Test for zero friction and Nicky Vale - Big bang or Screamer? On the track in Valencia on 9 and 10 November 2010 Valentino Rossi and Nicky Hayden, The Ducati MotoGP Team, were able to try the new GP11 which will run the next racing season.
Ducati Corse engineers for the development of GP11 in need of data gathered during testing and the indications from the pilots. In particular, the team will have to decide what type of motor take, choosing from the 'Big Bang' and the 'Screamer'. What makes these solutions?
Big bang and Screamer are names that indicate the different power-up sequence of the 4-cylinder engine of the Desmosedici. The Big Bang includes the four switching over little more than a turn of the crankshaft (in particular 380 °), thus taking into account that the cycle is two complete engine revolutions, for almost a full turn does not have active phases. Screamer instead distributes more evenly throughout the combustion cycle of the two laps complete.
Assuming that each cylinder can provide the same maximum power during the 'active phase', the two engines should deliver the same average power calculated on the full cycle (corresponding to a rotation of the crankshaft 720 °).
In fact, the individual cylinders do not provide the same power in two solutions for the power up sequence significantly influence the intake and fludodinamica drain. This justifies the fact that the Screamer engine may have a different average power from the engine Big Bang.