Hello everyone !
After i had to sort out a few issues with the transistor ignition which killed tons of hall effect switches ( bad lead to engine block ) the engine is running.
You will see a video of it in my next post. The video is made with my smartfone so unfortunately the sound quality is not the best.
To make this build log complete i also post a few pictures of the machining of the parts to make the engine complete.
I have to admit that i was not able to stop the massive oil pumping as a consequence of not properly working oil control rings so i have to use 1:50 mix to run the engine. Maybe i will build a little two cylinder test engine in the future which is easy to dissasemble to have the possiblity to do a little reserch on oil control rings but i am happy with the " 1:50 solutuion " also.
The carburettor which is used is a simple one needle type without air bleed and was initially for temporary use but it works so well i think i will keep it. Of course it still needs a litte fine tuning. The idle could be a bit lower but i am close.
The cooling without wather pump is working very good. To my surprise no water pump is needed.
The pictures :
1 : The water hose attachment. I usually planned to cast this little pats like most of the other parts too. But it was easier to solder them together from seperate parts.
2 + 3 : The mounting for the radiator fan shaft is also a soldered part.
4 : The cover for the valve stem gallery. The oil line goes to the camshaft gears. I hope the oil wich is collected from the gears is pumped to the valves.
5 : The ignition wires are 0.5 mm copper wire. I have seen many pictures of the original model a engine with unisolated wires so i copied this.
6 : The cooling fan is made with the 3d printer. It is driven 1:1 by a rubber belt made from tire inner tube.
7 : The fuel tank is recessed in the wooden engine stand so i have made an opening to check the fuel level from the outside. There is a led light in the box behind the glass tank to make it easier to see.
Best regards,
Thomas