20 cc Horizontal 2 Stroke Diesel

[Admiral_dk]

Great that you got it running again 

Next step as you say is to make it run on only the injector - I hope that you will succeed in this too 

[Minh Thanh]

Hi Roger !
Can you sketch by hand with your injectors?
your injectors look very neat
 Thanks !

[Roger B]

Hello Thanh,

Have you found my thread on fuel injection:

https://www.modelenginemaker.com/index.php/topic,4906.315.html

I will post an upto date injector drawing later

[Minh Thanh]

Hi Roger !
I've seen
I like the way you use the injectors for your engine, I will try it with my engine
about injectors, just sketching on paper is ok
My injector picture, i'm not sure if it's the injector 

[Roger B]

Following the results with the other injection systems I decided to lap the delivery valve on the diesel and have another try. The initial priming was much easier and the results with the 10° nozzle were encouraging.

The 15° nozzle resulted in a runaway.

After this it wouldn't inject or start again    I suspect that the injection pump plunger has overshot and jammed 

I am currently working on a slightly smaller helix type pump which should reduce the inertia of the pump components. I am also thinking about converting this engine to a four stroke for some trials. It is much easier to separate the various influences.

[Admiral_dk]

Great to see that you haven't given up on the diesel 

[Roger B]

I'm still working on this    I am not sure if my original plan to start with a 2 stroke was the best  so I am studying how easy it would be to convert to a four stroke and what sort of combustion chamber I would use. I am definitely getting 'diesel' combustion but if the atomisation is not good I think it is running on piston blow by