PVC y pipe gt40 muffler delete |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
![]() ![]() ![]() ![]() ![]() Posted: August-17-2015 at 6:53pm |
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Well thought I would share this, anyone running the hull hugger muffler here is a option for you to get more sound if you like. The Only thing I've seen on the Internet was the custom aluminum built y pipes and the High dollar Centek y pipe$$$.. This was made using schedule 40 pvc parts from Lowe's and my buddy giving me some pipe as well.. It's deff louder at idle which was what I was after and probably 20% louder at cruising speed 21mph.. Comments welcome.. If u had to buy the parts from Lowe's I'm guessing it would b less than $50
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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Gary S ![]() Grand Poobah ![]() ![]() Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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While I admire the effort I'm concerned about using plumbing pipe and the heat generated. If it was a good idea think of the money a boat builder could save when building multiple boats. It is the only thing between you and the bottom. If something happened I think an insurance company or a lawyer would be rubbing their hands with glee if that was found IMHO.
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Hollywood ![]() Moderator Group ![]() ![]() Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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Scary.
Straight pipe with no couplers or elbows is dangerous enough... |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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Gary.. time will test it.. with out motors having wet exhaust and temps around 160 range plus the heat from the risers also.. We ride 5min from the ramp so if one the joints do spring a bad leak from heat as you say.. I don't have far to get towed lol..
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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Kevin.. your not a fan of straight pipe exhaust on Correct Craft. Come on now..what a awesome sound.. music to my ears ![]() |
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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Orlando76 ![]() Grand Poobah ![]() ![]() Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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I believe PVC has a heat rating of 140. The other day I wrapping up a warm engine temperature hunt and I was curious as to what my exhaust temp was. With the engine at 160 my exhaust was only 104. My bath water is warmer than that. I doubt the pvc melting is an issue.
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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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8122pbrainard ![]() Grand Poobah ![]() ![]() Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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I totally agree with Gary. With the exhaust being below the water line, the use of the PVC is very risky. Make sure you keep close to shore and you have plenty of bilge pump! ![]() |
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8122pbrainard ![]() Grand Poobah ![]() ![]() Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Todd, You're measuring the water temp. What's the exhaust temp? Yes, the overall temp is a blend of the two but there are hot spots. If anything happens with the RWP, there may be a meltdown if not caught right away. At least the PVC would cool down when the hull floods! ![]() |
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TRBenj ![]() Grand Poobah ![]() ![]() Joined: June-29-2005 Location: NWCT Status: Offline Points: 21141 |
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Agreed that the exhaust water is not that hot under normal conditions... It's the unexpected overheat that'll cause problems fast. I've seen exhaust hoses melt and they're good for 200+. Not a great place to try and save a buck, but that's just my opinion.
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baitkiller ![]() Platinum Member ![]() ![]() Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Well I hope you used CPVC cement at least???? I think what the guys above me think.
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Jesus was a bare-footer.............
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peter1234 ![]() Grand Poobah ![]() ![]() Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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cpvc cement is for cpvc.. please dont give bad advice. solid core pvc is generally rated for 180 deg but i would never use is (lowes home depot sells foam core) foam core is not for exhaust either i guess you could try sch 80 but it is only really used for 95 + venting exhaust on newer high eff heating /Hw systems .. i completely agree with above posts dont trust the pipe dont trust the joints and def dont trust the glue..
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former skylark owner now a formula but I cant let this place go
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Orlando76 ![]() Grand Poobah ![]() ![]() Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108 |
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I actually shot up inside the pipe for a temp, don't recall that actually number but it was close. My experience overheats seem to happen quick and sometimes too late. Exhaust Hoses melt. Maybe the pvc will be the weak link and melt and flood the boat before the motor cracks. I wouldn't use the pvc for anything more than temporary, but then again, four years later and my temporary gorilla tape is still plugging a leaky exhaust hose. |
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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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peter1234 ![]() Grand Poobah ![]() ![]() Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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gorilla tape is a whole different thing. id trust is more than welded stainless...........
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former skylark owner now a formula but I cant let this place go
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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Appreciate everybody's opinion and comments thus far.. Schedule 40 has to see close to 200F before it even starts to soften.. I agree if this pipe fails it will be in a joint.. and yes I did use high quality Oatly pipe cement for the fittings.. I don't mind being the guinea pig for testing it lol.. If it does fail like I said I don't pull far from the ramp so I will just have to shut her down immediately and get a tow from one of my buddys..
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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peter1234 ![]() Grand Poobah ![]() ![]() Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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good idea i would never listen to a plumbers advice either
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former skylark owner now a formula but I cant let this place go
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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8122pbrainard ![]() Grand Poobah ![]() ![]() Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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What about the primer? I don't see any evidence of it in the pictures! |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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And you won't see the primer I used past the fittings Pete because I measured how far to apply it on the pipe/fitting so it wouldn't show.. my OCD kicked in ![]() |
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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peter1234 ![]() Grand Poobah ![]() ![]() Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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Pete we have a new code here for gas exhaust venting we have to use the purple primer in your neck of the woods too?
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former skylark owner now a formula but I cant let this place go
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baitkiller ![]() Platinum Member ![]() ![]() Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Bad advice? Jesus H Christ what the hell is wrong with you? You allergic to sarcasm or so wrapped up in plumber tech you cant see over the sprinkler heads? STFU |
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Jesus was a bare-footer.............
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a0128 ![]() Senior Member ![]() ![]() Joined: May-05-2014 Location: Oregon Status: Offline Points: 226 |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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8122pbrainard ![]() Grand Poobah ![]() ![]() Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Your OCD is flawed. You still have the alignment marks on at the joints! ![]() Peter, I'm not aware of any ruling about having to use the purple primer in this area but, it sure is a good one. The other big problem with primer is not using it at all (typ. on DWV with plumbers cutting corners) or letting it dry before applying the solvent cement. I'm proud to say that after running close to 2000 feet of sch 80 10" and down to 3" and then hydro'd to 250 psi we didn't have one joint push apart. BTW, we have been back up and running for over 6 weeks now after the repair. |
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NAUTIQUEjunky ![]() Senior Member ![]() ![]() Joined: July-17-2010 Location: Henderson NC Status: Offline Points: 210 |
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Lmao! You got me on that one Pete!
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1977 MasterCraft Stars&Stripes
1994 Ski Nautique 2000 Super Air Nautique 1986 Ski Nautique 2001 1999 Sport Nautique gt40 current |
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Gary S ![]() Grand Poobah ![]() ![]() Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Down in my part of Florida Pete the inspector wants to see primer slopped all over,don't see it,it don't pass
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DayTony ![]() Gold Member ![]() ![]() Joined: June-30-2013 Location: Salem MA Status: Offline Points: 832 |
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I'm no plumber but i have built some pretty good potato cannons. and some not so good.
But knowing what the pvc looks like after a good range day I would have to say i wouldn't trust any bit of it below the water line on my boats. especially with the exhaust gasses which are extremely corrosive. i wonder what it would do to the pvc. also do you have any idea how quickly you will be swimming with the fishes with a 3" hole under the waterline of a boat that small? I just finished safety drill training at my local coast guard base which covered this specifically. And just to give a little perspective, an open exhaust pipe below water line left unnoticed can leak roughly 150-200 Gallons per MINUTE, becoming exponentially more as the hole gets deeper in the water. So play on the safe side and if you are going to be a test hamster than bring a hammer and some exhaust size wooden plugs if you don't already have some in your ditch bag. Because time to get towed in may be too long. -Tony |
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1988 Barefoot nautique-454
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backfoot100 ![]() Platinum Member ![]() Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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EXACTLY!!!!! And this is designed to withstand that heat for short periods of time. Wait till you overheat the s**t out of that PVC. You won't have delaminated hose that simply needs replacing. You'll have a three inch hole directly thru the hull after the PVC has completely melted away. This is no different than somebody putting an automotive rated carb, dizzy, alternator, starter or fuel pump on their boat. Sure, it'll probably work fine maybe for as long as you own the boat, but all it takes is that "one time" when it goes boom and your boat is up in flames or sunk and people can potentially die all in the name of saving money. By all means let us know how that works out for you when that "one time" does happen. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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GottaSki ![]() Grand Poobah ![]() Joined: April-21-2005 Location: NE CT Status: Offline Points: 3337 |
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meh. the late eighties budget centurians came with PVC pipes from the factory and are still going.after 25+ years. They are the dull ones with the fiberglass engine cover with a tiny apolstered pad on top of it.
Agreed, offshore, not even a consideration. I just don't buy most the doom and gloom. They sound like blue man group on meth, don't like the sound one bit |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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74Wind ![]() Grand Poobah ![]() ![]() Joined: August-02-2011 Location: Georgia Status: Offline Points: 2101 |
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Keep 2 tennis balls in the boat,. In the event of an emergency they can be stuffed into the exhaust ends.
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1974 Southwind 18
1975 Century Mark II |
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Hollywood ![]() Moderator Group ![]() ![]() Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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That won't keep the boat from sinking
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