Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 26-Oct-2020

Olm made a 9-cylinder radial engine that gave 250 hp at 1,800 rpm. It worked with the Diesel system.

-The preliminary studies and the development as well as the tests were carried out at the Moteurs Obram company in Antwerp.

-Particular attention was paid to the combustion process, reducing consumption to 190 gr/CV/Hr.

-It seems that it used a pre-combustion chamber. For the tests that were exhaustive, they made a bench for a single cylinder as we see in the photo below.

OLM single-cylinder test bench at Obram
“OLM single-cylinder test bench at Obram”

Engines of OLM

Model: 9 cyl. radial, 250 HP

Arquitecture: 9-cylinder Radial
Cooling:
Total Displacement:
Bore / Stroke:
Power: 250 HP
Weight:

Other details:

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