Well, OK. So, let's see.
We have a 4 stroke Boxer engine. That means we have 3 pairs of pistons that work together like that:
So 1 and 4, 2 and 5, 3 and 6 are pairs.
Let's take a closer look at 1 and 4. So 1 and 4 are allways at the same position and at OT. The difference where we are in the "stroke cyle". So if 1 is at OT and before ignition - all valves closed. 4 has all exhaust valves open and all exhaust gases are out of the cylinder.
So if 1 is at OT all valves closed and you crank the crankshaft 360 degress 4 is at OT all valves closed.
Because we have a 6 cylinder engine, there are 4 clinders left.
First, they work also as pairs. So the same logoc as above. But they work with a different timingcycle because of the crankshaft has a 60 degree offset for each pair.
In combination with the firning order i think now you should be able to make a spreadsheet and note all OT and crankshaft turn degrees for your engine pressure loss test.
Animation:
https://youtu.be/JDYHyGNFR5Y
Regards Markus
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