Bringing this post back up from the dead... before I document in my build thread, I want to be sure I've got this right. It doesn't seem to close very far. I think that I have the flapper oriented correctly.
Curved side is down, facing the exhaust port. The ridge is on the top, facing up toward the head. Is this as far as it is supposed to close or am I missing something.
https://www.youtube.com/watch?v=0vewPHrZ33U
Here's how I assembled it:
Long pin through the hole, lined up through the hole in the top of the flapper, and into the other side of the cylinder:
Slid in the valve with the rotating pivot point:
Insert the other valve, with the short pin. I put the pin through the slotted hole in the flapper and into the hole on the other valve:
