What is meant by the term 'the engine firing interval'?

Answer 1

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