# Russian internal combustion engine patent developments > Live situation record from CLSTR: https://clstr.news/situations/russian-internal-combustion-engine-patent-developments > Updated: 2026-09-26T23:35:07.000Z. Sources: 8. Developments: 2. Recent developments in Russian engineering have seen the patenting of two distinct internal combustion engine designs aimed at improving versatility and efficiency. In mid-September, Valery Borovskikh was granted a patent for a multi-fuel engine capable of operating on gasoline, diesel, and gas without modification. The design uses an electronically controlled valve to pump hot exhaust gases from a previous cycle into a small secondary chamber to initiate ignition. This method aims to reduce nitrogen oxides and soot by maintaining peak cycle temperatures below 2000°C. Following this, engineer Vladimir Mikhailov received a patent for a closed-cycle engine designed to reuse all exhaust gases. This system cools, filters, and recombines exhaust with oxygen and new fuel to return it to the combustion chamber. This closed-loop approach is intended to retain thermal energy, increase thermal efficiency, and reduce fuel consumption. ## Timeline ### 2026-09-26: Geran-5 drones pose new threat to Ukraine with advanced navigation Russia's new jet-powered Geran-5 drones, featuring advanced electro-optical navigation, are challenging Ukrainian air defenses with higher speeds and increased resistance to jamming. 8 sources. https://clstr.news/cluster/russian-engineer-patents-closed-cycle-exhaust-recycling-engine ### 2026-09-19: Engineer Valery Borovskikh patents multi-fuel engine Russian engineer Valery Borovskikh has patented a multi-fuel internal combustion engine that can run on gasoline, diesel, or gas by using recycled hot gases to trigger ignition. 2 sources. https://clstr.news/cluster/engineer-valery-borovskikh-patents-multi-fuel-engine --- Cite as: Russian internal combustion engine patent developments. CLSTR, https://clstr.news/situations/russian-internal-combustion-engine-patent-developments