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A higher power 7-HP model was made (Engine Model# 84330) for use in heavier duty machines such as the single stage Snow Commander (2001–2008) and 2 stage Power Max 726TE/6000 (2004–2008); the extra horsepower was obtained using transfer ports in the piston and cylinder wall, and this model ran at the same operating speed as the 6.5 hp ...
The engine is a V-twin four-stroke, 895 cc (54.6 cu in) or 993 cc (60.6 cu in) displacement, fan-driven air-cooled, gasoline engine design. The larger displacement is achieved by increasing the stroke from 78 to 87 mm (3.1 to 3.4 in), but using the same bore of 86 mm (3.4 in).
The Briggs & Stratton BlockZilla motor is a more advanced form of the earlier Raptor motor. The block is built up to handle more power. This means that the block is about 6 lb (2.7 kg) heavier and has much more structural integrity. Also the exhaust and intake ports are set on an angle.
In 2000, a Hungarian manufacturing facility was opened with expanded capacity for electrical products. MTD acquired Ryobi Limited's North America outdoor products business, giving them the capacity to produce 1.5 million engines and related hand-held garden products. In 2001, MTD acquired Garden Way including the Troy-Bilt and Bolens brands.
The fresh air and most of the leftover fuel and exhaust leave the cylinder. Anil claims that this creates a fresher atmosphere inside the cylinder before the next air-fuel intake stroke, helps the engine to burn almost 100% of the air-fuel mixture, and reduces harmful emissions (including a 98% reduction in carbon monoxide emissions).
The fuel being injected was described as being in vapour phase having been heated by the engine cylinder. The pressure of the fuel was regulated at the fuel pump, and the amount of fuel admitted was controlled by mechanical means at the rotary admission valve. It seems this radical design wasn't taken further by F. E. Baker.