I noticed that the front sounds different from the rear. Is this normal?


http://www.youtube.com/watch?v=DMflTrwgKss

 

Well, the front rotor is blown. The pressure reading is what matters, not slight differences in the sound of air venting.

 

If either rotor were blown the bump test would show one, two, or three VERY low bumps. Basically: if one apex seal is gone, two chambers lose compression. If two or three apex seals on the same rotor are gone you'll see almost no compression on that rotor. If only one side seal is cracked, blown, or stuck then you'll see one low bump (a stuck side seal can SOMETIMES be remedied without a rebuild, a water or seafoam treatment may work, but be aware that you could dislodge carbon and damage the motor further).

HENRX7's test shows even bumps for both rotors, and for compression 110 and 105 are pretty decent for an aging rotary. It's likely that the difference in sound was due to a slower cranking speed. You did the front rotor first, so then the battery is already losing a little umph by the time you do the rear. This may also indicate that your rear reading of 105psi is low, as the cranking speed is reduced. Watch the video and listen to the RPM. Sounds like it's a hair slower to me.

Anyway, read this if you have any more questions: http://rotaryresurrection.com/2ndgen...ion_check.html

 

Nevermind. Mixed up his readings. 60psi cumulative pressure would mean low compression on one rotor. But 100+ psi is great.