The 140 - brokein -in on a pipe -is equal to a 1.20 YS setup right -
in a 9-10 lb model -it does work very well - we have used one in one of our EXCESS models
You must not build a heavy large model for best performance - about 900-1000 squares tops
I made three gas pattern models using the ZDZ40 - these are at 11 lbs - incredible power-1280 sq inches .