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Hi DKGrimm, Interesting to hear how we all solve problems/opportunities differently. I didn't cut my own rack and drilled and tapped the end to receive studs for the piston attachment. I remember destroying a piston and stud and top brace when attempting first fires. It loaded up on acetylene...

Very nice finishing work Bruce, Yes the bore was difficult and I'm amazed it worked out as well as it did on my equipment. I have heard others mention recycled hydraulic cylinders as a building block for their engines. Thank you for sharing your story and photos. Two months must have entailed...

Hi Colin, that looks amazing! I didn't know you were so far along. Glad you were able to figure out the valve block to cylinder fastening. Keep up the good work, and thank you for the mention 😁

Gear making is very satisfying when everything goes correctly. I believe it is akin to releasing a freshly casted part from the sand, or fitting a pin so precisely into a hole that it snicks when removing it 😁 It can also be frustrating when things go wrong. This was one of those moments. I...

Cylinder Ordered some large 6061 aluminum blanks for the separate pedestal and capital. Seemed like it was taking forever with my small benchtop WEN bandsaw to cut the parts so I tried making a lazy man's self cutting feature. Bungee cord and wood clamp on the trigger. 😁 Seemed to work but...

That looks great DKGrimm, Looks like you had a bigger lathe and a very rigid reamer for the cylinder bore. Also see that you cut the rack yourself. I couldn't figure out the setup for that so I had purchased it and all the other gearing. I needed to make my own centers and hubs. Some tweaks...

Gears The brass for the gears arrived so I started them today. The cam gear will have 120 teeth because I am using a 20 pressure angle 48 diametral pitch cutting set based on Mr. Ivan Law's book GEARS AND GEAR CUTTING. I already have a #2 cutter ready to go. I will design the cam gear with a...

Hello Brian, I have resisted the urge to buy a 3D printer also. I needed a distributor cap on a small V-8 engine model. Other builders used CNC and Perspex and they came out great too. Please consider making a cutter tool from 0-1 tool steel to form the spark plug lead towers. The tool is...

Cylinder Core Boring the cylinder pushed the limits of my benchtop lathe. I started by making a pair of fixtures similar to traveling steadies that would bolt to the t-slots on the cross slide and hold the round bar to enable drilling and line boring. I didn't own a welder or have large part...

Thank you, Cool Springs museum has an impressive collection of restored engines and their members have built full size versions as well as scale replicas

Thank you It is one of my favorite engines. The power stroke occurs as the piston and rack descend downwards with gravity and the cooling of the exploded gases providing the motive force. I will post more pictures of the build and some explanation of how I interpret the functionality

I found a 1 lb. can of calcium carbide pellets online. I was told about this by two old timers at work who remembered using it for racoon hunting lights and when helping their dads do oxy/acetylene welding. Doing it this way added a cool feature and also eliminated the regulator. I still have a...

thank you, it took around a year to build and I really enjoyed it. Largest flywheel I ever made and the taper flutes were also a first time evolution.

thank you, it is speed regulated by adjusting the small exhaust valve at the bottom where fuel is connected. Also need to control the water drip rate on the acetylene generator

thanks for that tip Sprocket. I was wondering about the epoxy suggestion also. I think of something thick like JB Weld when that word is used. Maybe just a toothpick dab of it is what is meant?

Thank you Green Twin! Rocker Arms These pieces look deceptively easy as drawn, but involve a fair bit of mill work and rotary table foolery to get right. I didn't have the recommended 7075 aluminum which is a little harder as I understand it. I used some past project scrap as they are only 3/8"...

Hello All, Wanted to share some pictures and videos of a very interesting and unique internal combustion engine that I built several years ago. There are several members that have built this engine already and their information was extremely helpful. A lot of information exists on the web...

Valves After fabricating the valve spring retainers and push rod adjusters, I assembled the valves into the seats and leak tested using an El-Cheapo brake bleeder. I simply grease the end of the plastic adapter and hold it in the exhaust and intake ports. My goal is to see if I can create a...

Valves thank you for the suggestions on the 2-56 set screws. I may just have a poor quality (Amazon) set. I can hold the screw in my fingers and twist the hex key and feel slipping. Have ordered some from McMaster Carr made from black oxide alloy and two new 0.050 hex keys. I need some for the...

Thank you Chuck. This is a fun engine to build with new to me work techniques. The cam lobes were a mathematical challenge today. Camshaft I used a right angle triangle along with the arc sine function to estimate the rotation of the ramps on the camshaft and incorrectly cut the first one. 🤡🤡🤡...