V-twin engine from scratch - yet another interpretation of how (not) to build a

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sorveltaja:
Valve guides in place:

I warmed the heads some, and pressed guides in. At the moment, they have different length, and will be filed shorter, after valves are done.
Also the guide holes need to be reamed to 2mm(0.078").

sorveltaja:
I enlarged the valve holes just bit too much, and had to fill them with brass buttons and silver solder:

I guess, that I have to be more patience, when machining the valve holes :wack:.

madjackghengis:
Sorveltaja, just to let you know, harley's from 1948 through 1965 used cast in place bronze valve seats, with good success, and they were commonly "built up" with a torch, when they had been machined too many times and needed renewal, so valves will readily seat in your "brass buttons", or in the head its self, if you get that far down. Looking good, can't wait to see the finished engine. Mad Jack :bugeye:

sorveltaja:
Some progress with the valves:

They are made of two piece of stainless each. Shafts are from 2mm(0.078") bicycle wheel spoke, and lower parts are of some not so easily machinable stainless.

I prefer to make the one piece valves, but haven't got suitable material for that.

I also planned to drill 1mm(0.039")holes for valve shafts, to hold the valve cap, and spring. But the shaft material is very tough stuff to drill, as it's most definitely one of those famous notoriously easily work-hardening grade stainless.

So, I had to make the grooves instead of holes. I used cheapo diamond cutting wheel disc for that.

Anyways, valves need to be made equal length, and the anglular working surfaces are also to be machined.

sorveltaja:

--- Quote from: madjackghengis on March 24, 2010, 11:16:55 AM ---Sorveltaja, just to let you know, harley's from 1948 through 1965 used cast in place bronze valve seats, with good success, and they were commonly "built up" with a torch, when they had been machined too many times and needed renewal, so valves will readily seat in your "brass buttons", or in the head its self, if you get that far down. Looking good, can't wait to see the finished engine. Mad Jack :bugeye:

--- End quote ---

Mad jack, that's quite nice detail to know about older engines :thumbup:, since I have always been fascinated of nowadays maybe simple techniques, that were used to make those engines.

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