I know my engine needs rebuilding, but i was checking the compression to find out what needed to be ordered for the rebuild. When I checked the front rotor it read fine and the rear rotor barely had any air pressure, but when i checked the rear it read zero psi throughout the rotation, and the pressure from the first rotor was more intense and i couldn't listen for any identifying sounds.


please help me out

 

Completely blown rear rotor?

 

did you turn the fuel pump off? if you didnt that can flood the engine and cause a change in compression.

 

That would make the compression higher, as the fluid would give the apex seals a better seal. Also the increased volume in fuel would jump up the PSI.

If you have no compression, then the apex seals are broken/stuck, or something else.. when I say something else I mean really really bad something else

Start the engine and do the water trick, except use throttle body cleaner, use a whole can. Do a test after that and tell us how it goes.