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You have not understood the whole point of 0.03 mm. It is not the lifting height of the camshaft itself. When Find Hansen measured the 0.03 mm pump stroke it was at idle he could observe how big the pump stroke was to be able to run the engine at idle. Look at it all: For example, the camshaft...

Minh-Thanh,... It is allowed to dream, but be realistic and listen to us who can provide the answers to what you need to know based on our knowledge and experience. Here in the forum, it is nice to be guided to solve the problem and make the engine work with good results of patience and...

Read again this: Both motors have a 2 mm diameter pump and the stroke length is determined by the regulator to a desired speed range.

To generate the pressure is determined by the spring in the injector and not from the pump. Strong spring generate better atomized fuel and vice versa. Also adjust the spring to generate the oil pressure and get fuel atomized. The oil is not compressible and the nozzle will open at high pressure.

Minh-Tanh.. You wrote in post #76: "I just finished designing the engine Bore : 19 mm , stroke : 38 mm" Also near same dimension as a Find Hansen engine who has 20 mm bore and 36 or 44 mm stroke. Also you need small diameter pump and small injector nozzle + regulator. The amount determined...

From Find Hansen homepage

How big are the bore and stroke in your engine? Find Hansen engine has bore 20 mm and stroke 36 mm. Small cylinder volume = small amount of fuel to be injected and vice versa. The small engine need small injector to atomize the fuel better with small amount of fuel than the large injector. Too...

Find Hansen diesel engine has a pump stroke at 0,03 mm under idling. It means that you can have a smaller injection nozzle.

Much better atomized fuel. The important is the amount of the injected fuel into the engine.

Compound steam engine is using less steam than 2 cylinder steam engine and the exhaust of steam is expanding in the next cylinder with large piston diameter for about same effect. To start up the compound steam engine, you need the start valve/simpling valve to send the steam pressure to the low...

The film that was shown is very similar to steam engines that were used in wheeled steamships like this picture. :) Nice work at these steam engines.

Hi Greg, you found the Comet engine fast as you can :D. Yes, it's a semi diesel engine in the chain saw engine. You do not need to have this complicated in this engine when you can run the engine with simple parts instead of using injection and pump. Then the engine sucks the fuel via carburetor...

What is so special with the chainsaw that you see here in the picture?:) It is a Norwegian product from 1950 to 1954. The engine is a 49 cc and produces 4 hp at 4000 rpm.

Connect the lever for amount of fuel to the centrifugal regulator and the ekstra lever with spring connected to the lever for amount of fuel. Then the engine are running with right regulated amount of fuel in the right rpm range.

Diameter in the hole for wrist pin looks a little too thin considering the forces from the combustion pressure can be strong enough to break off the wrist pin.

Minh-Thanh,.. easy to remember the rule: Rule 1 A certain speed has a certain amount of diesel that is injected into the cylinder which is impossible for a designer to make a diesel engine without a regulator whether it is mechanical or electronic as the amount varies constantly under a...

Minh-Thanh.. I have experienced the vacuum regulator did not work (regulation takes place by vacuum which affects the piston when there is a high vacuum = less fuel and vice versa) in the Sabb semi-diesel engine. The engine ran so fast like a crazy horse that I had to stop the engine...

Minh-Thanh.. Take a study how the centrifugal regulator works as here, begin at the timeline 12:30 in this movie..

In fact not possible without centrifucal regulator. Use centrifugal regulator, it's practical to control correct amount of fuel affected by engine via force of spring to regulate amount of fuel automatic by engine. To regulate required revolution: regulate the force of spring on the...

Minh-Thanh.. :) If you let the engine regulate the amount of diesel and you adjust the idle with the spring, for example the idle screw on the throttle lever and another screw to the maximum speed on the throttle lever, then it is much easier than regulating on the pump itself without regulator.