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I checked again with a cordless drill battery, 18 Volt, 10 A and electrical cables of adequate section but the engine does not turn. When the piston reaches the TDC in the compression phase it does not have the strength to overcome that point. My Knucklehead has a compression ratio 10:1(...

The electric motor that I installed cannot rotate the crankshaft. I was hoping that by powering it with 24 Volts it could start the engine, but a higher reduction ratio is needed. I am waiting to receive a planetary gearbox to increase the torque, in the next few weeks I hope to start the...

I worked quickly because I followed your very complete and precise posts. Thanks for your valuable work

The Knucklehead is running

Yes I know this problem, silicone tubes are not compatible with gasoline. I kept the pump immersed in gasoline for a week, the tubes became softer and sloppy but it still works. I don't know for how long yet. Thanks for your advice, I will replace the silicone tubes with Tygon tubes

Fuel tank and CDI ignition box The tank is made of aluminum, the box is 3D printed The same box also contains the peristaltic pump that supplies fuel to the carburetor, the excess fuel returns to the tank. I can regulate the fuel flow via a voltage regulator. ( 12 Volt)

One of the mistakes I made while building this engine , note the rear cylinder inlet cam with the red arrow. In the drawing I did not put the negative sign in front of the degrees of rotation, the result is that this cam is out of phase, the other 3 are ok. I discovered this by manually...

Oil pump and deep stick For the oil seal I used O-rings instead of the brass rings foreseen by the project Milling of oil pump gears

electric motor for starting Compatibly with the dimensions allowed by the project, this is the most powerful engine I have found. It is a 12-24 volt drill motor, 895 low speed model: 3000 rpm at 12V, maximum torque of 5.2 kg Cm, 6000 rpm at 24V, maximum torque of 10 kg Cm . Engine speed is...

assembly tests of the transmission complete with electric motor

Camshaft Built in a single piece by milling the cams with a T-slot cutter, hardened in water and then sandblasted

The pushrod has a hole to allow to screw or unscrew the ball screw Yes the ball rotates like a ballpoint pen but I don't know if, with a load applied to the sphere , it will continue to rotate, I have to try with the engine running If the balls don't rotate, I replace them with a phosphor...

Pushrod adjuster front and rear cylinder They are made of bronze, I screwed a hardened ball screw into the tip that slides on the cams , I try this solution, an alternative would be to screw a screw with a rounded head made of phosphor bronze , very hard bronze The balls should rotate in contact...

Pushrod tube , from brass rod 2 of these I dropped before taking the photo and are dented ,then they were repaired

Camshaft, pushrod, pushrod tube, lifter guides, the most complicated components of this engine. I made the lifter guides from brass casting, with the usual system of 3D printing of the model, plaster, brass casting to obtain the finished piece with already the holes for the pushrods. only...

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A partial assembly of the engine to check the machined components

Some machining of the crankcase right, left end cam box the red jig it is to obtain the 45 degree angle of the cylinder seats , 3D printed Cam box to get the exact center of the bearing seat on the cam box cover, aligned with the crankshaft bearing seats, I used a center drill...

I leave a sharp edge in the valve cages, lapping with a fine liquid abrasive (grit 800) for 2 minutes with a lapping tool and obtain a good seal. One of the 4 valves took me a long time to get a good seal. The cage had probably been deformed during installation with press, it was no longer...

Mockup heads a first assembly test of the heads with all the brass components, the valves assembled with the springs and seegers, exaust and intake flanges the Draw-Tech design of the valve system I still have to build the final rocker arm shafts then I can move on to the camshafts...