Build your own combustion engine with this fully working plastic model of a 4 stroke petrol car engine with ignition sound and illuminating spark plugsthe model engine is fun to put together and the haynes combustion engine kit contains everything you need the model engine is transparent meaning the workings of the combustion engine can be seen quite clearly it takes time to build but you039ll get a real sense of achievement once you see it workingover 100 parts to assemble and its very