| 1/5 scale cars normally use 2stroke petrol (24-26cc) engines, similiair is used in strimmers adn lawnmowers, however they also have disc brakes, on all 4 wheels in soem cases. there will be a fair bit of weight and it will take considerable effort to stop or even slow something of that size.But you are talking of using 8mm tube steel which will be very very strong but also heavy. you may be cheaper in teh long run to go on the larger engine route.
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