Lionel Leigo Posted over 2 years ago can we increase revolution of 4 stroke petrol engine.....by help of gears...? eerrr, friction, tourqe loss, space required, weight making it all null and void fairly quick... I must admit that i like the way you think, but..... y'know its all been thought of already. You should take a look at a cummins or detroit, or a cat engine from a truck mate, similar, but balanced to deliver without the overweight. Kinda like there is no reason to put a gokart motor in a bulldozer and the other way round too. Currently I am working on a vertical wind turbine, which will be coupled to a matched flywheel, which will in turn drive other things such as an air compressor, which will........ run a submersible bore pump..............maybe?