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Just a little humor on that specification. The US Standard railroad gauge (distance between rails) is 4 feet, 8.5 inches. That's an exceedingly odd number. Why was that gauge used? Because that's the way they built them in England, and the first US railroads were built by English...

I have made a distributor cap using the 3D printer. Seemed to be OK but I had other problems with that engine

That either means that you have too many leaks to build pressure or more likely that it takes more than the 20PSI to move the schrader valve in the compression tester.

I have two of them. I have one that my dad made in 1981 and one that I made in 2005. They both have an "L" on the side. Ground off the part of the "B" that did not look like an "L". It was the first engine that I made and also the first of two engines that my dad made. We both also made a...

So how do you measure the diameter with three contact points? You said with a caliper but a caliper will not measure over three points.

I have a 1:12 scale lathe and drill press. I am thinking about making a diorama running these and possible others run from one of my steam engines. My question is what have folks used for the belting to run the machines and the line shafts? PM research offers belt per foot but I am wondering if...

I am trying to run a Corliss engine on compressed air using an airbrush compressor. My question is what am I missing in my calculations? The engine has 1.125 bore x 1.5 stroke. This calculates to 1.49 ci/stroke. Since it is powered both directions it should use 2.9 ci per revolution of the...

One of the things which has bit me in the past is that one of the valves does not slide smoothly in the valve guide. When it is activated slowly the valve seats but when it is turning over at running speed the valve hangs up and does not seal in time.

Brian: Take a look at Howell ignition buzz coil. https://www.model-engine-ignition.com/model-engine-ignition/ignition-modules

I have reached the conclusion that an air brush compressor is probably the correct way to go. I have looked at places like Facebook marketplace and there are used unit available. None close by but I will keep looking.

Has anyone used an aquarium pump to run a small steam engine? I am talking about something with 3/4" to 1" bore. My daughter teaches middle school and one of the sections that she teaches is the industrial revolution. She wants to show them a couple of examples of running engines and she would...

There are a lot of 66 year old males who never learned how to fry an egg.

Finally found out why the engine was not running well. The exhaust valve was hitting the intake valve at the top of the exhaust stroke. I took some off from the face of the intake valve so that they did not hit. Much improved. They were only hitting by a few thousands but that was enough. FYI...

Obviously there is not enough velocity at the jet to draw the fuel from the tank and atomize it. The throat diameter at the jet is 1/4" with 9/32" at the intake. I would guess that if the carburetor was built with 7/32" at the jet and 1/4" intake it would work better. By restricting the intake I...

It is just a 5/32 ID x 9/32 OD x 1/8" lg tube placed in the intake throat of the carburetor. Nothing exotic. Just a permanent choke.

You have the sensor facing the wrong direction. It triggers off from the face, not the end.

I have the engine running after the usual tweaking. It still only runs with the restrictor in the intake of the carburetor. Not sure why but as long as it works I am going to just leave it.

Brian: I am not sure about the s/s system but on some of the modules if you fire it without it being grounded it can burn out the hall sensor.

I think that the polarity on the magnet may be wrong. Also the hall sensor will trigger from one side but not the other. Turn the sensor 180. Triggers from the beveled side.

I don't want to butt in here but there was a discussion either here or one of the other forums where it was stated that the width should be cross section + 20% and depth should be cross section x 95% and that is what I have been using with good success. A 1/16 O ring has a cross section of .070...