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| Jan Ridders Otto 4 stroke build |
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| dbvandy:
I got all three uprights made, bearings in and some 40mm plate spacers roughed out. Now it REALLY looks like and engine... More to come tonight... took Sunday off to go play... Doug |
| dbvandy:
Well, everything is mounted solid now and only a few things left to do. I might be making fumes this weekend... I made a center line on all the uprights and one down the center line on the base plate, lined them up and transferred the holes in the uprights to the base plate. After the 3 back socket heads were in tight, I did the same for the front. I had made the spacers for between the uprights last night and you can see them here. Also, the 4 corner post and tapped and mounted. The crank bearing mounts are marked with center lines as well and the hole locations are transferred from the base plates just like the uprights. I changed the design a bit here: the flywheel side is smaller so that I could mount the uprights from the bottom. This will not effect the operation in the slightest, but if I need to make alignment adjustments I can just oversize the holes in the base plate. The crank side is extra thick because that is what size stock I had in the drawer. I decided to drill and tap a hole into my drill press table as a pivot for the cylinder hole and a 3/8th 4 flute end mill to plunge the stock out. Worked pretty good. for those that are wondering... the chuck is heated and locktited on to the arbor. (I hope I never need to get it off.) The 1/4 -20 bolt was threaded through the table and then nylocked tight. Most of the stock was plunged out and then the base plate was spun to even the sides. Turned out pretty good... the hole was then drilled out with the unibit (still love that thing...) Here is where we are tonight. On the agenda for tomorrow: crank, cams, and intake/exhaust manifold... more to come... Doug |
| NickG:
Absolutely flying along. Nice innovation cutting the large hole out. It's a fair sized thing this one too ... Nick |
| dbvandy:
Well, finished the crank bearing blocks, crank, and cam blanks. I cut the cams from 1 inch 4140. The OD is 24mm with a 17mm hub. I will cut the cam down to 20mm by removing the extra stock with the 4 inch belt sander down to the 20mm ledge I left on the hub side. Both cams are 11.5mm which is the same distance as the valves are apart. The crank shaft is 8mm from an old Lexmark ink jet printer. I left it long so that I have options when it comes to the final flywheel design. I put 2 bearings on the crank side and one on the flywheel side with an aluminum spacer in between. The holes have been drilled into the head for the intake and exhaust. The valve guides were high temp red loctited in (hope I never have to get them out). Tappets and guides to be made after cams are ground. As she sits tonight... left to do... grind cams... Done tappet holes and press in bronze bushings... Done tappets... Done Intake/exhaust manifold muffler flywheel (faceplate just arrived from LMS today)... 75% done wrist pin in piston mill slot in base plate for belt design ignition system (got the tazer yesterday... don't think it will work, does not seem to recharge fast enough... bummer...)... 25% Done design carb (have some really cool ideas....) Belt and pulleys purchased from SDP/SI, should be here next week. I hated to spend the $$$$, but had to be done... More to come.... |
| saw:
It's looling amazing :bugeye: |
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