin with the exhaust exiting above the rear platform. It sounds sweet and can be heard from clear across the lake.


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63 Skier View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 5:12pm
There's no harm in doing it, I doubt it will have any performance gains, the muffler isn't very restrictive. I'd say the only caution is to make sure you aren't routing the pipes "uphill" at all as they head to the transom.

I wouldn't want it, prefer the water muffling at non-planing speeds. My jet boat with 454 and no mufflers, just wet logs, is not at all loud at idle around the dock, but sounds very nice when you step on it. I like that better than drawing attention around the dock.

I'd suggest you delete the muffler but stay with the below platform exhaust, but just my opinion.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 5:21pm
Has anyone ever done an excel or BFN below the waterline? Not sure what materials to use. Do the make a PVC style pipe that is heat rated for exhaust.?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orlando76 Quote  Post ReplyReply Direct Link To This Post Posted: September-26-2016 at 7:52pm
Do it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 12:16am
Fresh Air Exhaust makes underwater adaptors.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 12:17am
I'll take a look- thanks
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DayTony Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 8:31am
if you want to glass and fair in a set similar to this

In that case I would use FRP tubing rather than PVC. Epoxies and resins will not make a strong bond to pvc and I wouldnt want it below the water line.

other style thru hulls will get installed with 5200 or similar sealant.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 9:00am
Originally posted by 63 Skier 63 Skier wrote:

I'd suggest you delete the muffler but stay with the below platform exhaust, but just my opinion.

This is my opinion as well. It's not that far from being original!


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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 9:03am
Yes I have decided to delete muffler- and stick with original exhaust port. In the near future I will post the progress. Someone sent me a photo of their resto- which I was not a fan of- but it gave me ideas! Gonna stick below waterline.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote quinner Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 9:45am
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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hollywood Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 11:39am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 11:43am
That's awesome!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DayTony Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 12:47pm


1988 Barefoot nautique-454
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 12:53pm
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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Air206 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 1:27pm
Originally posted by Hollywood Hollywood wrote:



Hmmm,..... Orange,...... motor tweaked.........Shrimp Tique version 1.0?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hollywood Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 2:31pm
The trapped water has to climb about 12", that's not enough head pressure to choke up a V8 exhaust.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MSST30 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 4:45pm
Standard schedule PVC (white) is rated for 140 degrees. CPVC has a higher heat rating.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 4:59pm
So cpvc pipe can be used????
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MSST30 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 5:08pm
I do know about using it as an exhaust piping. In the plumbing industry schedule 40 is only rated for piping carrying water at temperatures of 140 and less. it will soften ad begin to sag at higher temperatures. I definitely would not use it if water was not running with the exhaust. I am not sure what temperatures ratings are for CPVC. Google Charolette pipe and you should be able to find the temperature ratings for CPVC
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MSST30 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 5:19pm
Spears CPVC has a maximum temperature rating of 200 F. probably not enough for a dry exhaust
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 63 Skier Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 5:40pm
I have experience with schedule 80 PVC, and while more robust than schedule 40 it still drooped quite a bit with hot water in a factory environment. Doubt you'd have good results with CPVC.

Not sure I'm picturing correctly what you are trying to do. Wouldn't you use exhaust hose onto standard exhaust tips?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote velde99 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 5:50pm
Headed to work- I will post some pictures later. Thanks for the comments 63skier
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 6:50pm
Rod,
I'd stay away from PVC all together. Yes, it may work and has for some but keep in mind that the section you want to replace is below the water line. I don't feel it's worth taking a chance. FRP tubing, rubber hose all the way, aluminum, SS or even copper are better choices.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote MSST30 Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 7:03pm
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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SNobsessed Quote  Post ReplyReply Direct Link To This Post Posted: September-27-2016 at 9:04pm
The PVC temp problem is not normal operating conditions, rather the overheat condition when the RWP fails. Failures happen, best not to let them cause a secondary failure, like sinking the boat.
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