RE: ? rotary valve differences between 160b2-rv and Champion
"Rotary valves simply do no fall apart" Well they don't
Didn't mean to imply it. Our engine sucked in a loose wire or hose from inside the fuselage and that caused the nylon hex drive to shear, Our fault.
We think ZDZ makes the best airplane engines, Period (No BS). Our 160 is twice the displacement of a Zenoah GT 80 and it weights the same and it's durability and power output has been incredible.
The reason for the first thread was that there is no documentation on your site or ZDZ's site for rotary valve timing and the new valve has 20 degrees more duration than the old one.
Without proper specs for timing (unfortunately our engine is missing the timing mark on the crank), all I can go by is the standard timing for many 2-stroke engines of; Open @ 145 to 147 deg BTDC and Close @ 65 deg ATDC and those specs don't work.
It would be safer to open the new valve sooner than to close it later, but without proper specs, the only other thing that makes sense is a casting change on the rotary valve cover.
Your help with this would be greatly appreciated