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Performance - Low Back Pressure or Low Sound?
October 13th, 2008
Why choose when you can have BOTH!
 It the past OEMs had to sacrifice power in order to achieve lower sound emissions when using traditional muffler designs. With SES’ new patented design, OEMs can now have more power while maintaining existing or achieving lower sound levels
Back Pressure
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The article question172.htm” target=”_blank”>”How do exhaust headers work to improve engine performance?” at www.HowStuffWorks.com explains how back pressure effects performance;
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“During the exhaust stroke, a good way for an engine to lose power is through back pressure. The exhaust valve opens at the beginning of the exhaust stroke, and then the piston pushes the exhaust gases out of the cylinder. If there is any amount of resistance that the piston has to push against to force the exhaust gases out, power is wasted.“
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When tested, an SES muffler measures approximately half the maximum allowable back pressure of 40″H2O (40 inches of water or 1.5psi), required by most non-road engine manufacturers.
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Sound
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Sound is energy and a muffler needs to eliminate it. The best way to do this is with a silencer which consists of a large enclosed chamber (the larger the better). In order to achieve this a huge amount of space is required. Stationary applications can afford have a silencer that is larger than the engine itself but is not feasible for mobile equipment.
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 Sound cancellation and resonators are other techniques used to reduce sound. These techniques only work for specific frequencies at certain engine RPMs. Sound insulation (glass pack) is another technique but tends to deteriorate over time. Insulation increases the internal temperature of the muffler making it prone to backfire.
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 The only option left is back pressure which is used to muffle sound. Traditional designs use many different components such as baffles to make different chambers and tubes to create a maze in an effort to reduce sound. The only result of using these components is increased back pressure.
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SES’ design maximizes the volume of the muffler which results in lower back pressure.
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Other benefits include;
- More torque and power
- Less emissions
- Better fuel consumption
- Lower skin temperature
Conclusion
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SES’ unique muffler design out performs all other traditional muffler designs by reducing back pressure and lowering sound in the same amount of given space. What is even more amazing is that this is achieved by using 40% less components. While many of our competitors tend to refer to muffler design as a dark art, SES sees it as pure science.
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