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| Another version of how not to build a model engine |
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| sorveltaja:
Before making whole new camshaft, I'll try to revive the old one: Rest of the over-filed inlet cam machined off, and new cam blank to be silver soldered: Before.. ...and after cleaning. Cam is now ready for forming: |
| NickG:
S, this might work better by as you say relating the timing directly to engine speed - as long as you get the timing right. Great stuff, fingers crossed it works. Nick |
| sorveltaja:
Forming the inlet cam entirely by filing isn't too attracting option, at least for me, so i made a quick 'n' dirty jig, so most of the excess material can be machined off in lathe: Grub screws keep the camshaft in place, allowing the shaft to be rotated between machining: This simplified jig doesn't necessarily need the tailstock support, as only light cuts are taken. There are no dials to measure the angles, instead I'm going to perform the machining process by following the basic instinct hunch. If it fails, with that jig, it's easier to make new cams anyway :ddb:. |
| John Hill:
If you think there is a problem with the inlet valve maybe it is bouncing instead of closing cleanly? If it is bouncing I think you will see a small cloud of fuel being blown out of the carb? :scratch: I greatly admire your progress on this engine! :bow: |
| sorveltaja:
John, can't say for sure, would bouncing be the problem, as I haven't noticed fuel blown out of the carb, except on cases, if there is impurities in the fuel, that gets to inlet valve, causing it to fail. Usually compressed air is enough to clean the valves. Before next running tests, I'm going to make a fuel filter. |
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