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Perhaps you can also comment on whether the older motors were sometimes conservatively rated compared to modern motors or whether this is just another old myth (I was going to say old wives tale, but am aware that may be non PC :rolleyes: ). They frequently look massive (that's the motors, not the women folk), but I suspect this is not a good indicator.
I haven't measured the HP rating of enough of these older motors to feel confident about commenting on this. The other suggestion flying around is that Chinese motors produce less that their rated HP. I've measured the HP ratings of at least 6 of these motors and none have been like this. They may have other issues such as more vibe, shorter bearing lifetime, run hotter, etc but they were all able to meet their HP spec.