O’Donnell Super Sport .21 Off-Road Engine

O’Donnell® Super Sport .21 Off-Road Engine

Features

The crankcase, cylinder sleeve and piston materials are optimized for uniform expansion, which improves 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 4-spring header attachment design

Includes a high-performance O’Donnell #99 glow plug

A perfect choice for the ZO1-B!

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 the Super Sport .21 — it’s the engine that top-level racers will be asking for!

closeup pic of carburetor The carburetor 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

Features the original O’Donnell-designed “big head” machined aluminum heatsink head, dropped down low for a better CG. closeup pic of heatsink head