LegoLord1880 Posted March 18 Posted March 18 I've always wanted to build a reversable vacuum engine, but I could never shrink down a valve gear mechanism. I also thought it would be nice to have VVT for higher speeds. Eventually I thought of using a differential to do both jobs. The engine's crankshaft drives one of the differential's outputs to spin the case. The other differential output is held in place by a worm gear. Spinning the output to turn the differential case makes a 2:1 reduction, so I attached a chain from the 24t end of the differential to a 12t spur gear to get the ratio back to 1:1. This engine runs very smooth. I can advance or delay the valve timing in small increments by turning the worm gear, or reverse the engine by advancing the timing by 180 degrees. I hope someone puts this mechanism to use! https://bricksafe.com/pages/LegoLord1880/vvt-vacuum-engine Quote
engine1ear Posted August 26 Posted August 26 This is awesome! I just talked about this idea with a friend last week and now here I find out it's been done! Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.