This is a new Shocker Sport conversion that I begun working on after the intermittent success of the original Spectre modification.
I had decided that the valve design was adequate, but didn't produce enough of an unbalance to fire the marker to the standards I know it should have obtained. When coming up with this newer design, I turned my attention back to the original Shocker Sport parts, and made only a few small alterations to how it operates. This newer design involves less modified parts.
Two main changes were made from the first version. First (less important), I decided to re-use the stock fill poppet assembly, with a slight alternation. I modified it to provide a better seal for the dump chamber, which is something that the original Shocker should have had in the first place. The stock poppet is a metal-to-metal seal which doesn't seal the inlet too well; my new poppet uses an o-ring and works much better. This is used in conjunction with the new firing valve.
The new firing valve itself operates similar to the stock firing piston, in reverse. My original Spectre mod used the solenoid to push the poppet open from behind (using a new fill poppet). This new Spectre mod will use the solenoid to remove force holding the piston shut, thereby releasing it and releasing the dump chamber. The modified fill poppet assembly adequately seals off inlet to the dump chamber when this happens, allowing no air to leak out.
This is essentially how the Autococker mQ valve functions. It uses an integrated solenoid to introduce a small leak, which unbalances the firing poppet. My version uses a pneumatic solenoid to vent the air and create the same unbalance.
The other large change I'm trying to perform is using a modified bolt piston that uses a new solenoid. The solenoid itself is functionally the same as the stock 4000, however I'll be attaching it to the bolt using hoses and quick-exhaust valves (QEVs). This involves plugging off the bolt piston's ports, drilling and tapping it for the QEVs, milling to the body to accommodate the valve, and some drilling into the body for the solenoid to attach. Ideally this modified bolt piston will increase the firing speed by a few balls-per-second, since that's one of the principal limitations on the marker. Using QEVs will increase the firing speed in conjunction with the new, efficient firing valve.
Currently, plans are stalled on this project until I finish other projects ahead of it.