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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 ****** 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...

Add me to the consensus. I would shorten the valve overlap too.

Just a couple more items to go before the show here. The reliable Tecumseh points set. Cutting off my fuel filler neck. A 2.5 OZ fuel tank on the frame. Going with a vinyl wrap across the top surfaces of frame in satin grey. Undersides in satin black. ☺️ This is what five weeks in...

The lifter bores are located and drilled in the top deck now that the valve block has been placed. Brass lifter guides inserted and locked in with some set screws from the edge of the deck. Forward from the bores a bearing hangs from the underside of deck to support the end of the camshaft...

The fining done on the cylinder and head. A single port entry in side of head covers both intake and exhaust duties to the combustion chamber. A combination valve block meets the head port transversely. A single specialized bolt with the dual purpose of a fastener and a port created...

Thanks Minh. Kinda out of the mainstream from those machinists trained to journeyman standards. Can drift out from following allowable procedures and bring forward a few unexpected custom design, mechanics and innovations to my engines without reference to any plans or drawings. SPLIT MONO...

Google his name for some insight. George went in the other direction for the same recognitions. Where even in the modeling world, larger and more cylinders is the hierarchy.

Thanks Steam. Well I'm getting by drilling needle seats with a #50 drill in the half in. chucks. Sewing needles are for the lower numbered '50s drill sizes, but I can't find a packet of any given needle number. They come as a variety pack and only two sizes within I can use. The rest are...

I like to do forced air cooling if room allows. For my scale, I have a two inch bulkhead connector in black PVC with 2in. aluminum fan from Ace hardware. Back of cylinder drilled/tapped for a 3/ 16 in. shaft after PVC is bored and trimmed for fan and mounting to upper deck of frame. The...

Brian, have you chucked up these pin vices in a three jaw on mill or lath to see if small number drills would run true? Using #50's drills for carburetor jets for the needles and half inch chucks just don't hold the smaller sizes.

You will have no concerns about stem flex if you reverse the procedures describe previously here. You start with the valve head projecting out of the chuck. The valve stem is supported by the chuck. The head is supported by the live center when center drilled. Machine the stock behind the valve...

Building up the lower frame. A couple skid bars tie in the upper component support. Cross wise to these rails, steel foot bars with the rubber bumper feet. SPLIT MONO being a large single has a small footprint upon the table. Going to add a steel plate between the foot bars. The added...

The production con rods are serviceable one at a time without pulling the piston from the bore. They will be drilled for some bushings fixed to the webs and piston for them to swing upon. Doing primary balance. The piston/ rod assembly is heavy, about 2.7oz. vs. around 1.2 oz. for a...