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  • Exhaust back-pressure has confused me for a long time. This post . . .
    When the exhaust valve cracks open it sends a sudden pressure pulse of positive pressure out into the header When that positive pressure finds an abrupt expansion (like the collector, the H pipe or a muffler) it sends a negative (suction) pulse back These pulses travel at the local speed of sound
  • Understanding Automotive Exhaust Noise: Pulsating and Flow Noise
    Flow noise arises when exhaust gases flow turbulently through the exhaust system and during their exit It can have a broad spectrum or tonality depending on how it is generated Tonal flow noise with a specific frequency occurs when the gas stream encounters an obstacle, creating swirling vortices
  • Exhaust Flow | Exhaust Tuning | Performance Muffler - Engine Basics
    If the exhaust pressure pulses interfere with each other, the exhaust flow is slowed, causing a decrease in volumetric efficiency (and thus decrease in horsepower) Proper exhaust manifold header tuning actually creates a vacuum, which helps to draw exhaust out of the cylinders and improve volumetric efficiency, resulting in an increase in
  • Time delay through the exhaust system - pressure pulses
    The left-hand vertical ruler (below) marks a missing exhaust pulse in the blue trace, as detected at the start of the downpipe; the right-hand vertical ruler marks the corresponding point in the trace (red) at the tailpipe The time lag is 12ms, which corresponds to 82 degrees of rotation at 1150RPM on a warm (57C) engine
  • Analysis of Engine Exhaust Pressure Wave Performance - Synergy Publishing
    Due to the intermittent opening and closing of the exhaust door of the engine, the high temperature and high pressure exhaust from the cylinder is transmitted along the exhaust pipe in the form of compression wave pulse
  • Exhaust pulses explained
    The pressure pulse therefore not only hits the turbine, but also spreads into other exhaust gas pipes I therefore lose energy This method is called constant-pressure turbocharging: I pump everything together into a large vessel from which the collected exhaust gas passes over the turbine
  • The Exhaust Scavenging Effect - Low Offset
    It is this negative pressure wave that helps to draw the next exhaust pulse behind it (like a vacuum), and the cycle keeps going This is referred to as scavenging The faster these exhaust fumes leave the engine (exhaust velocity), the more efficient the scavenging process will be
  • Numerical Analysis of Engine Exhaust Flow Parameters for . . . - MDPI
    Energy carried by engine exhaust pulses is critical to the performance of a turbine or any other exhaust energy recovery system Enthalpy and exergy are commonly used concepts to describe the energy transport by the flow based on the first and second laws of thermodynamics
  • - Exhaust System Technology- - IDC-Online
    The instantaneous velocity of the exhaust gas flow at any point is determined by the pressure gradient and the cross-sectional area at that point In the header, a smaller tube diameter will increase the velocity at a given RPM, which might enhance the pressure wave tuning (the second component) and can be beneficial with regard to inertia effects
  • Exhaust Back Pressure: How to Get It Right - Holley Motor Life
    There’s a change in pressure between the exhaust pulses; ideally, you’ll have a low-pressure area between one exhaust pulse and the next And when you have that low pressure area between the pulses, it helps pull the next ball of exhaust gas out, which means the engine doesn’t have to do extra work to push those exhaust gases out





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