Comments by "José Veinte Genario -NISU" (@joseveintegenario-nisu1928) on "Overcoming The Rotary Engine’s Biggest Flaw" video.

  1. The issue of materials in Wankel RCE seems totally solved today: Aluminum for housing; nikasil for working surface; ferrotic for apex seals, IKA for side seals. A three piece apex seal, as in Citroën patent GB143850, could help tightness. Iron for rotor, aluminum rotor if you need a reduced weight for racing the engine faster. Always add some oil mixed directly to fuel, 1 % is enough, oil pumps fail, this prevents engine destruction. Mazda had MoS2 added in the oil of Le Mans endurance and economy race winning Wankel. You could consider 1 cc LiquiMoly Molybdenum additive per litre of oil in gasoline mix. An 80 RON fuel is enough for a Wankel, a type of engine specially suitable to E5 or E10 ethanol in gasoline fuels. Source of emissions and losses in Wankel is leaks at low rpm, quenching, flame extinction at cold working chamber walls, at high rpm. A hotter rotor surface reduces HC emissions. Air cooled engines, working at an slightly higher temperature, had better SFC in the early Yanmar Diesel Wankel engines, SAE papers 710581 and 720466, downloadable form www.sae.org site, membership not required. The Small Wankel Engines by Sachs, from KM-37, KM 48, to KM-24, KC-27 and KM-914, all had same Rotor design and side seals, equal to the Aixro Wankel Kart and Ultralight Aircraft engines of today, just rotor width changed; with the wider rotors, a great improvement in SFC was seen. Port overlap was a big cause of emissions, fresh mix going through the exhaust port, burned gas entering intake stroke, Mazda fully solved the issue in the Renesis RX-8 engine, side intake and side exhaust ports, zero overlap. But perhaps it would be better having a Peripheral Port, NSU proved rectangular ports are better than round intake ports, fitted by a Reed-Valve, with Side exhaust ports, also zero overlap, for better BMEP. Toyota with an R-V controlled P-Port, a Glow Plug in leading plug site, and air injection in exhaust port, SAE paper 790435, had a 9 % fuel economy improvement. Kawasaki obtained improvements, patent US3848574, by adding an extension of plug hole, wedge shaped, pointing towards trailing side of Rotor. The video here 'Rotary engine breakthrough' https://youtu.be/m3pCLjHZmhM?si=-IVGs3VkqPJcXhrz obtained a noticeable reduction in Exhaust Gas temperature of Wankel, indicative of higher BMEP, higher actual Compression ratio, by changing the larger area round plug hole into an slot type of plug hole. Recent Aixro engines have the plug hole pointing towards Rotor trailing side. Small changes, big results!
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