� Frequency: 3 to 25 kHz

� Weight: 48 g

� Height sensor head: 18 mm

This sensor is used for detecting structural born vi-brations in spark ignition engines due to uncon-trolled combustion. This sensor is suitable for opera-tion in extreme conditions.Due to the inertia of the seismic mass, the sensormoves in correlation to the engine block vibration;this motion results in a compressive force which isconverted into a voltage signal via a piezoceramicsensor element. As a result, upper and lower voltagethresholds can be defined directly correlating to anacceleration magnitude.The main benefits of this sensor are its robust mech-anical design, compact housing and precise determ-ination of structure-related noise. The small pack-aging is accomplished by integrating the connectordirectly to the sensor.

Application

Application 3 to 25 kHzOperating temperature range -40 to 150°CStorage temperature range -30 to 60°CMax. vibration ≤ 800 m/s2

Technical Specifications

Mechanical Data

Male thread (for cast) M8x25Male thread (for AI) M8x30Installation torque 20±5 NmWeight w/o wire 48 gProtection IP X9K

Electrical Data

Range of frequency 3 to 25 kHzSensitivity at 5 kHz 26 ± 8 mV/gMax. sensitivity changing (life-time)

-17 %

Linearity between 5 to 15 kHz(from 5 kHz value)

-10 to 10 %

Linearity between 15 to 20kHz (linear increasing withfreq)

20 to 50 %

Main resonance frequency 30 kHzImpedance > 1 MOhmTemperature dependence ofsensitivity

0.04 mV/g°C

Capacity field 1,150 ± 200 pF

Connectors and Wires

Mating connector 2-pole 2-Pin RB-Kp.1 (F 02U B00966-01)

Or

2-Pin Jetronic (D 261 205288-01)

Pin 1 Sig+Pin 2 Sig-

Installation Notes

The KS4-P can be connected to all Bosch Motorsport ECUs fea-turing knock controlThe sensor must rest directly on the brass compression sleeveduring operation.

Bosch Motorsport | Knock Sensor KS4-P

Knock Sensor KS4-P

To ensure low-resonance coupling of the sensor to the measure-ment location, the contact surface must be clean and properlymachined to provide a secure flush mounting.Please route the sensor wire in a way that prevents resonance vi-bration.Please find further application hints in the offer drawing at ourhomepage.

Safety Note

The sensor is not intended to be used for safety related applica-tions without appropriate measures for signal validation in the ap-plication system.

Ordering Information

Knock Sensor KS4-PMating Connector: 2-Pin RB-Kp.1Order number 0 261 231 173

Knock Sensor KS4-PMating Connector: 2-Pin JetronicOrder number 0 261 231 188

Dimensions

Bosch Motorsport | Knock Sensor KS4-P 2 | 2

Represented by:

Europe:Bosch Engineering GmbHMotorsportRobert-Bosch-Allee 174232 AbstattGermanyTel.: +49 7062 911 9101Fax: +49 7062 911 79104motorsport@bosch.comwww.bosch-motorsport.de

North America:Bosch Engineering North AmericaMotorsport38000 Hills Tech DriveFarmington Hills, MI 48331-3417United States of AmericaTel.: +1 248 876 2977Fax: +1 248 876 7373motorsport@bosch.comwww.bosch-motorsport.com

Asia-Pacific:Bosch Engineering Japan K.K.Motorsport18F Queen’s Tower C, 2-3-5 MinatoMirai Nishi-ku, Yokohama-shiKanagawa 220-6218JapanTel.: +81 45 650 5610Fax: +81 45 650 5611www.bosch-motorsport.jp

Australia, New Zealand and SouthAfrica:Robert Bosch Pty. LtdMotorsport1555 Centre RoadClayton, Victoria, 3168AustraliaTel.: +61 (3) 9541 3901motor.sport@au.bosch.com

© Bosch Engineering GmbH 2020 | Data subject to change without notice51813003 | en, V, 12. Feb 2020