Caterham 270R
The 1.6 Ti-VCT Sigma engine superseded the original Sigma in 2014. Offering variable cam timing these later engines produced a little extra torque and power, as well as a small additional improvement in fuel consumption. This meant that the entry level engine increased from 125bhp to 135bhp, and the uprated version of this engine increased from 140bhp to 152bhp. This soon led to the model names being changed from Roadsport and Supersport to 270 and 310. Sadly, this incredibly reliable and exciting engine has now gone out of production and is no longer a part of the Caterham range.