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The complete cylinders, with Viton O'Rings

The cylinders Terry who has already built this engine suggested lengthening the cylinders, to be more similar to the original. In this drawing the black part at the top is the elongated part compared to the Draw Tech project ,of course I also had to lengthen the connecting rods by the same...

Milling of the connecting rods some discarded pieces, I redid the outer connecting rod 3 times due to carelessness

The assembled crankshaft, with an external alignment cylinder during the finishing turning of the shafts . first step, right side second step , left side Final check of the coaxiality of the 2 shafts, without bearings and with bearings Max error detected 0.03 mm

For the connecting rods I provided bronze bushings, mechanically the needle bearing are better, they have less friction, but the bushings are simpler and more robust.

the 2 flywheel shafts have an allowance of 0.5 mm, when they are assembled with the flywhee , connecting rods and the pin , I will do a final turning to ensure alignment and concentricity . The assembly was done with a press. CNC turning of the connecting rod pin the defective pins, 5...

The crankshaft My Knucklehead engine is larger than the Draw Tech project, the diameter of my piston is 36mm compared to 27 mm, 1.33 larger , so everything will be larger than the photos of the components that you have already seen in other constructions. The total displacement of the engine...

It is brass obtained from old taps , I don't know what brass alloy it is, but no particular mechanical properties are required in this flywheel

The flywheel, brass casting

left crankcase

Other aluminum castings, always with the same procedure , 3D project, plastic model, cast in red sand Cover cam box and Cam box

To make aluminum castings the first step is the 3D drawing of the finished part, then I eliminate all the holes and machining, add the allowance in the milled or turned areas, add an increase that takes into account the aluminum shrinkage . Finished right crankcase drawing for casting mold...

The cover are 3D printed, plastic (PLA) . 2 pieces glued together and painted, I had thought about making aluminum castings, too much work, in 2 nights the printer made all 6 pieces . The drawing took more time. Yes it is a petrol tank, even if it looks like an old aqueduct tank ...

After seeing the construction done by Mayhugh, I also decided to build this interesting engine in a slightly larger scale. The pistons of my engine will be 36 mm instead of 1.063 inch (27mm) and everything else will consequently be increased by the same proportion. I have followed and studied...

No, a propeller is dangerous, the engine would still need some aesthetic improvements ,but I'm saturated, I won't touch it again The next engine will be with 2 cylinders maximum.

W engine model 18 cylinders, video of the working engine

After about 4 months of work I completed the modifications to my 18 cylinder and it finally works. I redid the 3 intake manifolds The distribution system has been redone, toothed belts instead of gears 18 cylinders redone Remade 18 pistons Remade 36 piston rings I moved the threaded holes for...

I will certainly follow your advice when I have finished all the modifications on the engine, consider that I have 3 RC car carburetors to adjust at the same time and it won't be so simple, but I will try Now I took the seats for the spark plugs from the cylinders to the heads, so I had to redo...

Important modifications to get a better functioning of my 18 cylinder , I hope :rolleyes: : I would like to put the spark plugs on the heads and no longer on the cylinders, I solve the problem of oil dirtying the spark plugs and I improve fuel ignition. I'm looking for space and the correct...

Hi Pete your suggestions are useful and interesting, I'm designing important modifications for my 18 cylinder , in the next post I will make a list of what I think to do