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I could harden the cams, they are built with C40 steel material which is hardenable in water or oil after heating to 850 degrees C

Hi Michael the cams do not have a very high roughness , they are not ground and polished as in racing engines , but I believe that to work a few hours during the entire life of this engine , they can be acceptable. I could also temper them to harden and polish them with sandpaper, but my...

The heads assembled with rocker arms, camshaft , camshaft supports and 1:1 ratio gears rocker arms left and right

Valve lapping and control with vacuum pump, 36 valves, real boring work. A first rough lapping was done with valves and cages not yet assembled on the heads, I pressed the cages into the holes of the heads with Loctite 620, I drilled the exhaust and inlet holes and then I did a finishing...

Heads, valve cages and valves are assembled , after the assembly I made the inlet and outlet holes, both with housing for orings

My next project? A much simpler engine I'm thinking Fairbanks Morse 2-3 cylinder. Does anyone have drawings or photos or dimensions of this 2-stroke engine?

Hi Michael, for the last engines I built (Porsche 917 and Bugatti T50) and also for this engine I used high speed steel turning , 36SMnPb14 , this steel, despite the lead, is hardenable with good hardness. This engine doesn't have to fly in an airplane, so no quenching is needed. Valves have a...

Valve turning and valve cages

The drive system from crankshaft to camshafts

The three heads, each for 6 cylinders I used a rectangular aluminum bar, each head has 103 holes, some holes like those of the valve guides required 3-4 drilling with drill bits of different diameters, particular precision is required for holes of the valve cages which are inserted using the...

The bottom of the socket is spherical made with a ball end mill , but it could also be conical made with a drill bit, maybe it works better The pin is hardened, diameter 2.5 mm x 12 mm, it is commercial and can be easily purchased at any screw dealer , it is not a spring pin, not very resistant...

Rotation transmission from timing gears case to camshafts Failing to guarantee perfect coaxiality between the 3 output shafts of the timing box and the bearings on which the bevel gears are mounted which transmit rotation to the camshafts , I had thought of using small joints used on RC toy...

I covered the model with Petrobond sand in the lower drag, pressed the sand, turned the flask 180 degrees , dug out the sand on the inclined planes, covered the sand with talc, put the upper flask, filled with sand (Petrobond), pressed and, removed the cope, removed the model, poured molten brass.

I know the problem, PLA is a hygroscopic material, the more time passes the more it absorbs humidity, but I want to do a test, this distributor will be used on my engine in over 2 months, if it doesn't work, I'll make it again in Delrin like all those built up to now. In reference to water...

Hi Jens , same question , what do you think of my blue distributor ? Will it work???

Hi Peter , what do you think of my blue distributor ? Will it work???

Distributor cap for 18 cylinders, (6+6+6 on 3 levels) I was inspired by the distributor of an old Ferrari 12 cylinder, 6+6 on 2 different heights , i added a level , so 6+6+6 on 3 different heights to avoid the spark jump in the wrong contact , the distance between one contact and another is at...

Aluminum casting instead of PLA

I drew the timing gear box 5 times before getting a definitive solution , every time I printed it with a 3D printer, I mounted bearings and gears, made functional and assembly tests, up to the final solution. the 5 versions , PLA the final version

I preferred to do the 1:2 reduction directly after the crankshaft to halve the number of revolutions of the transmission shafts arriving at the camshafts and therefore less noise. My gears are low quality, not ground on the teeth and alignment is critical. In the original engine the 1:2...