They are on opposite strokes. When one is on compression stroke the other is on exhaust.
That model is how it is on the real thing.
ok, so to be certain, and display my lack of quick understanding:
- I am assuming the left crank is pointing to the engine front.
- so, back left side pistons are 1-6, with the two, middle pistons being 3/4.
- 3&4's common crank buddies, look to be 9&10.
- based on that, they are firing at the same time? or ....
what I DO seem to see is a very smooth firing sequence across all pistons, causing the crank to be looking even in power at every degree, rather than simple four piston vs 6 vs 8
would like to be able to stop that in play or show in color when each fires.
I did read the firing order is 1-7-5-11-3-9-6-12-2-8-4-10 : In my sceanrio guessing 3&9 at same time and 4&10 at same time but on 180 degree cycle off of the 3&9.
but not sure if that means in a split second/degree of each other or are there meant to be more than a pair at a time.
my ignorance and one would expect I shouldn't be asking these questions years after the purchases