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SSP pump unit demonstration...Video...

June 11 2017 at 5:48 PM
Phil  (Login Duane35)
Crosman Forum Member
from IP address

Pretty self explanatory in the video, I think. As it is, it is extremely loud and has enough blast out the transfer port to move the assembly while holding it. We shall see what happens when pushing pellets. As configured in the video, it is compressing 8.5 of air to roughly 2000psi.

Many have expressed concerns over piston vacuum on the open stroke. This design uses no weep hole on the tube to draw air in. Instead, there is a weep on the piston face near the radius. The oring gland is designed just like many, if not most, PCP pumps. Pulling the piston back on the open stroke force the oring toward the face exposing the weep hole, thus allowing air in. To achieve this, the gland is cut 1.75 times the width of the oring and then using a Delrin made spacer to fill the excess void. The spacer prevents the oring from too much movement within the gland.

This message has been edited by Duane35 from IP address on Jun 11, 2017 7:36 PM

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