Ok, I guess more of my question was related to what the actual firing order in degrees (ref. 720 deg.) would be for a big bang on an inline 4. I wasn't sure whether two pistons would be firing at once or if they would fire 90 apart. So instead of 0, 180, 360, 540 or 0, 0, 360, 360 it would be 0, 90, 360, 450 Does this make any sense? haha