knock combustion vibration sensor

Engine knock isn’t just a noise problem. It’s pressure spikes that can crack pistons and erode cylinder heads. Vibration-based knock detection remains the most cost-effective way to monitor this phenomenon, and the sensor is the front line. Kingmach designs its knock combustion vibration sensors around a central trade-off: sensitivity versus robustness. A sensor that’s too sensitive picks up valve clatter and injector noise; one that’s too rugged might miss light knock. Our approach uses a single-ended compression design with a piezoelectric crystal stack, preloaded to a repeatable torque. This gives a near-linear charge output over a wide dynamic range, typically from a few milli-g to several hundred g. The frequency response is tailored to the 5–15 kHz band where knock energy concentrates, with a resonant peak placed above 20 kHz to keep the passband flat. Housings are stainless steel or hard-anodized aluminum, depending on the model, with IP67 sealing as a baseline. Mounting options include through-bolt, stud, and custom flange adapters. Electrical connections can be two-wire IEPE (integrated electronics) or charge-mode with high-temperature hardline cables for exhaust-side installations. Beyond the hardware, Kingmach supports integration from the start. Our application engineers can review your engine’s knock signature and recommend sensor placement, cable routing, and signal conditioning. If your monitoring system requires a specific sensitivity or connector pinout, we handle small-batch customization without the typical NRE shock. With distribution partners in over 30 countries and a technical support team that answers inquiries within one business day, we make sure the sensor isn’t the bottleneck in your test program. Whether you’re running durability tests on a new engine design or maintaining a fleet of stationary gas engines, the right knock sensor helps you sleep better.