I have been messing about with a couple of spare compressors this afternoon and have noticed something possibly amiss.....
The exhaust valve makes sense with it's O ring seal and stiff backing plate, but the way both of the units I took apart were assembled, the
intake reed valve has a short piece under it which effectively prevents it from sealing on the flat surface of the head. This allows a lot of air to return to the intake side
on every compression stroke!
Thinking this was wrong, and as I have 2 on the bench, I assembled one as it was (and like I saw in several you tube videos) with the short intake reed below
and one with it in the logical place, above.....
Upon bench testing, the second method provided about 2x the airflow. To eliminate the variables of piston and motor, I swapped the order of assembly on both and re tested.
Same result. Short reed above and long reed on the bottom works much better......
Next, I will check the 2 pumps on the Borrego and Bolt.....