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Hi I haven't given it a lot of thought yet but I think an RC carbs from a 40 or 60 size engine should be ok I will probably make my own carby

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It took awhile to figure out all the angles, the more you do on the cylinders the more nerve wracking it gets, One mistake can put you a long way back

Before I hade surgery on my hand I assembled the parts I have made, there are no sleeves in the cylinders, no pistons or rods installed And it is mounted on a temporary stand just for display Another couple of weeks and I should be able to work on it again

Spark Plugs are made using corian for the insulators, the corona is cut off a piece scrap I got from a kitchen manufacturer, it is the turned down until it is round. The bottom end and the insulators are machined on the cnc lathe The insulator is drilled with a 1mm drill After the end...

This is the fixture that is used to mount the cylinders to the rotary table The rotary table is mounted on to a tilting table, so the rotary can tilted to a 30° angle using a centre drill, drill down until almost all the countersink part of the drill is in the material This countersunk hole...

Making the cylinders I think was one of the most challenging parts of this engine, there are so many set ups The first part was the easiest turning the centre out and machining the fins, CNC lathe was used to turn the fins Internal boring was done on the manual lathe After the fins are...

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The rockers were machined on the cnc mill in the 4th axis this way all operations can be done in one setup

The stanchions were machined on the manual lathe and thread with a dia These are then installed on to the cylinders and a slot is then milled for the rockers The cylinder and head are all one piece on this engine

Valve Cages were machined and treaded on the cnc lathe, then trans fired to the cnc mill to drill the two holes in the top There is a tool that fits over the valve cage and in to the two holes so they can be screwed into the cylinder

I purchased the ring gear for a place in the UK I just had to machine to the right diameter and thickness then drill the holes The other gears I cut my self

Cam gears were cut on the cnc mill, I did not make the ring gear

Machining the master rod, the larger hole is threaded and the bronze bearing the goes in it is threaded also, it has to be made this way because the bearing is screwed in to the rod after it is installed in the engine and on to the crankshaft, because there is no way you can get it on the...

Slave rods were machined on a fixture plate so they could be flipped and the grove machined on the other side

To machine the cam I made a fixture plate so that I could machine one side and them flip it over and machine the other side

Bearing retainer is to house the rear crankshaft bearing and also to secure the ring gear in place The part was turned on the lathe and then finished in the mill

Finishing the crank shaft, I made jig to hold the shaft in the three jaw chuck and turned the small end Then I machined the counterweight that is silver soldered on The counterweight is pined and then silver soldered

The distributor and gearbox is my own design as others mentioned this was originally designed as a glow plug engine, that would be the reason the intake is through the crankcase to lubricate the bearings I think if the through the crankcase intake doesn't work very well it would not be to hard...