Starting my engine

[ART]

Mosey,
    There are many valid processes for getting valves to seat properly, and I have had my share with the frustrations related to them. Several years ago I was talking with a gentleman at an engine show who had 4 engine models running well which, judging from their condition and design, were many years old. In my conversation with him I inquired how he recommended I could get my valves seating better. His reply was that the valve seat needed to be as thin as possible to allow for the best seating. He used 10 penny common nails for his valves, turned some angle close to 45 degrees on the valves, and made the inside of the valve cages/head absolutely FLAT. He did not attempt to turn a mating seat. He would either just use valve grinding paste or just tap the valves into the cages with a small hammer to form the seats, and then lap them a little with fine compound by hand back and forth a couple of times. I asked him if the engines he was displaying were accomplished this way, and he said they were. I came home, and removed the head from an Upshur engine I was having trouble with, and removed the valves. I turned the inside of the head FLAT, no seats, and replaced the valves lapping them with fine lapping compound. After reassembling the engine I had much better compression, and the engine started . The seats were about .005 wide, and I believe that with further running have seated better. Just something to think about. Good luck getting the bugs worked out.
                                                                                                                                  ART

[ogaryd]

Something that isn't mentioned to often when discussing I/C valve sealing is guide to stem clearance and valve seat width. Automotive intake valve seats are around 60thou wide & exhaust 90, scaled down are less than .015. My valve stem clearance I try to keep under .001, no shake with smooth movement. The last engine I completed add a valve dia. of .157 and the seats were burnished, not cut leaving the seat approximately .005 wide. the seat was brass & valve titanium. narrow seats have higher valve seat pressure and will seal tighter. I used Semichrome polish,(very fine metal polish) to lightly lap the valves. I hope this might someone, Gary

[ogaryd]

Looks like Art and I were typing at the same time, Gary

[Mosey]

Be patient with me guys, as I am working into this solution. Yes, narrow seats, lap valve to seats with very fine compound, cut seats fresh with tool I'm making to take out the rings I put in there.
Thanks for all of the input, it's a help.
Mosey

[Mosey]

Making a vale-seat cutter, per G. Britnell suggestion and guidance.
Turned a shaft with a pilot to fit the valve guides.
Cut 45 degree face
Milled 6 cutting edges into face.
Honing of cutting edges next.






Heat treating of cutting edges will follow shortly in this W-1 drill rod material.
Mosey

[Brian Rupnow]

Mosey--I think that all of us guys who build i.c. engines have one of George's "special valve seat tools" stashed away in one of our cabinets!!!-----Brian

[Mosey]

I think they ward off vampires, ha.
Mosey

[ths]

That's such a cute milling machine there Mosey, what is it? Hugh.

[Jo]

Its not a Sexy  its his sister 

Jo

[Mosey]

Hugh,
It is an Aciera F1,and we are in love.
Every time I am fortunate enough to have a use for her, I smile. Next operation is to tilt the universal table 45 degrees, rotate the Rotary table 15 degress, and finish milling the cutting edge. Wish I had her big sister the F3.
She has a vertical head as well.
But, the envelope of work is tiny...I think it is about  100 x 75 x 150 mm.
Mosey

[Jo]

Brother and sister: The slightly smaller/lighter Aciera F1 and the Sixis 101

Jo

[Brian Rupnow]

In regards to warding off vampires----
They ward of something much worse than vampires. Vampires just suck your blood. Valves that won't seal can suck out your entire soul. Ask me how I know------

[Mosey]

Brian,
I am determined to lick this sealing problem, going slowly through the pieces and making them the best I can. I am heartened to know that better men than I have been down this road and survived, ha ha.
I have looked at all of the valve and seat parts under 10x loupe and no wonder, they look like they were plowed for potato planting. Soon though, they will will be smooth, narrow seats, and they will seal.
Going on walkabout and will pick up in June.
Thanks for the support.
Mosey

[Jo]

But, the envelope of work is tiny...I think it is about  100 x 75 x 150 mm.
Mosey

So Sexy is a fair bit bigger with a work area of: 150 x 100 x 150

Jo

[crankshafter]

Hugh,
It is an Aciera F1,and we are in love.
Every time I am fortunate enough to have a use for her, I smile. Next operation is to tilt the universal table 45 degrees, rotate the Rotary table 15 degress, and finish milling the cutting edge. Wish I had her big sister the F3.
She has a vertical head as well.
But, the envelope of work is tiny...I think it is about  100 x 75 x 150 mm.
Mosey

Mosey I think you are aware that I have the F1 big sister whit some wistles and bells Wish is that it had been even little bigger to suit my 8" rotab
CS