These vehicles with a steel tube spaceframed chassis are either home constructed or professionally built. The 'Specials' classes are split into three classes by the application of an engine capacity and/or engine type limit.
These 'Specials' are specifically designed to be strongly built enough to withstand a collision or roll over, but are not fitted with bumper bars as deliberate contact is explicitly not permitted.
There are unlimited modifications allowed, the engine/gearbox/transaxle/axle are free according to each class cc limit and specification. Specials are fitted with a multitude of engine types with 1.0/1.1/1.3 motorbike/1.3/1.4/DOHC engines/1.8/2.0 SOHC & DOHC engines/2.1/2.5 DOHC engines/2.8/3.0/V6/3.5/4.0/5.0 and V8 engines, mainly mid or rear mounted to Hewland/Renault/VW gearboxes or direct drive.
All of the specials classes are very popular with both spectators and drivers alike as many are geared to achieve in excess of 100mph... which on a 400m oval track isn't slow!
Class Eight: Up to 1420cc
Class Nine: 1421cc - 2070cc
Class Ten: Over 2070cc
Click Here to take a look at the rulebook.