Yes, it has been a bit quiet and I too have been silent for a while.
Just recently went through a rebuild of my 13B due to low compression … prior to that you may remember that a tension bolt broke and was extracted/replaced.
During disassembly of my engine I found one set of APEX springs flattened, another broken tension bolt and one corner seal broken at the narrow point.
Engine was overhauled with new o-rings from RWS; original APEX seals reinstalled – but all APEX spring sets were replaced with OEM Mazda parts.
I bought and installed a set of solid corner seals from ATKINS.
All the tension bolts were upgraded to the S5 series heavier style.
The ’88-S4-9.4:1 compression rotors were replaced with a pair of ’91-S5-9.7:1 rotors.
The oil-out port was moved from the front cover to the front housing, after drilling through to the oil gallery and tapping for a connector – this removes two 90 degree turns.
The PSRU oil-return port was moved from the front cover to the bottom of the rear rotor housing, after drilling through and adding a connector.
To date only 2 hours on the rebuilt engine … it is making a bit more power – indicated by a richer mixture requirement for best power.
Jeff Whaley