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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Is that a company perk or what? :D
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Terry....I'm on a corner on the Palaco canal...white Christmas tree on the dock out back and older blue 30 Velocity on the lift on the side canal. Watching your boats go by is usually the high point in my day. Skip
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
I rode in Terry's boat in Key West and the new quiet exhaust was awesome! I NEVER thought I'd like a quiet performance boat but this was pretty sweet. You get to hear the engine whine and no longer need headsets to have a conversation. Definitely a great idea!
Thanks again Terry. :cool: |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Skip,
Hey nice tree! Maybe I can swing by sometime and say hi. TS |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by Wild
Talked to a guy in key west with a 43 cat, I noticed that there were no exhaust tips coming out the back, he explained the new exhaust to me. Nice guy good info
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
We changed OU to eliminate the molded exhaust ports. On the 36 we left them and replaced the pipes with grilles which gives a little more ventilation. On a new boat you can get it either way.
Not a great view but here's a pic |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Looks and sounds great!
A lot of the noise reduction is because of 2 other notable items; 2-into-1 exhaust and the tailpipes are wet for a fair length, but low enough to have less risk of reversion. Of course having it under water at idle helps around the dock and being aimed back low and into the prop wash helps even more at speed, but I think a reasonable job could be done without the exit in front of the prop, just off to the sides. You could put 2into1 on cats and stagger vees to the outsides down as low a possible (might have to be a little higher because of tabs), and 2into1 on the insides on side-by-side vees. This still has to be less restrictive than mufflers. |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
Tired of the noise, the complaints, the applause when you shut it down? Well most of us still love the roar of open exhaust but the times are changing.
In response, Nor-Tech in conjunction with CMI has developed a new system for our Supercats that routes the exhaust below the waterline and through the transom below the gimbal housing. This system virtually eliminates most of the noise at idle. To relieve any back pressure there are 1" vent pipes that exit above water but the maximum at idle with Mercury 850's was 83db. Well below existing limits. In fact most of the noise present is coming from the fuel pumps and blower whine. Once on plane the exhaust is introduced into the prop flow. At high speed the only sound heard both inside the boat and outside is again, the whine from the blowers. It actually sounds like a muffled turbine. Mercury was concerned initially about possible back pressure. According to their tests not only was back pressure absent but it created a vaccum, flowing better than tail pipes. The end results, close to totally quiet and no loss of performance or horsepower. This system is available for all new Nor-Techs and available for the retro fitting of existing boats. Terry I just watched the latest video released here on OSO/powerboat TV with the clip on this whole new set-up you have developed with your team. My only question is: How does putting all that airiated pressure into the prop not affect it and increase prop slip / decrease the performance? Thanks Cougarman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
The underwater exhaust on Sunseekers 34 and 48 (actually 40 and 50 when fitted with surface drives) has nothing to do with Sunseeker. It is part of Fabio Buzzi's transom design for Trimax surface drives. It's very effective as far as noise reduction is concerned but it also virtually eliminates smoke and transom soot usually seen on diesel boats. It also actually helps performance, especially coming on plane.
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
We've delivered more than a dozen of these set-ups since this post. Haven't seen any negative side effects.
With the 6's the top half of the prop is out of the water at speed so the airiated pressure doesn't seem to change anything. |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
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It kind of reminds me of the exhaust set up on my wakeboard boat. The nortech is cool seeing it idle into a cove and you can't even hear it.
Finman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
We've delivered more than a dozen of these set-ups since this post. Haven't seen any negative side effects.
With the 6's the top half of the prop is out of the water at speed so the airiated pressure doesn't seem to change anything. Are you doing this on your V-bottom boats also or just the Cat's ? Cougarman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Didn't RICK Sr (RIP) from INNOVATION come up with this like 10 years ago on the INNOVATOR? I mean really this isn't "NEW" technology much less created / invented by Nor-Tech. Let's give credit where it is due. Just my $.02
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
We've delivered more than a dozen of these set-ups since this post. Haven't seen any negative side effects.
With the 6's the top half of the prop is out of the water at speed so the airiated pressure doesn't seem to change anything. Exhaust works AWESOME, couldn't be more happy with it!! |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by super termoli
The underwater exhaust on Sunseekers 34 and 48 (actually 40 and 50 when fitted with surface drives) has nothing to do with Sunseeker. It is part of Fabio Buzzi's transom design for Trimax surface drives.
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by Ryan Beckley
Didn't RICK Sr (RIP) from INNOVATION come up with this like 10 years ago on the INNOVATOR? I mean really this isn't "NEW" technology much less created / invented by Nor-Tech. Let's give credit where it is due. Just my $.02
Absolutely! :eureka: |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by Ryan Beckley
Didn't RICK Sr (RIP) from INNOVATION come up with this like 10 years ago on the INNOVATOR? I mean really this isn't "NEW" technology much less created / invented by Nor-Tech. Let's give credit where it is due. Just my $.02
It was also an underwater exhaust but that's about all it has in common with what we're doing now. Basically the exhaust was routed down to a collector box at the aft of the bilge and then would exit down into the notched transom. Unfortunately about the only good thing was that it was quiet. Two major problems: Since the exit was down thru the bottom of the boat, there was no relief for the exhaust and caused significant back pressure. A 24V starting system was required. The other problem was whenever the boat launched and landed there was again so much back pressure that the engines would bog down and lose all throttle response. I don't think anybody can take credit for underwater exhaust being "NEW" technology. What we did was come up with a new and unique way to make it work without any of the negatives. TS |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Terry, have you tried this exhaust set up on a V-Hull with a Bravo style drive yet?
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by Ryan Beckley
Didn't RICK Sr (RIP) from INNOVATION come up with this like 10 years ago on the INNOVATOR? I mean really this isn't "NEW" technology much less created / invented by Nor-Tech. Let's give credit where it is due. Just my $.02
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Sounds like a great setup, i love quiet, nothing drove me nuts like driving around with a noisy CAT 3126 about 12 inches from my butt. The guy who designed the exhaust on that thing was the dumbest human alive. He managed to create a perfect resonance at idle and cruise speeds, it was absolutely painful to drive that stupid boat.
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
I don't think anybody can take credit for underwater exhaust being "NEW" technology. What we did was come up with a new and unique way to make it work without any of the negatives. TS |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
just a question ,how about sitting in open water can waves and water get pushed up into cyls thru open exhaust valves,otherwise sounds cool
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by dmaxx3500
just a question ,how about sitting in open water can waves and water get pushed up into cyls thru open exhaust valves,otherwise sounds cool
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by FeverMike
Terry, have you tried this exhaust set up on a V-Hull with a Bravo style drive yet?
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
We have on the 50 V with 6's. On the Bravo we use transom mounted turn downs to put it under the water at idle only.
What power was in the 50" V-Bottom? Did you notice (Anything) Different from the cat to the V-Bottom? Also I for one like the sound of two into one exhaust very unique very different. But if memory servers me seems the biggest reason people have gotten away from that is the ( Y ) pipe cracking at the welds with heat expansion. I don't see that as a problem with your rubber connectors. But in the past year or two the 41' Apache WarHawk was restored and he had two into one exhaust and was hoping to go with it again. Can't remember the details, but if memory serves's me ( I Think ) Teague wouldn't warranty the engines in the configuration. Or felt the would make the proper power, they are Teauge 900's................. So is Mecury concerened with that? Also are you increasing you exit pipe, like going from two 4" pipes into on 5" or 6" pipe to keep the flow? Thanks Cougarman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
The 50 V had trip 850's
The collector pipe is 6" i.d. Mercury loves the system and is pushing for everyone to do something like this. |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by salesmanship
The 50 V had trip 850's
The collector pipe is 6" i.d. Mercury loves the system and is pushing for everyone to do something like this. Thanks Cougarman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
It would be great to have this available for the aftermarket, but I suppose that it's a custom item or for an OEM who can order multiple sets.
Do you think the NorTech cat setup might work on other cats? I'd like to have it. Due |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
I have custom turndowns on my 50v with triple 6's, had to custom make them so they would fit between drives, etc, work awesome, would work on other cats if you have enough room to drop exhaust behind motor thru transom, the nortech cats have a ton of room in the engine compartment. I'm sure cmi will build you a custom set of tailpipes for the under water exhaust, but open your wallet.
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
wiggler,
Not so sure CMI is anymore expensive than others on downturns. What are you getting for a pair of your custom downturns? CMI maybe cheaper than you think. Rick |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Jim-
Do you have photos of your 50's exhaust? Thanks John |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
Originally Posted by wiggler4490
I have custom turndowns on my 50v with triple 6's, had to custom make them so they would fit between drives, etc, work awesome, would work on other cats if you have enough room to drop exhaust behind motor thru transom, the nortech cats have a ton of room in the engine compartment. I'm sure cmi will build you a custom set of tailpipes for the under water exhaust, but open your wallet.
I'd love to see some photo's also if you have them to share. thanks Cougarman |
Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
here is a pic of the first set before they were polished, as you c an see a standard cmi or gibson would not work on a triple 6 application, will take some pics of all 6 on after they were polished and finished, these were a custom o.d. , length and turn down depth.
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Re: Worlds QUIETEST 36 Nor-Tech!!!!!!!!!
I think ya forgot the picture :D :D
Cougarman |
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