PIMA's Nakajima NK1C looks Mitsubishi Kasei model 22 but I must know its exact diameter before saying more clearly.
Diameter:
Kasei 1,340mm
Kinsei 1,218mm
Zuisei 1,118mm
I am wishing your good luck at J-aircraft, msxyz.
Also, Thanks for such a nice information about the Japanese aircraft wrecks, Snautzer01.
That place looks a treasure field.