KnockLink G4 - visual detonation warning
Drive with peace of mind, knowing that your engine is operating safely when using the G4 KnockLink. The KnockLink will show the beginning detonation long before you hear it.
The G4 KnockLink is designed for both street and race use.
"Ignition timing can make or break an engine and the effects of too much timing or a bad batch of gas can really ruin your day.
The team at Link has been hard at work with knock detection devices and off the back of the G4 KnockBlock comes the G4 KnockLink.
The G4 KnockLink is a stand alone Knock Detection warning light that is simple to install and actually works. I was surprised at how well the KnockLink worked either with factory sensors or noisy engines - the KnockLink picked up detonation that if left alone would have destroyed an engine.
The KnockLink is perfect as a warning device in all cars for that peace of mind as well as a handy tuning tool."
Typical causes of engine knock:
Engine knock is one of the most damaging effects in any engine. Detonation (knock) can destroy your engine in seconds. You need to know when knock occurs, instantly. If knock does occur, the KnockLink warns the driver with a high intensity red flash.
Knock can happen when there is:
- Poor fuel quality
- Incorrectly rated spark plugs
- Engine cooling problems
- Engine management problems
What is Knock?
Knock, also known as detonation or “pinging”, refers to the spontaneous combustion of an air/fuel mixture inside the combustion chamber.
The self calibrating, G4 KnockLink will flash to warn the driver of any knock present.
Knocking is induced by excessive pressure within the combustion chamber causing the air/fuel mixture to self detonate. Excessive combustion pressures can be a result of increased engine temperature, high boost pressure, elevated inlet air temperature, lean mixture or over advanced ignition timing.
Tuning for performance and efficiency brings an engine nearer to the point of detonation. To achieve the maximum output and efficiency, combustion pressures must be optimised to create the greatest force on the top of the piston (or side of rotor). This combustion pressure is controlled by ignition timing and air to fuel mixture.
If the air/fuel charge detonates, a large pressure impulse is created vibrating the surrounding engine structure. The effects of the vibrations can cause cracked pistons, bent rods and damaged bearings. This gives the need to accurately detect engine knock.
The most common way of detecting engine knock is to bolt a piezoelectric vibration transducer (knock sensor) to the side of the engine block. The knock sensor behaves similarly to an audio microphone but converts vibrations rather than audio to an electric signal.
Why choose the KnockLink over other products on the market?
The KnockLink G4 is the only device on the market that requires no setup. Other systems require time consuming gain, frequency and noise settings to be adjusted. Without proper knock listening tools, this can prove difficult if not impossible. The KnockLink requires none of this, just wire in and start the engine.
Even light detonation will damage an engine over time. The G4 KnockLink's microprocessor continuously scans the knock signal and warns for any knock occurring. The engine's RPM and load is automatically 3D profiled by the KnockLink, continuously storing and dynamically adjusting this noise profile map while looking for the particular knock frequency.
The G4 KnockLink is the only self-calibrating ignition warning instrument on the market.
Connect to either your existing unused sensor or, preferably, add an additional sensor (sold separately).
"Great unit guys. Ran mine up today on the dyno and it picked some detonation up
that I didn't hear with my ear phones first time power run"
Mason Lockyer - Speedworks Dyno Tuning, Oct 21, 2011 (From Link ECU FaceBook)
How does the new KnockLink G4 compare to the old?
The old KnockLink was admittedly crude in its operation, the displayed value was proportional to engine noise and knock could be seen as an addition to this. The new KnockLink uses advanced signal processing techniques to determine actual engine knock, normal engine noise is completely discarded.
The new KnockLink is housed in an anodized black aluminum enclosure, providing sleek looks along with high durability... steps ahead of the old KnockLink.
- Intelligent self learning digital system.
- High detection accuracy (>90%).*
- No complicated calibration process.
- High intensity red warning flash.
* based on feedback from professional engine tuners
Operation is simple. The colour of the LED represents four different modes:
Dim Blue - KnockLink is powered, waiting for the engine to be started
Flashing Blue - KnockLink has detected the engine has started and is now calibrating
Dim Green - KnockLink is adapting to the engine's noise profile and listening for knock
Flashing Red - KnockLink has detected knock. Avoid large throttle openings, seek professional advice
Engine knock is one of the most damaging effects in any engine. The KnockLink warns the driver in the event of knock with a high intensity red flash.
Installation is simple and requires four wires to be connected - see the diagrams below.
Mount the sensor as close as possible to the centre of the engine block.
Red wire = Power Supply - connect to an ignition switched power supply. Make sure the power stays on to the KnockLink during starting.
Black wire = Power Ground - this wire can be grounded to the vehicle chassis.
Yellow wire = Sensor Signal - when using a two terminal knock sensor, this wire may be connected to either terminal. When using a single terminal sensor, connect to the only terminal.
Green wire = Sensor Signal Ground - when using a two terminal knock sensor, connect to the other terminal on the knock sensor. When using a single terminal knock sensor, connect to the engine block as close as practical to the knock sensor. An eye terminal under the knock sensor would be suitable.
- The yellow and green wire must use shielded cable from the KnockLink wiring harness to the knock sensor.
- The black wire on the KnockLink needs to be connected to a clean ground point on the engine block or vehicle chassis. Do no connect to a ground wire shared with another device.
• Knock sensor wiring needs to be routed away from ignition components and any noisy or high current wiring.
• Never share the knock sensor with the ECU.
• Not suitable for use on MECHANICALLY noisy engines. This includes engines with high clearance pistons and two-stroke engines.Other Notes:
- Some knock sensors are not suitable for use with the KnockLink. Some sensors have unusually low power outputs or impractical frequency ranges. Also, a knock sensor is typically selected for a particular engine block and may not be suitable for use on another engine block type. For these reasons, it is recommended that the KnockLink is used with the Bosch two wire "donut" style sensor (P/N 0 261 231 148). This sensor has measurement characteristics suitable for most engine blocks.
The KnockLink standard kit includes:
- G4 KnockLink with wiring loom
- Mounting bracket
- Installation guide
- Knock Sensor with a shielded loom.