https://www.just-auto.com/news/mahle-addresses-downsized-engine-durability-issues_id177077.aspxFrom above linkMahle addresses downsized engine durability issues
Engine component specialist Mahle says that its engineers are working to overcome challenges presented by high levels of low-speed torque in small engines. In particular, it says that 'low speed pre-ignition' can damage piston rings and other engine components...
Engineers at Mahle are developing solutions to help improve the performance and durability of components such as pistons and piston rings for this new generation of engines.
"Mahle Group is at the forefront of research on LSPI-related problems," Wagenblast adds. "Our development teams are focused on creating engine components and systems designed to withstand low-speed pre-ignition events, as well as assist in preventing their occurrence."
Mahle research engineers in Farmington Hills and Stuttgart have been actively working on understanding and finding solutions to LSPI-related problems for several years. Lab-based ring testing helps with the understanding of LSPI occurrences and effects. The knowledge gained is being used to refine simulation techniques and enable Mahle to design more robust components. For example, incorporating a high-strength ring carrier in a piston's first ring groove has been shown to avoid piston land breakage which is a common issue with LSPI, the company says.
Engine-based testing also is used to validate component designs and rank these designs based on robustness to LSPI events. Mahle uses a robustness test that induces LSPI on a turbocharged direct-injection engine. Low-speed pre-ignition can damage piston ring running surfaces and coatings that potentially affect long-term oil consumption, blowby and durability, and also increase OEM warranty costs.
"Having the ability to rank ring coatings has already proved useful in recommending technology to customers that experience LSPI in their engine development programs," Wagenblast says.