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Welkom op het forum! Hoop dat je leuke dingen gaat maken. Jos

Where do you purchase the silver solder Xander? I buy mine at HBM but I wonder if there are other suppliers. Jos

Check this out...

The European Commission has banned Avgas per 1-1-2025. There are lots of diesel planes flying around in Europe, all using Jet A-1.

The picture of the engine shows the cross-section drawings. It does not seem too difficult to use this as a guideline to draw up the engine drawings, and, accordingly, the drawings of the individual parts. Presuming you have some experience in technical drawings, of course. Jos

Ziet er netjes uit..... Jos

Hi kf2qd, I have been operating model two-strokes for more than half a century and I still like them but, apart from balancing properties, I see no advantage of boxer twin two-strokes over single cylinder two-strokes of the same swept volume, since the twin cylinders ignite at the same time...

Today was a fine day for test running. Everything assembled with the split bigend conrod, rigged up and ready to go. It took a few attempts to find the right needle valve setting ( wide open..) and then.. well, see for yourself:

Today was a fine day for test running. Everything assembled with the split bigend conrod, rigged up and ready to go. It took a few attempts to find the right needle valve setting ( wide open..) and then.. well, see for yourself: The carb internal dia seemed still a bit too big because it...

Drilling and reaming the crankpin hole I found that is is very difficult to make this hole right in between the already drilled boltholes for the bearingcap with only 0,25mm to spare on each side . So instead of drilling and tapping the boltholes an then machining the crankpinbearing I decided...

So,I came up with the following design. First I made a dummy of " ordinary "aluminium to explore fabrication methods and possible interference with cam and crankcase. Yes, it looks a bit shabby but it's only for fitting purposes. Besides, if it was the real thing, no one would ever see it...

After a number of starting attempts the crankshaft was turning heavy so I took the engine apart an the crankshaft was a bit distirtes at the front crankpin. So , back to the drawing board. It was obvious that the front crankpin had to be silver soldered. Since the rear crankpin does only...

At last, the engine is assembled and fitted to the test stand. However, initial starting attempts were not succesful. The prop came loose every time the engine gave a pop. It turned out that angle of the cone ring and the propdriver were not exactly the same, causing insufficient grip on...

Monza...the city of the racing circuit and the home town of model engine manufacturer Gualtierangelo Picco. I made a visit to the factory in 1985, don't know if he is still in business, I used the Picco P90 15 cc boat racing engine for many years. Jos

I find 20 mm a handy dimension for cylinder bores, I used it for my Edwards radial 5 and now for my boxer twin. You could use the same fixtures etc. if you use the same bore everytime. 20 mm gives you just enough space in the cylinder head for valves and 1/4" 32 TPI thread for glow and mini...

Maybe you should look at the website of the German Maedler company, see www.maedler.de. They have representatives in Asia too, see https://maedler.nl/Statisch/Standorte.aspx. However, they don't come cheap. Jos

I finished the last parts: pistons. Remaining: all the fiddly jobs like test fitting ,airtightness of the valves testing, and last but not least , final assembly. This will take some time..... Jos

Intake manifold is now complete. The carb is "borrowed" from an ASP25 ( 4cc). Jos

Shrink fit of course...

A very light shrin fit. I don't want to use adhesive because it prevents heat transfer from the liner to the barrel. Jos