loud SN |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5695 |
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I wonder if you could get louder manifolds by putting the riser gasket in backwards?
Have you tried replacing the exhaust manifold gaskets? |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6149 |
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Agreed something odd is going on. My dad's 98 is barely audible at idle speed with the hull hugger. All you can here is the normal exhaust noise of it passing through the pipes/glass down tubes.
Even my 85 is quiet to me but I love the sound of the stock mufflers. |
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KRoundy
Platinum Member Joined: August-23-2010 Location: Lake Stevens Status: Offline Points: 1702 |
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Before you do a flow test: It will be a lot easier to just open up the impeller and look at the insides. I am guessing that you'll see the problem immediately. If not, then you could do the flow tests.
I went to school in east Texas (Longview), but while in school got to see the state quite a bit. I miss the people in Texas, but that summer heat can be a bit much. Welcome to the site! |
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Previous: 1993 Electric Blue/Charcoal Ski Nautique
Current: 2016 Ski Nautique 200 Open Bow |
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GottaSki
Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3335 |
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Upon loosing one exhaust flapper, my boat sounded markedly different/louder at 15-25 mph.
therefore i inquire, is your exhaust flapper torn away or missing? |
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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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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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terminaldegree,
unfortunately you can't carry on a conversation in mine! I'm going to check out the water volume as Art suggested. I really think that is going to be the solution. Hook 'em Horns! Are you living in Wisconsin? If so, no wonder you miss the Texas hill country! My first inboard was an '79 MasterCraft stars and stripes. I loved that boat but looking back I can say for sure it wasn't built like the Correct Crafts. |
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terminaldegree
Groupie Joined: October-05-2014 Location: Georgia, USA Status: Offline Points: 90 |
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Greetings, antique boater, from a fellow '96 sport owner. I, too, wish my boat were just a little quieter, but it's not too bad sitting in any of the locations in front of the motor, and definitely the worst in the stern seat, anywhere from minimum planing speed to about 25 mph.
I have considered the FAE option, but I don't want to restrict the performance of my boat in any way from the factory setup. My wife and I have a set of fitted musicians' earplugs that we can wear for longer rides (with 9db filters in, everything sounds quite realistic, just a little softer...works great at the movies, too). Since I'm a whisker cheap, and may need to replace another manifold sometime in the next year, I'll probably leave it all alone. I miss boating in the hill country - I'm a UT-Austin grad and used to take drives up there for grins with friends, and got to pilot an old 1980 stars n' stripes Mastercraft on lake Travis in the early 2000s...back when there was water in there! |
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1996 Sport Nautique GT40/Acme 422
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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Art. that's a great idea. In fact, that's exactly what it sounds like to me.... a dry exhaust. I will definitely check that out as soon as it gets above freezing.
Buchanan Dam is in the Texas hill country about 50 miles from Austin. I'm 2 minutes from Lake LBJ, 5 minutes from Inks Lake and 10 minutes from Lake Buchanan. Can't ask for much better location than that unless you live on the lake. And around here that means a lot of cash for the home and taxes. thanks a million for the advice. and thanks to everyone else for your help. i'll let you know what i find. |
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ArtCozier
Platinum Member Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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I haven't had time to read all the posts, but has anyone suggested that you might not be pumping a full amount of water to the cooling system? The way those engines are set up, they give priority to the engine cooling, and excess water goes straight to the manifolds. So if your pump isn't delivering a full amount of water, it won't show on the temperature gauge. How old is your impeller? Is the inside of the pump worn? Are you using a genuine Sherwood impeller? (Sierra impellers don't have the same design, no matter what the catalog says)
You can do a volume test if you want: Take the hose off the top fitting of the water pump (the outlet) and stick a garden hose in the hose going to the thermostat housing to supply water to the engine while you do this test. Put a piece of 1" hose 3-4 feet long on the fitting where you took off the engine hose. Turn on the garden hose, then start the engine. The water coming from the pump should fill a 5-gallon bucket in 16 to 20 seconds. You are looking for a minimum of 17 to 20 gallons per minute at 1200 to 1500 rpm. The formula is: Gallons divided by seconds, times 60 = gallons per minute. Nice looking boats; welcome to the site. Where the sand-hill is Buchanan Dam??? |
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"Art"
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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thanks again everyone. I'll try to get a sound meter and post the results.
cheers! and yes, go team red! |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Sharp looking boat. Go Team Red!
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skutsch
Grand Poobah Joined: June-19-2008 Location: Racine, WI Status: Offline Points: 2874 |
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Interesting, that the FAE gets it so quiet that you hear more water spray then anything (probably similar to what the Electric SN sounds like). Seems like in my SPN, the air intake is as loud as the exhaust. I would suspect you would still here that. My SPN is a GT40, I never would have noticed it until someone pointed out how much noise the air intake makes on a Fuel Injected Snowmobile... Way more noise then the exhaust, will that and the track spinning.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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I have the FAE. I took it off for a while so I could hear the exhaust note but the kids asked me to put it back on (due to fumes). With it on, the water spray noise is more than engine noise. You lose about 2 mph from top end.
BTW, Pete I have that sound meter too! |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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[QUOTE=skutsch] Yep that is a good looking Sport. Oh and the Sport should be able to be used for skiing AND cruising. I have a 98, the next evolution of the sport (although the hull is the same), it makes a good barefoot platform too.
Love the color scheme on your SN skutsch. I checked out the fresh air exhaust systems at Hollywood's recommendation. Looks like it might just be a good solution. Haven't done any footing' behind the SN. My wife's not too excited about me trying either! |
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74Wind
Grand Poobah Joined: August-02-2011 Location: Georgia Status: Offline Points: 2101 |
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Uhhh Tim, you are 17 posts too late, as I previously posted the established acronym LPSL there... |
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1974 Southwind 18
1975 Century Mark II |
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skutsch
Grand Poobah Joined: June-19-2008 Location: Racine, WI Status: Offline Points: 2874 |
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Yep that is a good looking Sport. Oh and the Sport should be able to be used for skiing AND cruising. I have a 98, the next evolution of the sport (although the hull is the same), it makes a good barefoot platform too.
Here is the quick link to the Fresh Air Exhaust, Most of the wave boats at the factory had these on them when I toured last summer, not sure if they are standard equipment now or not. |
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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i'll see if i can find one and start the testing!
In the meantime, hope everyone has a great weekend. and enjoy the water! |
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Morfoot
Grand Poobah Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5312 |
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You guys are slacking.....
"LOUD PIPES SAVE LIVES!" Seriously though, nice fleet of boats you have there and welcome to CCFan! |
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Too loud? Too quite? Ears too old? Ears too young? I think it's time to get some viable data and really get down to facts. We need tests so get one of these out and start checking!
BTW, all tests need to be done on the A scale and we'll set a distance of say 6' from the transom. The 6' will allow owners of VD's to still stay in the boat. At different RPM's would be great as well. |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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Very nice. And red!
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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"Nice looking Sport by the way!"
Thanks! |
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C-Bass
Platinum Member Joined: November-18-2008 Location: Columbus, IN Status: Offline Points: 1248 |
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Nice looking Sport by the way!
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C-Bass
Platinum Member Joined: November-18-2008 Location: Columbus, IN Status: Offline Points: 1248 |
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Yeah he's got something else going on. There are several people (me included) who purposely eliminate the hull hugger altogether because it is so quiet you don't get any sort of engine noise, mostly just transmission whine. I'll admit that with a straight exhaust, our Sport is a little louder than I would like, but I like it much better than with a properly functioning hull hugger.
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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maybe my hearing is just getting much better!
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storm34
Grand Poobah Joined: November-03-2008 Location: Dexter Iowa Status: Offline Points: 4492 |
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Our 96 platform would vibrate as well. Didn't seem like it was enough to write home about but maybe you have something else going on back there.
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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that's correct. it's a hull hugger.
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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C-Bass: no. it looks like this and i replaced it right after i bought the boat. it helped a lot but not enough. the sound is mostly coming from the transom so i would think it's the exhaust that i'm hearing. and maybe vibration of the swim platform caused by the exhaust.
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13512 |
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Should be a hull hugger in a 96
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antique boater
Newbie Joined: February-27-2015 Location: Buchanan Dam Status: Offline Points: 24 |
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C-Bass
Platinum Member Joined: November-18-2008 Location: Columbus, IN Status: Offline Points: 1248 |
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I've heard a Sport Nautique of that vintage with what I would assume was the stock exhaust/muffler. It was in no way louder than a mid-80's dual exhaust SN. Wondering if your muffler has been modified/removed or maybe a blown baffle.
Does it look like this? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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It's real easy. Use the "post reply" and not the "quick". Click on the tree icon with the up arrow. The box that comes up allows you to browse your computer. BTW, we've got plenty of antiques here to keep you company! |
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