What is meant by the term 'the engine firing interval'?
Its a scary term at first but its easy to understand once you
get the knack for it. An engine that has a 270 degree firing order
means the bangs (power stroke) from each cylinder are 270 degrees
of crankshaft rotation appart. When cylinder one fires, cylinder
two will fire 270 degrees later, this trend would continue if the
engine had more cylinders i.e. 4,6,8,10, and 12 cylinder engines.
If and engine had a 360 degree firing interval its the same as
above, cylinder one goes bang, cylinder two goes bang 360
crankshaft degrees later. Hope this helps. Its a scary term but its
easy once you get the knack of it. Firing interval means the
degrees in crankshaft rotation the power strokes are appart in an
engine. Take for example the engine in the 2008 Triumph Scrambler
it is a twin cylinder engine with a firing interval of 270 degrees.
In this engine when cylinder one goes on its power stroke, cylinder
two will have its power stroke 270 crankshaft degrees later. Ok now
lets take the Cheverolet Corvette, Chevy has the firing interval at
90 degrees. So that means cylinder one fires then cylinder
8,4,3,6,5,7,2 follow all 90 degrees appart from each other. Hope
this helps