Quote:
Originally Posted by hvacman250  Take it apart and look how it gets air to the chamber/body. Pay close attention to the alignment of the holes and you will understand. # holes need to be drilled larger to make it work properly. |
After reading your earlier post about modding the pump kit, I decided to look into what made it tick. I found only one small vertical hole in the banjo bolt to allow air into the valve chamber. If that hole didn't line up perfectly, air needed to flow over and around the bolt threads and I knew that couldn't be efficient. I compared the "semi" banjo bolt and it had 3 larger vertical holes as well as a grooved area if the holes didn't line up with the vertical asa. I modded the WWA banjo bolt by increasing the hole size to 5/32, also drilled it completely through instead of it only being on half the bolt, AND discovering that it needed to be closer to the block to actually line up with the asa, I placed a 3rd and 4th hole offset 1/16th closer. I also drilled out the asa to 5/32. That was the size of the horizontal hole in the WWA banjo bolt. While there, I added a hole near the front of the pump slide on the banjo bolt to accomodate a bar to tighten the unit. It was all reassembled and seems to work fine now. So it doesn't appear to be a spring issue after all. Thanks, hvacman!
Original small hole in vertical asa;
Redrilled to 5/32;
Original WWA banjo bolt with one small vertical hole halfway through;
Redrilled to 5/32 all the way through and threads milled to a groove;
1/16 offset hole all the way through added;
Now has 4 air holes and groove rather than 1 and threaded. Notice the offset to align to vertical asa;
Extra hole in front to assist in tightening;
