What Causes Low-Speed Pre-Ignition (LSPI)?

LSPI most commonly occurs at low speeds during a period of rapid acceleration in turbocharged, downsized gasoline vehicles. A premature ignition in the combustion chamber, generated prior to the spark plug firing, causes an abnormal combustion and high cylinder pressure. The LSPI event results in a loud knocking sound from the uncontrolled pressure rise in the cylinder. In some cases, a single LSPI event is sufficient to cause severe engine damage. There are two potential drivers of LSPI:
 
Oil droplet induced pre-ignition
 
 
 
 
Combustion chamber deposit-initiated pre-ignition
 
 

We are committed to answering why LSPI occurs and providing solutions for our customers that help them and their customers meet performance expectations.

Afton has unmatched expertise across the breadth of engine oils, fuel additives and combustion. We have more than 90 years of engine-improving innovations and industry firsts, as well as state-of-the-art testing equipment and a team of pioneering chemists and engineers.

At the same time, Afton is leveraging its global relationships to complement its own internal R&D efforts. This includes collaborating with automakers and partnering with experts in industry and academia around the globe. For additional background information about LSPI, click here. 

Recently Published Insights