The engine looking the same type as the Museum's example, is hidden in maybe the darkest corner of the PeCsa.
 

A motoron fityegő (ld. fent) tábláról megtudunk némi újdonságot ha nem is túl sokat.

Azóta is szégyellem, hogy nem jutott eszembe hogy a táblát megigazítsam.

From the board hung on the engine (see above) we can get some new info, if not too much.
I am still ashamed that I did not get to align the board horizontal.

Translation of the board:
Six cylinder, water cooled inline aviation engine
Technical characteristics:
Maximum power output: 48kW / 70HP
Nominal rev: 1740 rpm

FEJES-made engine, made of autogenous weld iron and steel plates. It was a new method in aviation industry to weld engines from plates. The propeller was driven by the camshaft, for reducing the rotational speed. The engine was used in experimental aircraft made by SZEBENY and ASBÓTH.
The power source had little power for aircraft, but was used succesfully in small cars.

(Ascot - Great Britain)