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keuk

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  1. keuk
    Still on development , all the advises are of course welcome, right now it's just an original casing whith the standard thickness, crankshaft room, bearing. The transferts are bigger, and of course, as you can see there is an access to the gearbox.
  2. keuk

    Radiale Bremspumpen

    keuk antwortete auf Mike's Thema in Technik allgemein

    What kind of braking fluid can I use with the Stage6 4 piston caliper ? Dot 4 or 5.1 ?
  3. keuk
    Is anyone using a steering damper on his racer ? Do you have advices, pictures of your assembly ? Thank you.
  4. keuk
    I realize that I had the same question about the compression ratio found on the SCK blog. I did the test on a 3D model considering a squich of 1,2 and the bump of the piston head and the exact geometry of the cylinder head, and i'm more close from the polini data sheet. I found 13,4:1 for my 53 and 13,0:1 if I change for a 51.
  5. keuk
    That's interesting ! One question, on the blog link, for the volume found on the new and the old polini cylinder head, on the old model there is a gap after the squich band on the new model there is no gap, is it really comparable ? Shouln't we use the squich value for the volume of the head to make the ratio? Sorry i'm novice for with this compression rates.
  6. keuk
    I see that you are talking about the compression ratio, Is it important to change it if I use a 53 stroke instead of the 51? I didin't modify the geometry of my cylinder head on my evo.
  7. keuk
    I have a theory... I have compared the sprinter and a standard mazzu on illustrator.. The moment where the path for the gas mixture is fully open is very late on the Sprinter, the piston is near the TDC, and his linear speed is very low, so the volume of gas mixture that is sucked at this moment is reduce. Ok the mixture can enter before but not with a good flow. On the mazzu, when the path is fully open, the piston still have a good linear speed, and the volume that is displaced is bigger. Ok there is nothing really new, but I should maybe look on this side, adding a big chamfer on the DRT or using a mazzu, no ?
  8. keuk
    Yes it should be interesting to make this new tests, I keep that in mind for the next time, I should proceed more methodically, last time I had access to a long period to the dyno, I only focused on the main jet to gain few hp from 18,.. to 21. It's a bit frustrating to realize that I had the same power with an iron polini, a bent standard 51 mazzu, a throttled exhaust port, a small koso 28 with mini tassi and a longer transmission ... Dammed
  9. keuk
    I'll try a 35 and a new exhaust. I'll also reduce a little bit the squich, I have 1,2mm right now. Here is the curve of this week end.
  10. keuk
    Thank you for the reply, I'm tempted to try a bigger carb and another exhaust but what about the crankshaft ?, isn't the DRT sprinter too restrictive for the mixture ? Is there a better solution available on the market ?
  11. keuk
    On my racer's evo with 127/192, DRT sprinter 53/105, Keihin 33, 70%, franz, vespatronic, I have 21HP at 8800 and the engine doesnt' go further than 10200, that's quite good for racing but I would like to understand how some of you can achieve a way more hp than that, I think I saw a 30hp on this thread. To go further, is it necessary to modify the portmap of the cylinder, and to increase the height of the intake transfert in the barrel to increase the volume of gaz that can enter in the barrel ? What could be the most efficient point to work on, the crankshaft ? Remove the quicksteel in the casings transferts to increase the volume ? increase the diagrams ? Try another exhaust ? work on the compression rate? Here are my last year curves, I made a dyno test this week end without improvement, I had optimized the exhaust port and the intake. (I will upload the new curve later). The dyno is a softengine, it's a bit more severe than the P4, apparently 1for10hp.
  12. keuk
    I have added a RS24 on the googledoc link.
  13. keuk
    The mudguard is exactly the same than the original, I have only enlarged the shock absorver area on the right side, so yes it's a bit asymetric but I kept the rib so that it should look nice.
  14. keuk
    I found this on grabcad, http://grabcad.com/library/honda-nsr-125-jc20-engine-top-end-1, nothing to do with Vespa, but this is crazy ! http://grabcad.com/marcos.armero/projects
  15. keuk

    Engine casings

    keuk antwortete auf keuk's Thema in CAD Daten

    It's just for fun, a kind of cad training. It would be a too big investment, not very interesting with all the solution already available for this niche market. Plus it would be a bit prententious with my small engine background. For the reed this one is already too big, it's wouldn't help solving my problem. For the other suggestion, yes maybe later.
  16. keuk

    Engine casings

    keuk antwortete auf keuk's Thema in CAD Daten

    I kept going on the casings but I have a problem with the carburator that touches the shock and the casing? If I want to keep a standard shock I have to turn the carburator and it touches the flywheel area, and it will dicrease a lot the airflow if I increase the bump on the casing... I need to find something else... I was hesitating on inclining the cylinder more (like a px) to gain room ?
  17. keuk
    You're right Polini wouldn't be happy to find fake files on the network for product that are still on production. As for the Chinese I don't know if this kind of file would really help them, they usually prefer to rebuilt a model from the beginning. I'm going to resctrict the sharing to here with a google doc link for the Vespa stuffs.
  18. keuk
    But with a nicest exhaust port , I did everything with a digital caliper.
  19. keuk
    Here: https://drive.google.com/folderview?id=0B4bDFY32byLjWDB3TTdMWDZsV2c&usp=sharing
  20. keuk
    Hello, I'm working on an enlarged mudguard for smallframes. The main idea was to create a good 3D model, to make it machined using polyurethane foam to create a master and then create a fiber model. If someone is interested by the project, I share the 3D file. It's not a definitive model, I still have to check if it is enough enlarged to fit a racing shock on pk steering column. Don't hesitate to post your comment to make it evolve. You can find the 3D files here: https://drive.google.com/folderview?id=0B4bDFY32byLjTDlXOEFuZVhPWG8&usp=sharing
  21. keuk
    Anyone knows the size of the thread ?
  22. keuk
    Hello, Can I safely remove the bracket of the BGM rear shock ? There is a seal so I was a bit hesitating. I would like to make a new bracket like on the new models for PV to move it a little bit more to the rear so that it doesn't touch the selector screw.
  23. keuk

    Engine casings

    keuk antwortete auf keuk's Thema in CAD Daten

    Nice job, is that you ? http://grabcad.com/library/stock-vespa-flywheel-mod-with-polini-evo-ignition-fan
  24. keuk

    Engine casings

    keuk antwortete auf keuk's Thema in CAD Daten

    Many thanks, I knew I had seen it somewhere !.
  25. keuk

    Engine casings

    keuk antwortete auf keuk's Thema in CAD Daten

    Another model with a read intake and a VHSB found on internet.
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