New Advertiser - K&B Supply - Gas Exhaust Silencers

[Jimmy Buoy]

With this product you don’t have to modify your boat so it makes it very easy to install or uninstall them.

"Easy to install"? I tried briefly to remove the rubber exhaust hose from the engine's riser and it's really really stuck! They have only been on there a little more than a year too. Mind you, this was during the winter and even though it's inside, the temps were still around 40. What's the trick to removing exhaust hoses?

Also, the storage shop's mechanic cautioned me that I'd lose quite a bit of WOT RPM's with the silencer's exhaust flow restriction since my 496's really like to exhale freely. Kinda gave me pause...

I've run into some prop issues (they are out being dialed in at the present), so I don't want more than one performance variable done at a time. Once I know what the engine's normal performance is with the props I will then look at doing this "EASY" install - that is, if someone wants to share how to make it easy.

Sorry guys - no feedback till then!

 

[Jimmy Buoy]

OK - The silencers are now installed (for the 2nd time):smt013

After having some degree of difficulty getting in touch with K&B with additional questions, I finally got to speak with Dan last week. :smt038

The first installation I did about a week ago was not fully successful:smt009. Exhaust noise was absolutely reduced BUT I found that both engines were stumbling at idle. I could hear some missing, I could see it on the wavering sync gauge, and I could hear one transmission chattering at idle speeds from the low or varying idle. The smell of raw gas was also noticeable - all previously not evident. :smt089

I then removed the silencers :smt017 and the engines went back to idling properly so I was considering returning the 4 silencers for a full refund as promised. :smt100

One more try contacting K&B! :smt014Dan happened to answer the phone number listed on the CSR Ad this time and when I informed him of my issues, asked how far his product was from the tip of the engine's risers. "About 1/2 inch", I replied. There was no additional room from the riser to the 90 degree fibreglass bend and tube to the water lift mufflers - there was just enough room and that was it. Dan said that was the problem. The Silencers were much too close to the exhaust risers and water was spashing back into the exhaust manifold at idle. The silencers must be further away from the risers.:smt115

The only other area in the exhaust lines with a 4" rubber hose was where the two fibreglass tubes connect to each water lift muffler. I had to cut about 4" off the fibreglass tubes to make room for the silencers, but they went in fairly easily.:thumbsup:

The results. PERFECT. :wink:Idle showed no signs of stumbling even while in gear (while tied to the dock). Thru-Hulls were even quieter than after the first installation. A quick sea trial resulted in the same degree of noise reduction as with the first attemped installation and the same 50-70 RPM loss at WOT. (minimal in my opinion)

Looks like I've now got the product doing what it claims to do! I'll be monitoring the engines for the next while just to make sure there aren't any other glitches - but confidence is high! :grin:

Sorry - No Video - No db Meter, just me and two other fellow boaters that all say the sound reduction is real and substantial. Thanks Dan!

 

[trit21]

So if you have an RPM loss doesn't that mean you are getting worse fuel mileage or using more fuel to push the boat as before without the silencers? Wouldn't that also mean you are creating more back pressure?

 

[Jimmy Buoy]

I agree! There will be more back pressure with the silencer installed. The question is how much? If my WOT was 4470 and is now 4415 that is only a difference of 1.2% which is acceptable in my opinion. It is also safe to assume that at any speed, this restriction will also have a negative effect on fuel consumption - again though, minimal.

Most likely your own car whatever the model, would benefit from a free flow exhaust system (more power, higher top speed, better fuel economy) since auto manufacturers put a more restrictive system on the car to reduce exhaust noise. Why haven't we all ditched the stock exhaust then??? We don't really want the noise - that's why.

In my case, I am simply willing to pay an apparently small price for a considerable increase in cruising comfort.

 

[trit21]

Actually we haven't ditched the stock exhaust systems on cars because it is illegal to do so I believe, noise ordinances and pollution control devises are in the exhaust I thought making it illegal to remove such devices. Cars and boats are totally different devices. Cars will cruise at 1800-2000 rpm getting 30mpg at 80 MPH. Your boat has to make alot of power to push all the water along to cruise. Marine engines work HARD to cruise while cars engines do not work nearly as hard. By restricting exhaust output, you are limiting your engine output thereby making your engine work harder to push the same amount of water and cruise at the same speed.

 

[GDDMD]

I have a bravo III on a Sea Ray 230 bowrider, the engine has 320 HP. Will the angled tubes with the built in muffer work , fit, and be affective on my boat?

 

[Jimmy Buoy]

I have a bravo III on a Sea Ray 230 bowrider, the engine has 320 HP. Will the angled tubes with the built in muffer work , fit, and be affective on my boat?

I don't think there is any free space in your exhaust system to fit the mufflers (assuming you have "through hub exhaust" vs "through hull exhaust).

 

[GDDMD]

We already build a stainless steel replacement elbow for the Merc engines, so all we do, is put our muffling components into the elbow, and it should give the same results as an inboard application. With our EST muffling components in the elbows they will cost $138/pr.

As for the generator muffler, it really doesn't matter where you install it. The only stipulation is that you will need around 10" of rubber hose some place between the generator and the exhaust port. With the Kohler 5E you should be able to install it between the genset and the water lift muffler.

Dan,
Tried to reach you or your company about these SS elbows for mercruiser with built in silencers for $138, but getting no response. Are you still in business. Do you still build and sell these silencer components for mercruiser bravo III 5.7 v8 engine in a sea ray 230 yr 2003? If so, please respond, as I have about given up on being able to reach kb performance at all! I will buy them immediately, if they are still available as advertised.

Mike (GDDMD)

 

[Jimr810]

I would like to introduce myself my name is Dan and I am the owner of K&B Supply and K&B Performance Marine exhaust products. I have been building products for the boat builders for 10 years+ and I have recently started K&B Supply to get our products out to the retail market direct from the factory, which will give you, the retail customer the ability to buy OE components at a discounted price. We have primarily been in the Tournament ski boat market and the day cruiser market for many years supplying marine mufflers and exhaust diverters to most of the boat builders around the world. I joined this site to promote our products and help any of you with your exhaust problems, or if you simple have a question I am here to help.

We have been running ads on this board for a few months now and I would like to talk a little about this product. It is a very unique silencer because it is very small but very effective. For all of you that have the older or newer style Sea Rays or any boat that exhausts out the side, our In-Tube silencer can dramatically reduce your cruising noise and idle noise without hindering the performance of your boat. The best part about our In-Tube’s is that they are simple to install. Now this product is designed for gas engines only, but we are working on some diesel applications that should be ready for market in the next few months. All you have to do is remove the rubber hose between the engine exhaust riser coming of the manifold and the Y elbow going down to the water lift muffler and slid our In-tube into the rubber hose and reattach your hoses back to the riser and the Y pipe. That all you have to do, and you are ready to go boating. Very, Very, simple, and you don’t have to cut anything, drill any holes, or remove any old exhaust components from your boat. Can’t get any simpler. The one thing about all of our products is that we try to make them all user friendly. So if you have any questions feel free to ask, I am here to help. For any of you that are looking for an exhaust diverter system we do have OE systems for the Patchanga 22s, 23, 24, & 25, the 270 SD, the 290SD, and the 300LX. I look forward to hearing from all of you.

Thanks
Dan


Check us out at: www.knbsupply.com

Dan, I have a 2005 Mastercraft PS 197 with the Indmar MCX engine. I'd like it to be even quieter since I ski on a public lake early in the morning. Will the K&B silencers fit?
Jim

 

[Summer Fun II]

Jim, I wouldn't hold your breath waiting for a answer.

kbperformace : Last Activity 01-22-2010 12:34 PM

PS, Welcome to CSR. :smt001