November 1, 2013,  Green Car Congress – In a paper presented at the recent Small Engine Technology Conference organized by JSAE and SAE International, Michael (Tony) Willcox from Pinnacle Engines reported that the 110cc version of the 4-stroke, spark-ignited (SI), opposed-piston, sleeve-valve architecture engine (earlier post) can use lean operation and ignition delay to meet Euro 4 NO_x emission targets without aftertreatment and with only a negligible impact (< 1.5%) on the fuel consumption benefits of the engine (about 25-27% better than a comparable conventional engine in the relevant drivecycle).

Further, Pinnacle noted, recently developed hardware designed for additional lean limit extension is under test. The new hardware is anticipated to leave margin with Euro 5/6 NO_x regulations using an oxidation-only catalyst for aftertreatment.

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