Riley Turbostream / Super 310/320
Jack Riley produced variants of the Cessna 310 to improve performance. The Riley Rocket 310 and the Riley Turbostream 310 replaced the standard Continental 310 hp (230 kW) engines with Lycoming TIO-540 350 hp (261 kW) engines. These turbocharged intercooled engines were installed with three-blade Hartzell propellers in a counter-rotating configuration to further increase performance and single-engine safety. At 5,400 lb (2,400 kg) gross weight the aircraft had a weight to power ratio of 7.71 lb (3.50 kg) per horsepower. This resulted in a cruising speed of 260 knots (480 km/h) at 18,000 feet (5,500 m) and a 3,000fpm rate of climb.
The Riley 65 and Riley Super 310 conversions used Continental engines.
Cessna 310 to 310G by fitting two 240-260 hp (179–194 kW) Continental O-470D/-470M engines.
Riley Super 310
Conversion of Cessna 310/320 by fitting two 310 hp (231 kW) Continental TSIO-520-J/-N engines.
Conversion of Cessna 310 by fitting two 350 hp Lycoming engines.
Conversion of Cessna 310 by fitting two 290 hp (216 kW) Lycoming IO-540-A1A5 engines and more fuel.
Riley Super Turbostream / Cessna 310/320