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Midget racecars were at one time the most popular form of auto racing in the U.S. Midget auto racing dates back to the early 1930's and exist today in the United States, Canada Australia, and New Zealand. As its name might imply, a Three Quarter Midget is a scales down version of a "full" midget racecar. 750 cc motorcycle engines power most TQ's. Starters and transmissions are prohibited so the portion of the engine case that housed the transmission is machined off and the engine crankshaft is direct coupled to an enclosed driveshaft. TQ's are either in or out of gear meaning that there is no clutch to transmit power . Because of this TQ's have to be push started on the track with the car in gear in order to get the engine to turn over and fire. The engine power is transmitted to an open axle through quick-change rear housing. Quick change means that the rear drive ratio can be quickly changed by removing the cover and changing an intermediate gear set between the driveshaft and the ring and pinion. Most TQ's use methanol for fuel and can utilize either fuel injection or carburetion for delivery. The chassis frame on a TQ is constructed from aircraft grade chromoly tubing. All cars must meet minimum safety standards on construction and materials used. Below is a comparison between a Three Quarter Midget and "Full" Midget. |
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