Aloha, This is my first post, I am happy to be here. Would there be any advantage to a internal combustion engine(ICE) that fired two pistons simultaneously? This would be an alternate-firing ICE that would fire the pistons in pairs every 180º, instead of one piston fire and the other piston in the intake stroke every 90º. For example an alternative-firing small block chevy(ALTICE) 350 cubic inch engine. In the ICE at 0º crankshaft, pistons 1 and 6 are at the top of the cylinder. Piston 1 fires (Power-stroke) and piston 6 is in the (intake-stroke). ALTICE in comparison, has both pistons 1 and 6 that are in the (power-stroke), this 1-6 pair would have its intake-stroke on the second rotation of the crankshaft. ALTICE would fire the pistons 7-4 at the 180º. On the second rotation of the engine cycle pistons 5-8 fire at 450º and 3-2 fire at 630º. See attached image. ALTICE would be like converting the SBC V8 into (2) four-cylinder engines that fires "in-phase" utilizing the chevy cross-plane crankshaft. In contrast to a Ferrari 458 V8 engine that is like (2) four-cylinder engines that fire "out-of-phase" using a flat-plane crankshaft. What would the pro and cons of an ALTICE type engine? Would the torque be increased because of the second pistons simultaneous firing? Would the piston (power) pulse increase? Would the fuel consumption be the same? The same 8 pistons fire over the same two crankshaft rotations in both the ICE and the ALTICE. Do you think that the ALTICE would rev easier because of the every 180º crankshaft firing, in comparison to ICE? What would be the disadvantages of an ALTICE design? To my knowledge there is no ICE that fires two pistons simultaneously, I was just wondering why.