Yamaha Rhino Noise
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Ways to Quiet Down a Yamaha RhinoThe Yamaha Rhino is a very popular side by side vehicle! Many people are the proud owners of these fine machines; however, some people would prefer their vehicle to be a bit quieter. One of the first reactions that people can have is simply that the exhaust is too noisy. If someone just modifies the exhaust, then they will likely be disappointed that their Yamaha Rhino is still noisy. It's not that modifying the exhaust is not helpful (it does help a lot), BUT it is just the fact that the noise on the Yamaha Rhino is like an orchestra - with many different "instruments" contributing to the sound that actually reaches your ears.
Yamaha Rhino Benz Add On Exhaust
As mentioned, quieting down the exhaust does help a lot. So, if you are looking to silence your Yamaha Rhino further, then the exhaust is a good place to start. The Benz Silent Rider exhaust does a good job of reducing exhaust noise. The stock muffler is not removed. This "add on" muffler simply attaches to the outlet of the stock exhaust to quiet things down further. It is a glass pack muffler that absorbs some additional noise. It does a good job. The Benz exhaust for the Rhino is available to buy with an optional bolt on adapter that simply bolts on using 3 bolts where the spark arrestor attaches to the rear of the stock muffler. You can order this silencer directly from Benz (1-888-EXHAUST). The Yamaha Rhino Benz exhaust can be installed with the factory spark arrestor or without - whatever you prefer. The Benz probably cuts down the exhaust roar by around 50%; however, keep in mind that that doesn't mean that your Rhino will be very quiet. There are also other products and other ways to quiet down your exhaust. Just remember, there are other sources of noise that need to be addressed on the Yamaha Rhino.
Yamaha Rhino Snorkel Attached to Air Box
Another source of noise on the Yamaha Rhino is the engine air intake. People may be surprised to know how much noise the suction side of an engine can really produce. In fact, most people probably mistake the intake roar to be a part of the exhaust noise. Things really start to get loud when you floor the gas pedal and give it full throttle for an extended period of time. Just putzing around at slower speeds may not be so bad. But, you will really notice more of the intake roar under full throttle acceleration. To make matters worse, the Yamaha Rhino was designed with the air intake right on the center console near the ears of both driver and passenger. Things can get really ugly (noisy) if you add a cab enclosure! That's where the idea of a snorkel comes into play. You will notice in the picture above that a flexible snorkel hose was clamped to the inlet of the stock air box, and the snorkel is routed up under the hood. This particular 2.5" inside diameter flex hose was purchased through McMASTER-CARR (562-463-4277), and it is listed in their catalog as: Flame-Retardant Blended Plastic/Rubber Duct Hose 2.5" ID (Part # 5475K17). Flexible duct hose can also be purchased from other companies of your choice. The machine shown in the picture above is a Yamaha Rhino 450. The 660 should be very similar, but regardless of what model you have, you will need to measure to make sure everything will fit properly.
Sound Foam on the Front of the Cargo Bed
At this point, if you have added the extra exhaust silencer and an intake snorkel, then you will find that you Yamaha Rhino is definitely quieter. Depending on what a person wants, it still might not be as quiet as some people prefer. Once again, it's simply that there are other "musicians" in this "orchestra of noise" that can be quieted down. You will find that there are vibrations generated by the Yamaha Rhino engine that are transmitted to other areas and can generate a lot of additional vibration noise. Sheet metal can be especially bad in generating annoying noises when it vibrates. The front of the cargo bed is made of thin sheet metal and if you hit this area of the bed, you can easily hear how it vibrates. It's close vicinity to the engine makes this large section of sheet metal prone to vibrating and being noisy. One way of trying to minimize this is to attach some sound deadening or abosrbing material to the front of the cargo bed as shown above. What you see in the picture is 1/4" thick closed cell foam which has a strong self adhesive sticky backing. This Super Soundproofing Mat was purchased from Super Soundproofing Company (760-752-3030). Thicknesses of 1/4" or 3/8" would probably work well for this purpose. Just clean the sheet metal, trim the sound foam to size, peel off the paper backing, and carefully stick it in place. This helps to deaden some of the sound that vibrates and reflects off that large sheet metal surface. There are other companies that also sell sound deadening foam and mats for this purpose.
As a general rule, if you want to find areas that might be prone to vibrating and being noisy, just go around tapping on suspected areas and see how they sound. If you hear a dull "thud" and there isn't much accompanying vibration, then move along and check other areas. If you hit an area and there is an ongoing vibrating/echo sound, then you know that might be a potential area for applying some sound deadening material to suppress the vibrations. Another piece of sheet metal that can be a source of noise is the aluminum heat shield that is between the muffler and bottom of the cargo box. This heat shield can be removed and on the underside a section of dynamat (or other heat resistant, foil lined sound deadener sheeting) can be applied. You might also consider adding a strip of the sound deadener between where the heat shield and chassis rails touch. Even though there are bolts that attach the heat shield to the chassis in these areas, there can be a gap in places between the aluminum shield and chassis that might be an opportunity for a rattle.
Yamaha Rhino Sound Absorbing Blanket
If you really want to try to go the extra mile to quiet down your Yamaha Rhino, then it is possible to go further by adding more sound absorbing material in different areas. If you can absorb more of the noise closer to the engine, then you can try to prevent the sound energy (and vibrations) from being transmitted through other parts of the Rhino and resulting in more vibration and rattle sounds. The picture above shows a custom sound absorbing blanket with a fiberglass core that was draped over the engine and fits under the plastic engine cover. This custom size sound blanket was also ordered from McMASTER-CARR and is listed in their catalog as: Acoustical Fiberglass Absorbers - 1" Thick Double Faced Fiberglass (Part # 9781T83). You specify the exact size that you want made, and it takes a few weeks to get it. An otherwise stock Yamaha Rhino would not be able to have a blanket sitting like this, because it would block the factory air box inlet. This is not an issue on this particular Yamaha Rhino, because the air intake is snorkeled to under the hood. This sound absorbing blanket sits over the top of the snorkel. This custom sound blanket might be more than most people want to do to their Yamaha Rhino, but it helps quiet things down even further.
If you really like your Yamaha Rhino but wish it was quieter, then these are some ideas to help accomplish this purpose. Of course, you can also just buy a pair of cheap foam ear plugs and block out the sound that you hear. That can be a lot cheaper and easier! However, if you don't always want to have to wear ear protection, and if you like to drive with a passenger and talk (and not have to yell at each other over the noise), then you might want to consider doing some more work to reduce the noise closer to its source. Also, if you use your side by side for hunting, then you probably want your Yamaha Rhino to be quieter and more stealthy. It's pretty hard to stuff ear plugs in the animals that you are hunting, so they don't hear you driving up! Whatever the reason, if you are the type of person that wants a quieter side by side, then some of these ideas can help make a significant difference in reducing the overall noise of your Yamaha Rhino.