LegoLord1880 Posted 17 hours ago Posted 17 hours ago 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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