I can't call you a child at all..
I built a mostly billet 3.3 nitro engine for my Traxxas Revo and was easily exceeding 50,000rpm with it before I blew it in to about 14 pieces. Billet crankshaft, billet H-beam rod, billet piston, heavily modified sleeve to adjust port timing, billet head, ceramic high speed crank bearings, etc..
The Revo is the most advanced RC model in history as far as suspension design. It was worlds above anything else on the market at the time, and still is really. Mine would do 360 flips from a stand still and move no further than a few feet in the process. Wheelies at 40+ mph on demand. 65+ mph top speed, 2 gears, with brakes. I jumped my friends 2 story house with it once, and cleared the roof easily. lol
Traxxas TRX 3.3 Pullstart 1.06 @ 31,250 rpm 37.49 oz-in @ 19,500 rpm 37,750 rpm w/ kit
The drawback is the $$$$$ you sink in to them, but they stay fun for far longer imo. The crawlers and scale stuff gets boring fast to me. I built a tube chassis buggy with Clodbuster axles and lathe motors and it was strong enough to pull me if enough weight was applied to it. It would break your fingers if you got them caught around the tires.
Custom 4 link, trimmed tires, 4 wheel steering with self-centering rear steer, billet hardened axle shafts and gears, lathe motors, custom aluminum suspension links and servo mounts, etc.. The thing would climb any obstacle known to man.
I later sold it for $750 on Ebay.