Calling DSM experts (compression issues)

[killab443]

I purchased a 6 bolt short block because my timing belt went and put a hole in a piston. The short block was purchased from a guy I met online, it suposively came from a running car. Anyway the block sat in his garage for 2 years. I finally had the time to put the engine back together. New head new timing belt, new gaskets and pulleys, waterpump, ect. Now I tryed doing a hand turned compression test and Im getting like 30psi. My question is do the piston rings dry out after a period of time? meaning does the fact that the block sat for 2 years effect the compression? Will I see higher numbers after the motor is running? Well at least if it runs...

 

[BISHILVR]

First of all dont bump your thread's you will end up getting the thread locked for that . As for the compression question, you can't check the compression by cranking the engine over by hand. Installed the engine compression is checked by cranking the engine over while holding the throttle wide open. Also no, rings dont dry out and you will not achieve full compression until the engine has been broken in and the rings have seated in the cylinder's.

 

[eclipse08]

If you want to get the compression done correctly, you have to make sure the engine has warmed up completely as well, you'll never get the compression numbers you should on a cold engine or by doing it by hand. What has worked well for me is just warming the engine up, disconnecting the starter relay, hooking up a compresion tester and cranking over a couple times on each cylinder.

 

[killab443]

The engine is out of the car and I just finished putting it together

 

[blueberry_dsm]

If you want to get the compression done correctly, you have to make sure the engine has warmed up completely as well, you'll never get the compression numbers you should on a cold engine or by doing it by hand. What has worked well for me is just warming the engine up, disconnecting the starter relay, hooking up a compresion tester and cranking over a couple times on each cylinder.

and thats how its done. along with the starter relay, u should also disconnect the fuel pump relay. no sense wasting gas by floodin the cylinders.