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Recent content by leerkracht

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  1. leerkracht

    straight 6

    the v12 of 180 ° runs uneven on idle because it was the first run of this engine , so completely new and not yet properly settings of the carburator and run in , now this engine runs very smoothly over the entire rev range.800-3600 rpm under load of the 4 bladed prop wiht a 3 blade or 2...
  2. leerkracht

    straight 6

    cam shaft info gr
  3. leerkracht

    straight 6

    Radical timing ? the effective timing of the camshaft you need to measure with the clearance from 0.05mm to 0.1mm , you have a lot les timing with these small lobes (make an assembly > inventor and see the result with different clearences )
  4. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    Wonderful work one remark , don't forget to harden the camshaft lobes , otherwise you will get a lot of wear and tear very quickly and all the debris will end up in your crankcase and oil with the known consequences.also use hardened ( Stubbsteel ) and polished cam follewers it takes less...
  5. leerkracht

    making piston ring for Corliss Steam Engine

    I used the method from George Trimble for over years now with 96% perfect rings , good sealing from the first stroke , i lap the bore of my cilinders (from nodulair cast iron GGG40)(meehanite) instead of honing them a new made engine runs from the first of the second flip by hand ( propeller )
  6. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    look at this site lots of information https://steelnavigator.ovako.com/piston-rod-predictor/ https://steelnavigator.ovako.com/heat-treatment-guide/ https://steelnavigator.ovako.com/
  7. leerkracht

    making piston ring for Corliss Steam Engine

    The rings are old style 1/8 3.175mm is to much , smaller rings perform better and wear less (ring and cilinder ) 1mm is better , modern (race) engines all uses small rings you can cut ist at an angle if you wisch
  8. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    Hello These inductif hardened rods can be drilled with normal HSS drils ( i prefer HSS Co 5%) for lengtening i prefer grinding https://www.thn.nl/contact
  9. leerkracht

    Bugatti straight 8 cylinder with blower, design, 3D printed molds, castings , machining, assembly

    Piston wrist pin to make piston shafts I use inductively hardened shafts that are available from diameter 3mm (less than 1/8 inch) in inches from 1/4) the advantage is that the core is still soft, the outside is hardened and ground to h6 tol , is round, straight and cylindrical. to protect the...
  10. leerkracht

    cnc engraving recomendations

    Not a D-bit but a real milling cutter https://www.hoffmann-group.com/BE/nl/goeddesprl/Monoverspaning/VHM-frezen/VHM-graveerfrees-60%C2%B0-ongecoat/p/208040 https://www.verspaningonline.eu/assortiment/vhm-frezen/micro-frezen/micro-radiusfrees-vhm-dynastar
  11. leerkracht

    Balancing a Radial?

    look the article balancing of radial engines part 1 (google search)
  12. leerkracht

    cnc engraving recomendations

    a carbide radius cutter of diameter 2mm gives very good results , by varying the depth you can adjust the engraving width , start with a depth of 0.001 inch >rpm maximum the higher the better. the feet supply is of course dependent on your rpm, feet per revolution 0.002 inch (cutter with two...
  13. leerkracht

    Split bushings

    Two piece bearings turn with oversize outside / undersize inside split / mark the parts , polisch the faces , glue white good quality thin ca glue polisch the faces flat, make a mandrel, clamp with bolt inside turn the outside to size possibly the groove to size, make a pot chuk where the...
  14. leerkracht

    Spark plug boots

    Just my way gr
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