2011 HONDA CBR1000RR
194bhp 2011 Honda Fireblade leads this month’s pick of the reader specials
I THOUGHT it was time to fill you in on stage two of my 2011 CBR1000RR’s upgrade, since you featured the first stage in the mag.
Well, it went even better than hoped; I now have the engine that Honda should have built, with power output up to 193.9bhp @ 12,287rpm at the rear wheel – an increase of around 33bhp from standard. Torque is up to 87.92lb.ft @ 10,169rpm, a gain of 9lb.ft.
Stage one comprised of an Akrapovic exhaust system, Ten Kate Racing cams, special bellmouths and a K&N filter to help breathing, which netted 180bhp. But I wanted to match an S1000RR.
During stage two, the compression ratio was increased from 12.3:1 to 13.1:1, and an adjustment to the inlet valve clearance and cam timing has also been made to maximise the power output. On the CBR1000RR, reworking the valve ports will have little effect because the engine was intended for racing from the outset. However, you can improve the breathing further and encourage easier transfer of spent gases by removing the height difference between the valve seat and ports. The Honda engine, as I see it now, is equal to that of a 2017 S1000RR.
Stage three will have to wait for now, and will be subject to how the standard suspension fares at Brands Hatch in the summer. I hope your Fireblade project goes as well as mine and will keep a close eye on what you do. ( You can find out how it’s going on page 99, David – CN)