Im looking at designs for a engine, but im giving myself a headache over something which is probably incredibly obvious. Ill explain it as simply as I can in text and ive drawn a (terrible) paint image to help explain it a bit better. There are two cylinders. One cylinder needs to have its piston position 90 degrees offset to the other cylinder. If the cylinders are mounted at 60 degrees to each other, does the crank offset for the second cylinder need to be 90 degrees offset or 30 degrees offset?