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I would consider the intake and exhaust passage diameters which are normally reduced to scale along with the cyl. diameters to scale, maintaining a proper flow charge to the cyl. per cycle where a variance will not affect the operational range, RPM or smoothness. Also per previous post, the...

Thanks Xander. A one inch bore and stroke for The SILO engine. I would say that physics remain the same regardless of bore and stroke for running reciprocating engines at different scales. You may be more in concern for rod length and angles rather than B.& S. sizes for the physical limitations...

Our low performance engines will run fine. A single cylinder engine the best test bed to play around with combustion pressures. I find that a higher compression just makes the engine too hard to hand start and is harder on the engine overcoming the up strokes. It better be clamped down to a...

Possible lubrication issue? Are you leaning to a dry bearing grabbing the throw and twisting it off?

Hello Minh. Can get overwhelmed with assistance / solutions by others and mixed in with such disappointments as time making a 4 cyl crankshaft to see a major part go away in a few minutes of run time makes a hard day. The cause unknowns make for a lousy day too. So I believe your design is...

Expanding on an iconic model engine design.

https://en.wikipedia.org/wiki/Česká_zbrojovka_Strakonice

Not true of course....per your own research. Seems like petro chemicals cover both ends. Either as a lubricant or a solvent. Now about those cars that run on water.............

Thanks Xander. No need for considering the added volume of the tubes to the combustion chamber volumes. The brass tubes are 5/32in O.D. and the length per cylinder is approx. 6 inches. (3 in. each tube). The formula for tube volume comes in at around 1.3cc/ cyl. for the tubes substracting the...

I would say you are pretty much on target time wise on your Pioneer. You will find a couple weeks in there that parts made went quicker than you thought they would! I spend 1-5 hours daily. Some of that time is thinking ahead a couple steps and just sitting at the bench before cutting up stock...

WELCOME TO LONGBOY'S PREMIER OF THE SILO MODEL GAS ENGINE! 👏 👏 👏 SILO turned out pretty good for me. Only thing new in design was the placement of the valve blocks adjacent to the cylinder deck and their plumbing routes up to the heads. SILO was started the 1st week of Febuary. And...

Cylinder heads same diameter as cylinders. Just a sparkplug on top and the profile presented is somewhat of a silo with filling chutes. For those who have not seen the business side of geared together crank webs. To vary the gear lash to prevent binding or clatter in operation, one of the...

The tough part on the build was bring up the connection from the valve blocks into the cyl. heads. Just not going to come straight up and curve into the front and back of the heads. I had a couple of these 1/8 in brass compression fittings in a tray. Re-drilled them for 5/32 in. tubing, the...

The black diagonal object is a frame brace. Two flats bolted together will flex more than real angle pieces and the horizontal component with the cylinders firing off shoots the stabilities away. Mounted between the cylinders....even this brace was not enough to quell the diving board action...

Tecumseh points set to the lower deck vertical. Convenient wire connection right at the frame edge. The crank webs are low in the frame and the cylinder deck is high. Connecting rods end up longer and the reciprocating assembly is heavier then. The brass counterweight on the flywheel...

Square tube steel butts up to the vertical with brass bushing and shaft. Picking up the drive with .5 Mod, 24T brass bevel gears. Cam lobes slipped on shaft and somewhat centered with the cylinders topside. Top of tube trimmed away, A 6-32 socket head fastens the assemble to the deck and SILO...

The short deck gets one bearing carrier as #2 cylinder gets the shaft for the flywheel. Upon this shaft goes the points cam and the MXL cam drive 20T sprocket. Between the bearing carrier and the sprocket here will be a brass eccentric to balance out the piston/rod assembly on the crank web...

The frame up for SILO is the same as four other models of mine. A short lower deck piece of alum. angle backside and a tall angle piece for the cylinders. Out of the 4 inch angle stock, I do a ninety deg. mate of two quarter inch flats for the cylinders and bearing carriers. The vertical...

This image giving me and inspiration for a new model. 🤔 ....exactly how far can you place those valves from the combustion chamber anyway? The SILO engine build coming up soon! 🙂

I like this solution of a clamp collar bolted to the hub. You can up size the hub screws to #8's for some more security.