Compression / irregularities/ engine balance
 

I did a compression test and found over all it looks good. I do see using a normal compression gage a small difference in the rhythm in one rotor than the other. One seems to have for a lack of better terms a slight glitch in its rhythm compared to the other. My engine builder said this is likely due to balance. He said when all the rotating parts are balanced as a unit this does not happen and its normal for this engine. I need a second opinion on this.

The rotors are offset from eachother if thats what your saying?

I'm not sure how to explain but as the engine is being cranked you should have three compression peeks. I see them in the front rotor. There even and in time over and over. In the rear rotor the compression peeks seem to be unbalanced. Theres a noticeable glitch but not on each rotation. The builder did say in a follow up conversation it could be an apex spring which has not broken in. I will keep an eye on it. I don't have a Mazda factory compression tester. I am guessing it can distinguish between the 3 apexes of each rotor, or at least show more clearly a problem. I am saying if one apex seal is not sealing well but does have some compression the standard compression gage moves so fast its hard to make out a clear measurement. I am sure it makes compression but maybe not as much as the other two on the rear rotor. The engine runs OK and I only have 750 miles on it. Time will tell.