Quote Originally Posted by brsanko View Post
Now this is the kind of advice I'm looking for. I currently have it set up so that the opposing pistons are basically one unit, so that each pistion assembly has 4 combustion chambers.(see pic) Would it work better if the piston assemblies were a few degrees off? More than a few?
You need to consider power delivery. Each time a cyclinder fires, you get a high load followed by a power surge. This causes the crankshaft to deform, so it's got to be suitably designed to handle the peak torque. By having two cylinders firing at the same time, you'll be putting a lot more stress through the crankshaft.
Ideally you want power delivery at equal intervals, which would mean the two crank pins being 90degrees apart, however you'd have to take into consideration the crankshaft balance.