O.S. Speed 21VZ-B V-Spec II Engine (L-OS13911) If you want to win World 1/8th Rallycross Championships you need the best engine... & this is it! From tough new aluminium cylinder head with cooling efficiency holes, to the ceramic rear bearing & the specially plated crankshaft with heavy metal balance inserts, the Speed 21 is all about no compromise. The engine of choice for the 2008 World Champion, Atsushi Hara, & most of the top seven finishers! Specification: Length: 65mm
Height: 110.6 Weight: 349g (12.32oz)
Width: 45mm Displacement: 3.46cc (0.211cu.in.) Bore: 16.60mm (0.654in.) Stroke: 16.00mm (0.630in.) Power Output: 2.5PS@34000 rpm Practical RPM: 3000~40000 rpm