Recent content by Longboy

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...

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...