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Today I finally got around to making a short video. I'm quite happy with the smooth running of the large ignition, but the gas lighter ignition (at the beginning of the video) is unfortunately lacking a bit of power. In the video it unfortunately runs with a rear silencer because it is quite...

Don't think I've given up.It works! Not just in CAD, but in real life too. I got it running yesterday with an OS carburetor from a small 1.5cc RC engine with petrol.It ran at around 900-1600 rpmDue to the success, I sat down at the computer and designed a new carburetor that will be built in the...

It makes its first independent revolutions, unfortunately not with petrol but with gas. 4mm carburettor diameter and a 100mm lighter gas flame. In comparison, my 4-stroke engine, with roughly the same displacement, runs with 1mm passage and 25mm flame at idle. Both are also about equally...

Thanks for the suggestions. The piston seals well even without a piston ring, it has just 0.01mm of installation play. That was also the reason why I built a new cylinder sleeve. I've also tried a cylinder head that extends 2mm deeper into the combustion chamber. It always comes to the same...

Don't think I've been idle the whole time, I've been fighting with the engine almost every day. I pulled out the cylinder liner and turned a new one. Tried a little earlier exhaust times. No change from before. As I'm slowly running out of ideas, today I tried to reduce the dead volume of the...

I made a little video. He just doesn't want to run alone. The overflow channel now opens 3mm after the outlet channel. It should be easy enough, but it simply lacks strength. Possibilities that I still see now are too low compression or too much dead volume in the crankcase. I'm slowly at the...

Today I excluded the carburetor as a source of error by using an RC carburetor and a sheet as a valve. Unfortunately without success. He ignites more often, but it is not enough to run independently. Incidentally, I also tried another ignition to exclude this source of error. All that remains...

Hello Bob, Did you get him running with the original carburetor as a 4 stroke? I just made a launch attempt but more than a few ignitions he doesn't do. Hallo Bob, Hast du ihn mit dem Original Vergaser als 4 Takter zum laufen bekommen? Ich habe gerade einen Startversuch gemacht aber mehr als...

I started the restoration without drawings. First I had to rebuild the crankshaft and replace the ball bearings with plain bearings. To ensure that the engine runs for a long time, I decided to use hardened DIN 6325 cylindrical pins that run in sintered plain bearings. Machining the crank pin...

Hello from Germany, I came across a defective Hubbard 1912 on eBay that I was able to buy cheaply. Now I have to find out why it doesn't run.The builder decided to use plain bearings instead of ball bearings, which couldn't withstand the pressure of the not so precise crankshaft and broke. But I...

Hello community, I have been building engines since my apprenticeship 30 years ago, starting with compressed air engines, Stirling engines and even self-constructed combustion engines. I stumbled across a Hubbard 1912 2-stroke marine engine on eBay. While researching the engine, I came across...