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| Jan Ridders Otto 4 stroke build |
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| dbvandy:
--- Quote from: madjackghengis on March 05, 2011, 10:19:33 AM ---From the way it runs, Doug, I'd think about making an actual carburetor with fixed jets and actual fuel control, so as to get the full range of rpms. You might inset the magnets into the flywheel, rather than leave them outside, and thus need less work to balance it out. The key is the magnets switching the flux precisely at the same time each time, and that is controlled by their placement, which being fixed, means it should be possible to put a key in the flywheel once the timing is perfected. You definitely need to have valve overlap if you're going to run it at any significant speed, to avoid the pressure build up you speak of. I've got a copy of Jerry Howell's carburetor he designed for small engines, as part of my radial engine plans, and his carburetor will give good control and has an idle jet and all, basically a real and complete carburetor, and not too complicated. :bugeye: you've definitely got her down to just working out the last little bugs, fine job, all the way. :headbang: cheers, Jack --- End quote --- Thanks for the suggestions.... I have some smaller magnets that will fit into the flywheel by just drilling some holes, so if I go that route with the ignition coil. I do not have a method for broaching the keyway right now, though I could do a piece of round stock and drill a hole between the shaft and the flywheel just like a square key would be cut. I would love to take a look at those carb drawings to see if it would be a good fit. Can you send a copy to dbvandy@gmail.com? I will keep updating the build as changes are made. More to come... Doug |
| sorveltaja:
Dbvandy, grats for getting the engine to run :beer:. What comes to carburetor, as a shortcut, why not to try commercial one, as Webster's designer suggested on his engine. But anyways, it would be worth to make a homebrewn test carburetor, to see, what the engine likes. Even if it is a shot in the dark. |
| dbvandy:
I have two OS carbs from my old RC days. I had them on the webster, but they seemed finicky and hard to adjust. maybe they will work better on the Otto... I will try tonight... |
| dbvandy:
FYI... 1/4inch clear vinyl tubing melts at exactly 222 degrees F.... That is all.... |
| dbvandy:
Well... I had her up to 5600 RPM today running really smooth... Idles about 800... I tried to use a carb off an RC car with about the same results as the webster... bad... I whipped up a quick adapter for the 10mm carb The carb installed... it ran, but either idled or sputtered to 2000 RPM then died. after about throwing it across the room in frustration, I put the vapor carb back on. I love that thing... I did play around a bit and ran the engine on propane and some other stuff... maybe I will make a demand valve and run it off a bottle... This week I plan to finalize some things... glass vapor tank, and ignition (coil or piezo) More to come... Doug |
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