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  1. josodl1953

    The restauration of a Nova 1 4,5 cc model diesel long stroke engine

    This brings back memories, I got my first model engine from a schoolfriend back in 1967. It was a E.D. of about 1 cc. There were parts missing, the cylinder head with tommybar, intake disc, carburettor and tank.I ordered them from the Suls company, a name familiar to older Dutch modelers.I got...
  2. josodl1953

    piston skirt relief

    For milling the inside of my Edwards pistons I made a fixture ( one of the many for this build). The I.D. is slightly undersize, the screw in the middle is for opening the clamp so the piston can be placed. This screw is removed prior to clamping the fixture in a vise or whatever tool is needed...
  3. josodl1953

    The restauration of a Nova 1 4,5 cc model diesel long stroke engine

    Hallo Gerard, Ziet er interessant uit. Is dit een produktiemotor of een enkelstuks? I think most viewers don't speak Dutch so maybe you should write your posts in English like you did before. If the engine runs maybe you can post a video? Just beware of backfire, 4,5 cc is quite large for a...
  4. josodl1953

    piston skirt relief

    This is what modern pistons look like (Mahle) About piston distortion: you should bear in mind that the piston rings provide the seal in the cylinder, not the piston circumference itself. Therefore it is not necessary to lap the pistons in the cylinders, the pistons need (very little ) room in...
  5. josodl1953

    Forrest Edwards radial 5

    Hi Awake, the sandpaper is held in place by the ring only, the bolt in the middle is for keeping the hollow shaft for the disc in place.
  6. josodl1953

    Forrest Edwards radial 5

    This is how it works. It sounds a bit wacky but it does the job.. Jos
  7. josodl1953

    Forrest Edwards radial 5

    I'll give it a try..
  8. josodl1953

    Forrest Edwards radial 5

    With the pistons complete I went on to the piston rings. Having made the ring grooves a bit narrower I could use previously rejected rings that were too thin. This meant that the thickness had to be reduced form 1,00 mm to 0,80 mm. Doing this manually would probably result in a lame hand so I...
  9. josodl1953

    Forrest Edwards radial 5

    After measuring the wall thickness of the piston crowns I found out that they were... well, a bit thin, the thinnest measuring 1,7 mm. Whoops.... Now I can fit them in the engine and see what happens but I'd feel more comfortable if I would know that these pistons could withstand the pressure...
  10. josodl1953

    Forrest Edwards radial 5

    Just finished 5 new two-ring pistons. On the subject of piston rings: I wonder whether old brake cylinders could be used to make them. The material is cast iron and is easy to machine. Old brake cylinders can be obtained at any scrapyard for next to nothing ( or nothing at all if you fix...
  11. josodl1953

    Forrest Edwards radial 5

    Yeah, that is what one would think but.. it is extruded bar stock. I do not know where it came from but it is very brittle. At the start of the Edwards project I tested some alloys with a home made tensile test device. Is is just a lever with a sliding weight using test bars with a minimum...
  12. josodl1953

    Forrest Edwards radial 5

    After a month or so working on my hibernating Honda CX 500 , I turned to the leak problem of the pistons. Compression cold is not bad, starting with an electric starter is a piece of cake, and still there is the problem of dying out at full RPM, combined with excessive blowby from the crankcase...
  13. josodl1953

    Edwards Radial5 converted to metric

    What about a screenshot ?I made screenshots of the Edwards PDF drawings and thus converted them to JPEG. Then I made modifications, remarks etc. with Paint which is , sadly, no longer supported in the latest versions of Windows. See example below. Please note that the metric dimensions apply...
  14. josodl1953

    5 cyl OHC Radial.

    Peter, So far I found no adverse running effects of the equally-spaced link rod pins in the master rod. The drawing of the cylinder liner ( the Robert Sigler version) specifies trimming of the liner top to achieve equal CR for all cylinders. I myself adjusted the CR by trimming the piston...
  15. josodl1953

    Sun-Planet Engine

    Not to mention the endless law-suits that Otto conducted against anyone that built an engine with only a vague resemblance to the four-stroke engine he designed. Jos
  16. josodl1953

    5 cyl OHC Radial.

    Hi Brian, nice to see you back on track. Jos
  17. josodl1953

    Werowance attempts Upshur Vertical Single

    I think it depends on the aluminium quality you are using. The original Edwards radial 5 design specifies both valve guide and seat to be machined directly in the 7075T6 aluminium heads. So yes, aluminium valve seats are definitely an option if you can machine them in one operation with the...
  18. josodl1953

    Forrest Edwards radial 5

    Hi Mauro, Typically, four strokes require much smaller carbs than their two-stroke counterparts. I looked up the recommended carb size based on the internal dia of the Edwards manifold flange, being 0,437". This is from the official Perry website: Carbs this size (2100) are intended for .21...
  19. josodl1953

    Forrest Edwards radial 5

    Now that the end of the 2019 is approaching, it is time to evaluate the build of my 80% Edwards radial 5. First of all, the positive aspect is that I got it running. A less positive point is that I could not let it run at full power because when I did it died slowly. I could keep it running...
  20. josodl1953

    Complete Model Engineering Shop

    Hello Jenny, I'm sorry to hear about your back problems and giving up your hobby. I informed Robert Daniel of the Bridlington Model Boat Society about your "sale". He would inform his fellow members . Now model boat builders often use wood but it's always worth a try. I wish you all the best...
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