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See this link: Automatic boiler water level control system with phototransistor.

DJoksch.. With more thin water pipes, more steam is produced than smaller numbers of thick pipes. This means that you have a larger heating surface to heat the water to steam quickly and get greater pressure. Yarrow boiler is efficient to produce more steam pressure, but must supply with...

GreenTwin Your father had a rich life as a modeling engineer. So you have many fond memories of your father.😊

pirmin kogleck.. The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-called compression-ignition engine (CI...

You used cylinder made of brass instead cast iron. The problem with brass: the gringing particle by lapping paste will be embedded in brass where is very difficult to clean up free from lapping paste. Hence you got leakage in short time.

To lap the 2 mm hole is no problem: Use brass or aluminium rod who are a light tight in bore + fine and ultra fine lapping paste to lap the hole. Lap until you feel there is same resistand in the whole length of cylinder. Be carefully. To get exactly 2 mm: drill 1,9 mm and lap the whole length...

Lapping give much better precision to work in tight tolerances than to hone the parts. Read this link What is Difference Between Lapping and Honing? I lapped the pump piston/cylinder where I created the Wakefield mechanical lubricator for steam engine without O-ring. It works very well without...

To use O-ring the plunger piston must be mirror polished to not scratching the O-ring. Keep all parts clean before assembly. The nut who are holding the O-ring must be adjustable to keep tight if leakage is there and the return spring must be strong enough to return the plunger with tight O-ring.

Pirmin Kogleck.. The best solution: Lapped plunger piston of hard steel in the cylinder of cast iron with tight tolerance who are not allowing to leak the fuel, but keep the plunger lubricated toghether with the cylinder. Lap the cylinder first until all tool marks is disappeared and then lap...

The engine is running on 95 octane petrol. :) (gas is short word for gasoline = petrol in american word) Nice to know the engine ran very well due I am deaf man since I was born. :)

This also applies to the model engine, .. if you see a lot of smoke or a lot of oil spewing out of the exhaust, then it is an indication that there is something wrong with the model engine. Model engine with little or almost no smoke and good combustion = good economy on consumption and less...

See at the Briggs and Stratton are built without oil pump. The oil is splashing around in the crankcase by connecting rod with scop or by splashing wheel, no problems with the bearings when the lawn mower is working on the high grass. The old car engine in early era did not have the oil pump...

Diesel engine with 3 bearing bearings is not a good idea as the crankshaft bends and twists. the crankshaft must be supported with 5 bearings in a 4-cylinder diesel engine. The crankshafts must be strong, not undersized as you did with your crankshaft.

Minh-Thanh,.. 👉 Learn, Practice and Patience !! 👉 You asked questions and we answed as best we can .. there is a lot one can not know everything without learning from others .. painful, but its truth.. How to examine the surface after crack of steel by rotating bending 🙂👉 Continuous Estimation...

Steamchick As a general rule, the diameter is the same for both the main pins and the crank pins so we do not have problems with bending and twisting that lead to breakage. With a slightly smaller diameter of the crank pin, the length should not be longer until it can bend the crankshaft at...

Minh- Thanh,.. To understand bending and torque of the crank shaft, see this picture..

Use high tensile steel or steel from driveshaft from the car is strong enough against fatigue of the stress/load of the engine.

All rounds on corner of the shafts make the shaft strong against stress and load. There is 2 difference rounded corners, see the next picture. The other rounded corner is used in the larger shaft.

No problem if the length of hose from top of angled pipe on the cylinder to the top of the barrel is long enough to make the coolant circulating.