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| Three Cylinder Radial Engine |
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| NickG:
Really nice that Stew, it looks fantastic. It's quite a size too, what is the bore and stroke? Nick |
| sbwhart:
Hi Nick 5/8" bore * 1/2" stroke, Bothe the elmer design and the Royal have the same bore and stroke, the main diference between the two is that the Royal has a bigger crank case, and the con rods share a common axis. Cheers Stew |
| NickG:
Stew, thanks for that. Sounds like it might be pretty powerful and high revving. So it has some sort of rotary valve does it? Nick |
| Brass_Machine:
Wow Stew... That is looking nice! Eric |
| sbwhart:
Thanks for your kind comments Chaps. Nick its got another prort face that sits over the galeries in the crank case these port faces are more critical to cut them I need a 2mm slot drill you then have a rotary slide valve that precesses around driven by the crank shaft, it'll be clearer when i show it all put together. Any way on with the cylinder heads:- cut some 1/4" ally plate leaving 1mm big all round, and made some toolmaker buttons, the plates were threaded M6 and the buttons attached. Then gripping onto the button a register was turned up a nice fit in the cylinders and the heads skimed off to 4mm thick. Then on parallels the button was clocked up to bring its centre line onto the quils centre line. Then it was just a mater of using the DRO to find the position to drill the bolt holes, as I've shown before. I want to fit a little brass boss on the head as a bit of bling, so first off ground up a radius form tool, I just took advantage of the rad that had worn on the edge of my off hand grinding wheel. Then using this form tool a nice rad was produced on a bit of brass this was then threaded M6 and parted off. And screwed into the heads, this is how they look, a bit of tidying is still required but things are looking OK. Cheers Stew |
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