B&M Blowers 174 type. timing issue?
 

can they loose timing and one looses boost. lets say 5200 RPM and the other 4400 RPM. I have 2.5 lbs on the 4400, and 5 Lbs on the 5200. Some thing up. I may have to swap blowers and see if repeats but different engine. this issues is getting worse with time. both engines run awesome, no smoke or knocks, great oil pressure. Any thoughts. B38

Is one of the blowers just worn out not creating boost?

They both rebuilt 4 years ago, both should wear the same, not like this. I'm thinking the gear timing is going south which retards rotors, thus less boost. so far that is my guess. if I swap blowers will answer my ?.

when first rebuilt the other blower advanced and Teflon strips starting hitting mate. I sent them both back and they stated timing of the gears where the problem