How can i tell the difference between S4 and S5 rotors and housings? I bought a keg that i am tearing down, and i think i might have been told it was an s5 when it was really an s4. Is there any way to tell? weigh the rotors?

thanks
brandon

 

S4 rotor dish is cast and thus has a rough surface,
S5 rotor dish is machined and is smooth with very small machine lines running parallely to the side-seal edge.

S5 rotor housing has a threaded hole for the knock sensor (even the N/A housings) above the trailing plug. The S4 rotor housings do not have this threaded hole.

 

thats good, looks like i do have an s5 block! thanks

branodn