Ducati said 2007 motogp GP7 is a screamer engine,so is the firing pattern every 180 deg 1 cyc is fire up?

Question

Ducati said 2007 motogp GP7 is a screamer engine,so is the firing pattern every 180 deg 1 cyc is fire up?

Answer 1

Its not a " screamer " but it is a " big bang "

Answer 2

Your question needs to be worded differently, but let me say I love the sound of a V4 "big bang"

Answer 3

In short, yes.

A "screamer" fires evenly.  Since the GP7 was a V-4, that means one fire every 180 degrees of crank rotation (four-stroke engine, so one complete cycle = 720 degrees, and 720/4 = 180).

A "big bang" will group the firing order so that more than one cylinder will fire at a time.  In a 4-cylinder like the GP7, you're looking at one fire every 360 degrees, if the two power pulses are evenly spaced.