O’Donnell Super Sport .21 Engine

Designed in the USA by master engine tuner Steve O’Donnell, the Super Sport .21 is the pinnacle of 1/8 scale nitro racing. It’s a shining example of the “clean sheet” concept – a fresh look at engine construction and components, with nothing borrowed from existing technology. Only state-of-the-art machining and materials have gone into producing this engine with features including the original O’Donnell-designed “big head” machined aluminum heat sink head, dropped down low for a better CG. Available in February.

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Features:
– The crankcase, cylinder sleeve and piston materials are optimized for uniform expansion to improve durability and reliability
– 4-port ABC cylinder
– Balanced Max-Flo™ crankshaft with Class 5 precision bearings
– Machined 7075-T6 aluminum con rod with double bushings
– Unique, compact 40spring header attachment design
– Includes a high-performance O’Donnell #99 glow plug

The carburettor on the Super Sport .21 has all of these advantages:
– Aluminum body
– Thermal insulating sleeve that prevents vapor lock
– Low- and high-speed needles with double O-rings on both
– Hard anodized slide barrel
– 7 mm and 8 mm restrictors included

Specifications:
– Practical rpm range: 3,000-42,000
– Output: 2.7 hp @ 36,000 rpm

Source: O’Donnell [odonnellracing.com]