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🤔...You mean I'm not the only guy in Tucson building model engines anymore?

The cams driven by some .5Mod, 24T brass bevel gears. Three up front and two more for the distributor. The bottom shaft will get a shaft stop collar to keep the gears in mesh. The ign. points will sit on the vertical leg of the 4x4. And its cam will be the shaft stop collar for the other...

The two halves of the engine mockup. Have to square up with end plates to the frame. Run a 5/16 in. transfer punch across through web to web to come up with a critical shaft centerline. With the lower crank endplates in place, how the bottom end will look with six bevel gears. I did not...

The pistons for a dual rod engine are somewhat weird. They are longer and have a more solid core as the rods are attached to their lower third, therefore heavier. A flat is machined across the bottom for the rod attachment. The depth of cut determined by the rod centerline to match piston...

Twin port valve blocks are made up from quarter inch bar stock. Self contained units with brass guides, leaded steel valves, o-ring seals. Four corner bolt together. A single fine thread 1/4 in. screw mounts blocks to head. A flat is machined to lower side of heads. Drilled for both ex. and...

Well either material works for cylinders Ger. Most likely for a model engine that doesn't see hours of run time anyway through the years, it is builders choice of materials with little consideration of which is the better for the purpose.

Making up a pair of cylinders and their heads. Cyl. get some DOM one inch bore liners for that size piston. Matching one cyl. head to the other. Central spark plug location.

Using a different part number for the Traxxas spur gears and less $$$ at the time ordered. Milling the raised areas on the hub off for flush fit to the webs. 4T less and an eighth inch shorter in diameter. Cutting back the diameter of the web round stock for the fit. Fitted to the backside...

This is a couple months into the build. 4x4 aluminum angle, 4 in. long time 2 pieces. The cylinder hole on the horizontal is offset on the length from center to accommodate the camshafts. Two screw attachment. A pair of valve lifter holes at the front top. Brass lifter body, steel lifter...

Last year's "SPLIT MONO" engine was a unique effort and a successful build. What would a two cylinder version look like? There are two ways to go here......and inline twin with both cylinders on one side of the crankshaft or a cross cylinder design, like an opposed engine with one cylinder each...

Love the slow speeds you can get with air engines and that you can run them inside the house like Stirling models. 👍

I did the Ariel Four cyl. concept a few years ago and it came out well! Incorporating its design in this year's model as a twin with a conventional cam and valve arrangement and is "somewhat" as you described......a twin crankshaft engine!

Some insight from the manufacturer on the design, Tony. https://www.neandermarine.com/a-new-engine-concept-for-the-diesel-outboard-marine-market/

A single cylinder engine with twin crankshafts. This split rods concept actually exists in the marine and motorcycle world.

Ever notice once you get the prototype piece completed......the next two or three pieces take the same amount of time!

Stirling doesn't care what materials you use in your model. You can distort Pyrex glass with heat from an alcohol burner but the engine should run long before with lower heat input. Don't let the 'Thermodynamic optimization" or "high performance" double talk shut your material choice down. For a...

"Reading a bunch of golf magazines does not make one a good golfer" (author unknown). Hello Andrew. You need to dip into a planned single cylinder bar stock model like a WEBSTER. Hands on experience without frustration a good way to get into the hobby. The engine bore determines your scale and...

You can run an I/C engine with a 1x1in B&S with a 2.5 or a 4 in flywheel my experience. Higher compression and/or low RPM's need greater diameter flywheels.

Always a great day to introduce a new engine! 🙂 Welcome to Longboy's 'SPLIT MONO" premier. Another use of my geared together crankshafts successful in four previous builds. In those engines, each crank segment had its own piston. And you can gear 2-3-4 shafts together with only one of...

Play with valve timing Gordon! Looks like your cam lobes are separate from the shaft and anchored by set screws to it. If so, you can retard the valve timing with the same or tighter overlap between in/ex lobes. This helped my engines from spit back thought the carb with marginal overlap...