Search results

Yes , I used the inside of the 3D printed mold to make the sand core and the outside to make the footprint in the petrobond sand, this was possible because the angle of the internal cone is large , it was not even necessary to paint the mold The layer thickness was 0.16 mm

The finished brass cone

My garden foundry is open, the first brass casting To support the shaft that drives the propeller I designed a cone for the ball bearings. I made the mould with the 3D printer , I made the internal core with sand, sodium silicate and Co2 The core still hot molten brass

Using a new disc would be a waste, I used a worn disc from my car. I got it from the repair shop that does my car maintenance. A friend of mine made it perfectly flat by grinding the surface, at no cost . Also the electric motor with worm gearbox is used, paid a few euros.

43 finished piston rings, ready to assemble

My surface grinder for piston rings I built myself this little surface lapping machine , the rotating disc is a brake disc driven by an electric motor with worm gear , naturally the surface of the disc was made perfectly planar. I can lap 9 rings at the same time, I put 320 grit silicon carbide...

I will get a really small gap with a diamond file, in my humble experience after a few minutes that the motor is running this gap widens. Our cylinders and piston rings are not hardened :rolleyes:

yes , I could have compressed the rings to make them more locked, in reality I have slightly glued them on the outer diameter with cyanoacrylate, after having compressed them with a spacer and tailstock. After the internal turning some heat released the rings. I believe that the rings must have...

Polishing of both sides of the rings and final inspection, more than 50 piston rings with the known method of light I checked all the rings, it looks amazing, but zero rejects The real final test will be the compression test once the pistons and heads are installed. In the photo only some rings...

Third step internal turning to separate the rings Fourth step Rings cut I slipped the rings on an alignment pin and they were compressed in the vise Fifth step Finishing turning of the outer diameter by means of a tool fixed on the spindle, perfectly concentric with the rotation axis, a...

Second step I turned the piston rings leaving a small stock of 0.03mm on the thickness of the rings, necessary to polish the 2 sides with sandpaper and WD40. I left the rings joined by a thin thickness on the internal diameter, so as not to leave burrs.

Piston rings To build these rings I did not follow the Trimble method because in previous experiences I had a lot of waste , after heating. I wanted to try the method without heating of which I have seen videos on Youtube and I have read some explanations. I used Nodular cast iron or Ductile...

yes correct, I don't know after how many hours the engine has be running the contact area will extend but it will happen

the material of the valves is 36SMnPb14, an easily machinable steel but which contains Carbon and Manganese which make it resistant and also hardenable in water or oil. Each roughing stepover is 0.3mm and 0.15mm finishing passes with repeat at zero stock . I didn't take a photo, but before...

Yes, I will do the grooves for OR later, first I have to weld the water inlet and outlet pipes to the water jackets. They are brazing on aluminum, I have never done brazing on aluminum and I don't know if there will be deformations or defects. In this case I will have to put OR with a larger...

Hi Steamchick , thank you for your suggestion I turn the valves 44 degrees and the bronze seat 45 degrees, then lapped with silicon carbide and WD40 In case of problems of leaks, I go to the house of a friend of mine who owns a Dekel like this one and I grind the 44 degrees surface. It is very...

I turned the valve with 4 successive steps in order not to deform and bend the stem. The valves have a 3 mm diameter stem and a 9.6 mm diameter poppet , the diameter of the raw bar is 10 mm 40 valves on my little CNC lathe , I bought this lathe from a school, price 200 euros. Is very old but...

The camshaft and rocker arms must have a support flange which also supports the bronze bushings. These support flanges (blue color) are fixed in position with two M3 screws, I created a small enlargement at the base to have a better support , the biggest difficulty is that all the seats for the...

I also joined the two exhaust and intake cams in one single piece, the 2 cams are rotated 110 degrees to each other (red is exhaust, blue is intake) , each cam operates one rocker arm, one left and one right, each rocker arm has a valve clearance adjustment screw for the milling I used a...

Cams and rocker arms This engine has overhead camshaft, it is a DOHC engine. For simplicity of construction, I have designed a single camshaft for each head with the exhaust and intake cams on the same axis, contiguous to each other, each cam has a rocker arm. my design