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Full-expander cycle (and not open expander) with methalox can reach about 370s isp in vacuum with practical nozzles, IHI and JAXA have recently tested a compact 30kN engine of such performance, KBKhA have also done similar tests iirc.source: Research and Development of the Small LOX/Methane Propulsion System for an Experimental Reusable Winged Rocket WIRES#015, 2023Component tests of a LOX/methane full-expander cycle rocket engine: Single-shaft LOX/methane turbopump, 2019Other Full-expander engines, such as Avio's M10 and KBKhA's Methane-ran RD-0146 could also reach in the 360s range
Full-expander cycle (and not open expander) with methalox can reach about 370s isp in vacuum with practical nozzles, IHI and JAXA have recently tested a compact 30kN engine of such performance, KBKhA have also done similar tests iirc.
source: Research and Development of the Small LOX/Methane Propulsion System for an Experimental Reusable Winged Rocket WIRES#015, 2023
Component tests of a LOX/methane full-expander cycle rocket engine: Single-shaft LOX/methane turbopump, 2019
Other Full-expander engines, such as Avio's M10 and KBKhA's Methane-ran RD-0146 could also reach in the 360s range
