Radical Sportscars’ continual quest to reduce the cost of racing, while maintaining all the thrills has taken yet another significant step forward with the introduction of the RPE 1500 Generation 3 short stroke engine for the 2014 Radical SR3 RS.
The capacity reduction from a reduced stroke has been equalised by increase bore size, developments in camshaft specification, a larger air box and the introduction of longer trumpets so that on-track performance remains as before. Other benefits include a reduction in high-frequency vibration, leading to smoother running characteristics and increased component longevity, particularly camshaft drivetrain.
This engine was tested extensively throughout 2013, including racing in the non-championship feature races at Oulton Park and Snetterton, where Radical’s chief development driver James Abbott matched his times from the SR3 Challenge races.
The benefits of this new powerplant include increased intervals between rebuilds. The factory warranty for this engine has been increased from 40 to 45 hours. Radical remains the only manufacturer in the world that offers this level of comprehensive factory warranties on all road and race engines.
The RPE 1500 Generation 3 short stroke engines produce lower levels of CO2, both in the manufacturing process and in running, through greater efficiency and reduced weight.
These new engines and the previous generation of RPE 1500cc engines will both be eligible for all 2014 and 2015 Radical SR3 Championships – the Radical Clubman’s Cup, Grove & Dean Motorsport Insurance Radical SR3 Challenge and Radical European Masters. From 2016 onwards only the RPE 1500 Generation 3 short stroke engine will be eligible. These new units are easily identified by the larger capacity, red air boxes.