Originally Posted by JamesHealey

The standard RB CX (2012 engine) is just as fast as the RB CXR (2012 engine). The only difference is the counterweights in the crank shaft, the exhaust, transfer and crank timings are identical between the two models, the CX is a very good engine based on the Novarossi Flash PT/35 Plus 21 era of engines.

The RB CXR SLS DI9, CXR SLSV2 which were the longer stroke design were fantastic, tonnes of power through out the entire power band, these were based on the Novarossi Keep-on and were immense engines.

RB pistons were cut from billet where as Novarossi were made using microcasting, the reliability of RB engines was fantastic, as was the performance.

Very good engines!