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Discussion in 'A Work In Progress' started by Foketry, Sep 24, 2019.
The final check on motor block
Very impressive work!
I'd love to know more about how you use the block with the five holes in picture 8898. I assume it lets you do the offsets for the various cranks, but I'm not clear on how you would line things up - unless there are matching centers in the opposite end of the crank shaft?
Very nice! That grinder looks like it would come in handy.
yes, as you think , on the opposite side there are the same matching centers for cranks
The screw you see in the photo is to drag the crankshaft through the lathe chuck
Is that wood packing between the crankwebs ?
yes, it is hardwood glued with epoxy
The valves, made from a stainless steel bar
the steel chips produced by one valve
all the valves +3
It's hard to express just how impressive that picture is.
It might seem simple enough. I can imagine some <clueless> person saying, "it's just 17 little rod thingies, right?" Oh, yeah - "just" 17 *identical* pieces, representing hours upon hours upon hours of exacting work, that's all!
I'm feeling daunted at the prospect of making 2 valves for my first IC engine attempt. I see this picture and I'm in awe!
Why do you make 19 valves?
But as usual at your pictures, very very nice. What do you thing you are finished and running the V8.
Is it a x-mas gift for somebody?
I worked one day to make the first 2 valves, scraps, I found the right tool with a very small tip radius, many small turning steps of 0,2 -0,3 mm to avoid bending the valve , in total about 4 days to get 19 valves
better to have some spare parts, when I assemble the valves in the seats and do the vacuum test, if there are any leaks, I replace them
If all goes well, I hope to hear the first bursts at the end of January / February
The rocker stud
The pistons, hole drilling
piston , internal milling
the piston assembled with small screw to fix the wrist pin
Hey Foketry it looks like you make the piston cylindric!
Didn´t you make them a little conical 0.04mm smaler on top regarding the expansion by heating up during running?
My pistons have no taper or diameter reduction on top.
These model engines have no hardened parts, camshafts, crankshafts, valve seats etc, so they can't run continuously for hours and hours, just a few minutes each time.
This means that they do not reach high temperatures, in my opinion the conical or smaller piston on top is not necessary.
Also the piston drawing , designed by Steve Huck does not require smaller on top.
In any case reduced on top it can be done, it is a technical perfection absolutely necessary for larger engines
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