Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!
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Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!

This is some serious home engineering

A home-built, 10-cylinder radial Twin-Star two-stroke engine would be impressive if it came from an established manufacturer but when it comes from the home workshop of a Czech motorcycle enthusiast, it’s off-the-scale impressive. And he even builds the rest of the motorcycle as well.

Engineering Wonder: 10-Cylinder Two-Stroke Radial Engine


Every now and then you come across something that makes you realize that your own attempts in the workshop are actually not all that impressive and that maybe you should just give up and leave it to the professionals.

Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!
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Bistella 500
A home-built, 10-cylinder, twin star radial, vertical crankshaft, two-stroke engine in a home-made chassis. Show off!

Which would be all right if it was only professionals who were creating something special. When it’s just an ordinary Czech guy - Marek Foltis - in his workshop building a radial, 10-cylinder twin star, vertical crankshaft, two-stroke engine, plus the rest of the motorcycle as well, then maybe it’s time to curl up in a corner and give up!

Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!
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It Starts With A Drawing
And that’s the easy part

What is even more amazing (if that is possible) is that each cylinder has its own tiny Roots-type supercharger to compress the intake gases! I mean, come on! That’s just unfair!

Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!
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Multiple Superchargers
Each cylinder is fed by a mixture compressed by a miniature roots-type supercharger

The video shows the process of the build in both stills and video and goes some way to illustrating the engineering needed to create the engine. A commentary would have been great to explain some of the details - for example, was absolutely everything created from scratch or were parts modified for the purpose?

Engineering Wonder: Home Built 10-Cylinder Radial Two-Stroke!
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Then Build the Rest...
Virtually the whole bike was home-built. Even the script is gold leaf!

It hardly matters, to be honest. The skill needed to conceive and draw, let alone build and run, such an engine is incredible. I can only imagine that the guy is an engineer of some sort, although it doesn’t always follow that that is the case.

It would be a bit easier to swallow if the resulting bike was a bit ugly but, in fact, its absolutely perfect in a 1950s BSA-Bantam way.

Harry Fisher
Harry Fisher
Motorcycling Contributor
Born and raised in England, he has lived in South Africa with his family since 2002. Harry has owned examples of Triumph, Norton, BSA, MV Agusta, Honda, BMW, Ducati, Harley Davidson, Kawasaki and Moto Morini motorcycles. He regrets selling all of them.  Read full bio
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