2011 HONDA CBR1000RR

Performance Bikes (UK) - - Contents - DAVID CLARKE

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)

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