Crazy thought- thru hull exhaust. |
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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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
Gold Member Joined: June-30-2013 Location: Salem MA Status: Offline Points: 831 |
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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. |
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1988 Barefoot nautique-454
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Air206
Grand Poobah Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3000 |
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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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DayTony
Gold Member Joined: June-30-2013 Location: Salem MA Status: Offline Points: 831 |
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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.
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1988 Barefoot nautique-454
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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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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JPASS
Grand Poobah Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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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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'92 Correctcraft Ski Nautique
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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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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'63 American Skier - '98 Sport Nautique
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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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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Orlando76
Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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Do it.
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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort 1993 Ski Nautique purple and black 351 HO PCM |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Fresh Air Exhaust makes underwater adaptors.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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I'll take a look- thanks
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DayTony
Gold Member Joined: June-30-2013 Location: Salem MA Status: Offline Points: 831 |
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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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1988 Barefoot nautique-454
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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This is my opinion as well. It's not that far from being original! |
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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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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quinner
Grand Poobah Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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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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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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That's awesome!
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DayTony
Gold Member Joined: June-30-2013 Location: Salem MA Status: Offline Points: 831 |
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1988 Barefoot nautique-454
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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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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'63 American Skier - '98 Sport Nautique
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Air206
Grand Poobah Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3000 |
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Hmmm,..... Orange,...... motor tweaked.........Shrimp Tique version 1.0? |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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The trapped water has to climb about 12", that's not enough head pressure to choke up a V8 exhaust.
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MSST30
Newbie Joined: August-19-2009 Location: BIRMINGHAM, AL Status: Offline Points: 21 |
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Standard schedule PVC (white) is rated for 140 degrees. CPVC has a higher heat rating.
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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So cpvc pipe can be used????
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MSST30
Newbie Joined: August-19-2009 Location: BIRMINGHAM, AL Status: Offline Points: 21 |
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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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MSST30
Newbie Joined: August-19-2009 Location: BIRMINGHAM, AL Status: Offline Points: 21 |
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Spears CPVC has a maximum temperature rating of 200 F. probably not enough for a dry exhaust
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4234 |
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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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'63 American Skier - '98 Sport Nautique
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velde99
Platinum Member Joined: November-04-2012 Location: Tampa Florida Status: Offline Points: 1108 |
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Headed to work- I will post some pictures later. Thanks for the comments 63skier
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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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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MSST30
Newbie Joined: August-19-2009 Location: BIRMINGHAM, AL Status: Offline Points: 21 |
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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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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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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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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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