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PVC y pipe gt40 muffler delete
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NAUTIQUEjunky View Drop Down
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Points: 210 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NAUTIQUEjunky Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 8:32pm
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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Points: 2756 		Post Options Post Options   Thanks (0) Thanks(0)   Quote peter1234 Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 8:31pm
gorilla tape is a whole different thing. id trust is more than welded stainless...........
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Originally posted by 8122pbrainard 8122pbrainard wrote:

Originally posted by Orlando76 Orlando76 wrote:

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.

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!


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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peter1234 View Drop Down
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Points: 2756 		Post Options Post Options   Thanks (0) Thanks(0)   Quote peter1234 Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 8:14pm
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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Points: 1693 		Post Options Post Options   Thanks (0) Thanks(0)   Quote baitkiller Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 7:54pm
Well I hope you used CPVC cement at least???? I think what the guys above me think.
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TRBenj View Drop Down
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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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Points: 41040 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 7:40pm
Originally posted by Orlando76 Orlando76 wrote:

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.

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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8122pbrainard View Drop Down
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Originally posted by Gary S Gary S wrote:

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.

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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Orlando76 View Drop Down
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Points: 3108 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Orlando76 Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 7:30pm
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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NAUTIQUEjunky View Drop Down
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Originally posted by Hollywood Hollywood wrote:

Scary.

Straight pipe with no couplers or elbows is dangerous enough...


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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NAUTIQUEjunky View Drop Down
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Points: 210 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NAUTIQUEjunky Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 7:15pm
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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Hollywood View Drop Down
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Scary.

Straight pipe with no couplers or elbows is dangerous enough...
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Gary S View Drop Down
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Points: 14096 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: August-17-2015 at 7:05pm
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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NAUTIQUEjunky View Drop Down
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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 [/IMG]       [/IMG]
1977 MasterCraft Stars&Stripes
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2000 Super Air Nautique
1986 Ski Nautique 2001
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