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Liqui Moly releases additive to combat low speed pre-ignition

Nov. 3, 2020
DIJectron is suitable for all vehicles with a 4-stroke gasoline engine, especially for direct injectors but also for vehicles with intake-manifold injection.

Liqui Moly has developed DIJectron, an additive that significantly reduces the risk of low speed pre-ignition (LSPI). More and more modern engines are at increased risk from LSPI, the company says. Similar to classic engine knocking, this can lead to serious engine damage.

Modern, high-performance engines with direct injection suffer from an increased risk of premature ignition at low engine speeds (LSPI – low-speed pre-ignition), the company says. Here the gasoline/air mixture ignites spontaneously in the combustion chamber before the ignition spark is created. This knocking can cause serious engine damage. The contamination inside the engine certainly plays a role.

Liqui Moly's DIJectron contains polyetheramine (PEA) as an active ingredient. “Active PEA is a highly effective cleaning chemical that removes even stubborn deposits from injectors, pistons, and combustion chambers,” said David Kaiser, head of research and development at Liqui Moly. “And, if used regularly, it provides lasting protection against new carbon deposits.”

These deposits are considered an essential factor for LSPI. Modern direct-injection turbocharged gasoline engines have a highly stressed injection system. The injection nozzles reach directly into the combustion chamber and are therefore exposed to high temperatures, pressures, and the influence of combustion residues. Deposits form at the nozzle outlet openings within a short time, ensuring that the gasoline is no longer atomized so finely. This worsens the emission values and increases the fuel consumption. The deposits can begin to glow due to the high temperatures, which can then lead to LSPI.

DIJectron can be used at any inspection. It only has to be added every 2,400 miles. It is suitable for all vehicles with a 4-stroke gasoline engine, especially for direct injectors but also for vehicles with intake-manifold injection.