Diesel engine : Kromhout Gardner 4LW 1940

[Lloyd-ss]

Heater cartridges from 3d printers can heat up the aluminium of the engine, if you are able to accomodate a heater block or blind hole.
You get around 40 W out of one. Diameter 6mm and length 20 mm.
No idea if that is useful information, or if i miss the point. At least it is not very expensive (provided you have a power supply already).
Greetings.

View attachment 149247

Seeing this reference to 3d printer heaters, I was poking around some sites and noticed numerous sources for hardened steel printer nozzles down to 0.2mm. Very inexpensive. Seems like they might be suitable for injector tips.

 

[minh-thanh]

but the more I read, the more confused I got. Quite a complex subject. Also, the seasonal differences in highway diesel blends is always there.

This makes me think that, because home built diesels seem to be (generally) a bit difficult to start, that having a fuel with consistent properties from session to session, might be causing more problems than one would expect.
Just a thought.

Yes, it's a bit complicated but don't worry too much about it.
With this engine I take it as a test, ..because I want to know a little more about the small diesel engine as well as I can see if it can run on diesel, how does it run? how do I tune it?... , push it to the limits of my engine and my machining...
I found the problem with this diesel engine : The temperature of the compressed air in the cylinder as well as the design to avoid heat loss (the problem is that I am not the engine designer )
I will redesign and make a new version based on my experience with this version
Again, don't worry too much about it !!

 

[Lloyd-ss]

..............................................................The temperature of the compressed air in the cylinder as well as the design to avoid heat loss (the problem is that I am not the engine designer )
I will redesign and make a new version based on my experience with this version
....................................................

(Quote edited by Lloyd for emphasis)

Read my signature line below to get a laugh. Seems like many of us are driven by that same affliction, LOL.
Lloyd

 

[minh-thanh]

I'm still tuning and playing with this engine
Learn how to properly adjust the spray time, as well as learn the heat....I will apply it to my future designs
My engine is very small, 8.5-> 9 cc per cylinder and it still runs on diesel so you shouldn't worry too much about fuel with your engine.
Focus on the mechanical part and solve each problem

 

[Steamchick]

I drill brass jets down to 0.2mm drill. For use as gas jets for gas burners. The jets for 3D-Printers (Lloyd #221) could be used, but "commercial" gas jets cost about £3 each, whereas I buy drills for £2.50 for a pack of 10... and the brass stock is pretty cheap too.
K2

 

[Roger B]

0.2mm in brass is ok, in stainless steel it is more difficult.

Getting adequate compression pressure and temperature in small engines is difficult. The cam timing, specifically the closing of the inlet valve, can significantly effect the compression at low/cranking speeds. Gardener used a modified rocker arm that could be slid along to increase the valve clearance so the inlet valve closed at BDC giving maximum compression rather than the 20-30° later that would give the best performance.

 

[timo_gross]

0.2mm in brass is ok, in stainless steel it is more difficult.

To snap off drills up to 0.8 mm I do not even need any material. I can do it just beeing clumsy during handling. ....

I am sorry for the stupid comment. could not help it.

 

[Lloyd-ss]

To snap off drills up to 0.8 mm I do not even need any material. I can do it just beeing clumsy during handling. ....

I am sorry for the stupid comment. could not help it.

Timo, maybe you have a special gift. I have heard of people bending spoons with their mind. It seems you can break those drills just by thinking of drilling a hole with them. Amazing!

 

[ruben]

My compression gauge fits in place of the injector. It has a non-return valve as close to where the injector nozzle would be as possible so as not to affect the combustion chamber volume. The valve currently doesn’t seal as well as I would like.

In the video clip the pressure is reaching more than 40 bar but there was no clearance between the valves and the piston. I have since added a 0.5mm copper shim gasket which has reduced the pressure to 30-35 bar which is still sufficient for a cold start.

View attachment 149155

View attachment 149156





I have used two different types of fuel feed pump. One is a diaphragm pump based on full size practice where the pressure is maintained by a spring.


View attachment 149157


The other is an electric pump like you are thinking of using with a pressure relief valve mounted on the injection pump to allow the fuel to circulate. The pump is rated for 12V and delivers more than enough fuel with a 5V supply.

View attachment 149158

Hello, where can I find the plans for that injector?

 

[ruben]

Hi All !
A little update View attachment 139309View attachment 139310View attachment 139311View attachment 139312

Where are the plans for these engine

 

[minh-thanh]

I designed it myself
There is one mistake with the fuel pump system: there is no part to shut off the fuel, which makes adjustment....extremely difficult.
I'm changing and redesigning the entire engine.

 

[ruben]

Lo diseñé yo mismo
Hay un error con el sistema de la bomba de combustible: no hay ninguna pieza para cerrar el combustible, lo que hace que el ajuste sea... extremadamente difícil.
Estoy cambiando y rediseñando todo el motor.

You have plans for these engine

 

[minh-thanh]

I designed it myself
Yes ...I have plan

 

[ruben]

I designed it myself
There is one mistake with the fuel pump system: there is no part to shut off the fuel, which makes adjustment....extremely difficult.
I'm changing and redesigning the entire engine.

And put a solenoide valve for cut off fuel

 

[ruben]

I designed it myself
Yes ...I have plan

The plans are for pay

 

[minh-thanh]

And put a solenoide valve for cut off fuel

I think the pumping system needs a part that disables the plunger function, any external intervention will cause air bubbles to appear in the system.

 

[minh-thanh]

The plans are for pay

Hoping to have an engine plan .
Selling an engine plan is not how I make money, selling the plan is just for me to try to perfect the plan - it's like a promise to someone in need, because I'm very lazy to draw.

 

[ruben]

Hoping to have an engine plan .
Selling an engine plan is not how I make money, selling the plan is just for me to try to perfect the plan - it's like a promise to someone in need, because I'm very lazy to draw.

And can you send me the plans

 

[ruben]

Creo que el sistema de bombeo necesita una pieza que desactive la función del émbolo, cualquier intervención externa provocará que aparezcan burbujas de aire en el sistema.

Here is a run with the needle injector:



The original Eisfeld model aircraft diesel engine used an open injector having also tried needle types. He then moved on to the current carbureted design. I have attached a translation of the original article.View attachment 149060

how are the name for these engine

 

[The Ignoble Troll]

Hoping to have an engine plan .
Selling an engine plan is not how I make money, selling the plan is just for me to try to perfect the plan - it's like a promise to someone in need, because I'm very lazy to draw.

But you're good at it! Your injector drawing was great.