This is a manufacturer from Europe. They made one of the first air-cooled, six-cylinder, radial engines that were built. It gave 150 hp at 900 rpm. and ran with two-stroke cycle.
-The displacement of each individual cylinder was 151.15 cu. in. so the total was 906.9 cu. in.
Engines of CENTRUM
Model: 6 cils. radial 2T, 150 HP
The author of this edition of Aeroengines AtoZ, through Aeroteca, collaborated on Version 2 of this video, which is presented here.
To understand the operation of the connecting rods, the 1929 Continental R 670 single-cylinder engine was chosen.
A demonstration of Version 3, improved at the author's suggestion, is also available on YouTube at a later date. This version shows bronze valve guides, improved valve spring movement, and the split crankshaft counterweights and front bearing balls also move.
The design is from Juan Soler, Sant Cugat, Barcelona
Below we show a flash of version 3
Counting also with the coloboration of JMC of Enginys Mecanics in Mataro, Barcelona