LegoLord1880 Posted June 28 Posted June 28 Lately I've been working with poppet valve vacuum engines, which are interesting because of how much room for innovation there is. Today I built and tested a 3 valve head for one of my engines. It has one exhaust (fresh air) valve, and two intake (power) valves. I took tips for the head from the Cat D32 4 valve engine. The 3 valve head will make the engine run at around 1500 rpm, about 50% better than with its stock 2 valve head. Surprisingly, it's has about the same torque. I think this is because the engine has two intake valves to open. Any comments or suggestions for improvements will be greatly appreciated. I would also love to see someone use this to model International Harvester's gas-start Diesel engine, which was used in the Farmall MD tractor from 1941 to 1954. Pictures: https://bricksafe.com/pages/LegoLord1880/vvt-vacuum-engine/technic-starter-motor-prototype/kohler-k241-vacuum-engine-model/3-valve-vacuum-engine Inspiration: https://www.dieselworldmag.com/diesel-tractors/tractor-talk-1941-farmall-md-diesel-first-of-the-breed/ Quote
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