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Sometimes the near surrender of building models comes not during its construction but in its troubleshooting afterwards. The weak link in the T.R. engine is the bevel gears. When the death clash occurs the engine goes outta time between the two cylinders and time to take it apart. After about...

Here is the only video of TWIN REDEMPTION in its original configuration running............... It has problems and I cannot prove the engine at this time. :eek: Gear clashes and broken roller bearings. My troubleshooting, possible remedies and alternatives to save the T.R. engine coming up!

TWIN REDEMPTION was completed the first week of March. Looking good to me. Now time to prove the engine and see what I got...................

Outside vertical face and top deck of the 4x4 angle piece get the satin black. My fuel mixer and manifold at the front top of the engine between the valve blocks. 🤔How do you join the carb to the valves? Fuel line tubing! My sparkplug caps now home made, work well. Ign. in place as...

You are a great candidate for the WEBSTER model engine when you get your machine tools.

A little reduction on the engine width cutting back the horizontal on the 4x4 frame members. About 3/4 inch. A better proportioned component now. Setting up the frame base. Either the parallel steel bars along side with the output shaft..... .......Or running along side of the web shafts.

That is the correct solution to resize mis- sized threaded holes. Especially into the combustion chamber, an oversized threaded plug with a sealant. This also works if you need to relocate off your original spark plug position or change the spark plug angle into the chamber when you redrill and tap.

Between the gear and bearing carrier, some Delrin/ stainless washers for thrust control on the shafts. The brass bushing sits in a roller bearing and is tightened up against the face of the web. I wrap the spockets with an unused belt cut in half and take a tooth count. Match that up with...

🤔...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!