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| Jan Ridders Otto 4 stroke build |
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| dbvandy:
--- Quote from: Da_Kengineer_Meister on March 09, 2011, 03:29:08 AM --- Yeah, Doug, this looks really great! Question about the springs that were to weak... Did they permanently compress / deform after running, or was this their state all along? --- End quote --- These were some stock springs out of a kit. The first ones were probably fine, it turned out to be timing between the exhaust and intake cams, I did not have enough overlap. The second set was a bit long, so I had to lop off a 1/4 inch (I will fix the bottom seat of the spring when I do the polish). The only issue with the weaker springs is that they might float at about 3000 RPM, but I don't plan on having the engine running that fast very often. Nick, The vapor carb if definitely the way to go. It is super simple to make and very forgiving with dimensions. This new one I just guessed at the hole sizes and what felt good, worked good. I like the fact that you can see the fuel through the glass as it makes it easier to explain what is going on to gear head friends that have never seen one (like me until 2 months ago). I will post some more pics when I get her all polished and rounded. More to come... Doug |
| dbvandy:
well... I think I am now done with the Otto and will start spending some time designing the V4. Here is a pic of all the pieces that make up the engine... I did not realize how many bolts were in this thing... that's a lot of 6-32 tapping! The uprights are cut out and lightened. You can see the bearing in the middle upright, that is where the fan goes. The right upright has two holes to mount the coil. I also added some extra holes in the bottom plate to make it easier to get to the cap screws in the top plate from underneath the engine with the allen wrench. It is all back together now and the final touches have been done to the legs and spacers. I built the fan today but it kinda bugs me... it makes some whinny noise (like a fan will I guess...) but it is functional and I will upload some vids tomorrow. More to come... Doug |
| dbvandy:
Well.... I am officially done with the Otto, now it will be a discussion piece on my mantle. The number one question I get it is: "What do you do with it?". To which I respond: "Show it to you..." She runs really well; idles at about 900 steady and revs to 3500 with the softer springs installed. The vapor tank performs wonderfully and the engine will run for 45 minutes on one tank at 1500 RPM. Maximum temperature is 222 F at full throttle for about 2 minutes, but does not seem to rise much after that. The Vitron o-ring seals well and with a little squirt of 3-in-1 oil in the intake valve every 5-10 minutes, stays lubed. Ignition coil with strong neodymium magnets installed on the flywheel produces a strong spark down to about 600 RPM. Fan does circulate air well, but probably is not needed for this motor. Here is a little video of the cooling fan. It is powered by an o-ring on the idler pulley. Thanks for all the kind words and advice during this build, it has been very rewarding to construct and complete. That is all.... Doug |
| sorveltaja:
Nicely done engine you got there, Doug :ddb:. What comes to that "What do you do with it?" question, answer could be: "I use it to ride for shopping". |
| saw:
I will only say :bow: :bow: :bow: |
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