World's smallest supercharged four-stroke V8 engine now in production The Conley Stinger 609 supercharged four-cycle V8 gasoline engine - 6.09 cubic inches and 9.5 horsepower at 10,000 rpm (Photo: Conley Precision Engines) Via Gizmag
Giant-scale model cars (and airplanes) powered by small gasoline engines have been popular with adult racers for quite a few years now. The largest scale models available through conventional RC hobby outlets are one-fifth or one-sixth scale, but the serious racers go quarter-scale. Now the smallest (quarter-scale) blown V8 gasoline engine in commercial production is being turned out by Conley Precision Engines to power.A quarter-scale gasoline-powered car is about 1.2 m (4 feet) in length, weighs around 50 kg (110 lbs), and can top out at over 160 kph (100 mph). The engines for such large models are usually two-cycle engines not dissimilar from the engines that power weedwackers and leaf blowers, typically beginning at about 33 cc (2.0 cu. in.) displacement, providing 3 to 4 hp at 6-8000 rpm.Even the larger engines for quarter scale models are simple and relatively inexpensive. For example, a 160 cc (10 cu. in.) displacement gasoline motor that provides 17 hp at 9000 rpm while weighing only 4 kg (8.8 lbs) is available for about US$1000. (I did say relatively inexpensive). This is plenty of power for any quarter-scale wheeled vehicle one might want to race.