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| Jan Ridders Otto 4 stroke build |
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| dbvandy:
--- Quote from: NickG on March 01, 2011, 01:33:15 PM --- On the wrist pin, I usually make it a tight fit in the rod so the pin always stays central with enough clearance so that it never touches the bore - not sure whether it's good practice or not but seems to work. Nick --- End quote --- I think that approach is probably fine. The webster plans even call for some 4-40 set screws to lock the pin in place. 4-40 and smaller are too hard to tap IMHO... all that work to pop off a tap in the piece right before installing... ouch... I will let my brass pin float. Doug |
| DavidA:
Just thinking about that piston pin (Gudgeon pin as we used to call them), I suppose that if one was very careful then one could machine a groove at each end in the pin hole (like the circlip groove in the full size pistons) and fit a tiny spring clip, say, a turn off a coil spring. That would solve the problem. Could be fun holding the piston whilst you do it though. Dave. |
| dbvandy:
--- Quote from: DavidA on March 02, 2011, 07:16:29 AM ---Just thinking about that piston pin (Gudgeon pin as we used to call them), I suppose that if one was very careful then one could machine a groove at each end in the pin hole (like the circlip groove in the full size pistons) and fit a tiny spring clip, say, a turn off a coil spring. That would solve the problem. Could be fun holding the piston whilst you do it though. Dave. --- End quote --- Seems like you would be able the hold it in the 4 jaw. On the webster I spent about an hour pondering just that for some tiny tiny internal cir clips I have around. A coil of a spring would work better. Doug |
| dbvandy:
Well, I am officially out of things to do until the lighters arrive. I will probably work on the vapor tank tomorrow, but I plan to use the one off the webster in the beginning. I plan to put a belt powered fan on the engine after she starts running. Might not do much, but will look cool. The round groove will have an o-ring the will be connected to a small shaft, thus giving about a 1 to 10 ratio, driving the fan fast. The pulley is adjustable along a slot to tighten the belt. You can see the o-ring waiting to drive the fan.... Engine as she sits tonight... And a little video showing the compression and valve action. I have just eyeballed the timing for now, will get it right later... More to come... Doug |
| NickG:
Looks great Doug, can't wait to see the fan, like the pulley idea it will add more visual appeal. Nick |
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