Engines > From Kits/Castings
Galloway 1/3 scale engine build
rklopp:
The OD of 1/16 pipe is 5/16". The nominal size is 1/16, but that has nothing to do with reality. Likewise, 1/8" pipe is 0.405".
Jasonb:
Drill it letter C or 0.242". If you compare that to the 1/4" threads on the other side it's right.
gbritnell:
When Ministeam bought the rights to the Galloway series of engines, the patterns and drawings they hired me to build one of each scale. The original drawings that had been drawn by Richard Shelly were in need of updating so I redrew all of them except the 1/8 scale. Those were done by Bob Nawa. If you have any questions along the way I'd be happy to answer them. The most sensitive part of the carb is getting the fuel valve sealed. Not the needle valve. The fuel valve sits on its seat. The passage from the needle valve is drilled into the seat. When the engine is on the intake stroke the vacuum draws the valve off of the seat and allows the air to flow and draw fuel from the needle valve. The reason for this valve is because the fuel tank is mounted higher than the carb so it prevents the fuel from leaking into the carb when there is no vacuum signal. The stop insert above the valve limits the valve travel. It doesn't need much travel to operate properly. The spring on the bottom of the valve only needs to be strong enough to reseat the valve. Sometimes it takes a little playing with this spring to get it just right. When Bob Nawa built the 1/8 scale engine he made the Lunkenhiemer carb for it. Very small!
AZDesert:
A question for those who have been thru a build like this. I am starting on the piston and cylinder for the this engine. Included with the kit from MiniSteam is a piece of round stock CRS for the cylinder. I have not worked with this before and as I am trying to turn it on the lathe using a carbide insert I am not getting a smooth surface. Any advice from the group on how to turn this piece accurately? It is about 2.4" in diameter and I was using an RPM of about 560. Thanks for any help.
Jasonb:
Mine came with a piece of continuously cast iron.
You don't say what inserts you are using bit it is worth trying those intended for Non Ferrous metals, not that familiar with the US code system but the ISO designation has GT instead of MT so a typical insert would be CCGT 060202 as opposed to CCMT 060202
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