2001-2006
For the 2001 Academy, cars were supplied with the more modern Dedion chassis, and a Rover K series engine. An increasing number of cars were supplied with full rollover cages by this point, although it was not until 2003 that all Academy cars came with a full cage rather than a FIA-spec rollover bar and supporting strut in the passenger footwell.
Cars were supplied with the Caterham (Arch Motors) race chassis in 2001 and 2002. This is recognisable by a shorter passenger footwell (to accommodate the battery in the engine bay) and the handbrake under the dash on the passenger side. Cars from 2003 to 2006 were supplied with a centre (tunnel) handbrake.
From 2004, the Academy chassis was modified slightly and made more rigid. The transmission tunnel was raised slightly, and all cars were supplied with a lowered floorpan, giving the driver a couple of inches more headroom under the rollcage. The rollcage supplier changed at this point, as cars were supplied with 'Caged' rollover cages with slightly curved bars and different frontal load protection, rather than the 'Safety Devices' cages with straight diagonal bars of 2001 to 2003.
2005 cars were supplied with the new style combined side-impact and wheel intrusion bar, which allows the doors to open (the older style bar does not).
2006 cars were supplied with a new D-style 'Caged' rollcage. 2006 was the last year of the Arch Motors Academy chassis.
Read more about this topic: Caterham Academy, Academy Years