Recent content by Vietti

I know as an engine builder it is embarrassing not to be able to get a weed whacker to run. I have had some luck replacing the carb with a cheap replacement from China

Though I've never printed anything but paper copies, I am very impressed with your printed crank case. I hope you will continue to post updates and maybe some details re. the printing process.

Separate the gear and flywheel. The gear holds the one way clutch and rotates on the crank. The flywheel is attached firmly to the crank?

Peter, Can you put the one way bearing on the crank instead of the the starter?? Better anyway because the belt/chain stops when the engine starts.

Xander, It appears you soldered a plate to the big end of the rod before sawing in two?? Seems a great idea!!

I'll take it. PM inbound

A quick reminder- in the last or next to last issue of SIC magazine a Dutch(?) builder ran an article on building a diesel engine he called the "DUX". I remember his discussion of the injector jet as a scribed line down the side of a tight fitting cylinder.

Before you assemble you might consider a needle bearing on the con rod, I did it on my Hoglet and it seems pretty good. Also I drilled and reamed a hole at 180 degrees from the con rod hole to insert a dowel when aligning the flywheels, seemed useful.

For what its worth, I have had good luck using knitting needles for push rods. They are hollow, come in a variety of cool anodized colors and are light and strong. Simply use the pointed end in the rocker and press a ball shaped stub in the push rod end.

Enjoying this thread! I have made a handful of model carbs and none were outstanding. It hasn't been mentioned yet(?) but I like the OS carbs and the Traxis type carbs that have a drum type air intake that rotates on a spiral ramp and lifts the needle to supply more fuel as the airway opens...

Agree with Andrew. My Hoglet ran for a few hours at first and then the compression fell way off. Put in new rings and all was OK from then on. I think the O rings need a really nice smooth surface to run with. Previously I tried them in engines that had been running cast iron rings and the...

I don't know if it applies but american steam locomotives had a "petticoat" above the blower and exhaust nozzel. It is a venturi I suppose.

Cliff Roemisch in SD has been using hydraulic cylinder material for a few of his ic engines and really likes them. Think he uses the stock bore and finish. If he is on this forum I hope he chimes in.

Why not make the cylinder out of CI? I always, in the past, made AL cylinders with CI liners, but building the Hoglet I went with CI cylinders as suggested by the author. They turned out fine and I'm glad I did. Makes a mess but that's OK. Seems not to be an issue for cooling. Might...

I'd say try it, but it would be a shame to put a lot of effort into something and then determine the material was poor/wrong.