What gear ratio would I need to gear a 269 to make it turn at the same RPM as a 393HS motor?
it would be better if u made the HS slow gearing and gear it externally because they are off by .066 rpm
(idk if there is a real life difference or not)
If you have not replaced the internal gears on the 393, it will spin at the same free RPM as the 269, which is 100 RPM. I’m pretty sure they were designed that way.