I just finished moving and am months away from getting my shop to be functional. That being said I am picking away at the issues I will need to solve to build a small two stroke diesel.
Currently my thoughts are a 1" bore with a 4" stroke.
My initial plan is to build a single cylinder proof of concept unit and supply it with shop air at 15psi.
From there I want to build a 5 cylinder version that will use a bought roots blower as the air supply.
I want to start with the fuel system and perfect that before building the engine.
To that end, I plan on designing a small injector that will use minimal lapped parts and a separate fuel pump to generate the flow to run the injector. They will be connected with some sort of schedual 80 small bore stainless pipe.
For the fuel pump I am thinking that the easiest solution is to do away with mechanically driven pumps and to use a series of solenoids with a common plunger. One coil would extend a 1mm diameter plunger into a true plunger pump, the other coil would take the place of a return spring and withdraw the plunger.
With off the shelf solenoids, a 1mm plunger pump should easily generate 10,000psi.
The stroke length and timing would be arduino controlled. The dual coil solenoid pump would only need a single double pole relay to control it.
I have a few quadrat sensors somewhere that could be used to adjust timing, injection duration and injection volume.
The plunger pump will have a positive pressure feed pump, which will also allow for a fuel filter to be used.
Can anyone see any foreseeable problems with this set up?
Currently my thoughts are a 1" bore with a 4" stroke.
My initial plan is to build a single cylinder proof of concept unit and supply it with shop air at 15psi.
From there I want to build a 5 cylinder version that will use a bought roots blower as the air supply.
I want to start with the fuel system and perfect that before building the engine.
To that end, I plan on designing a small injector that will use minimal lapped parts and a separate fuel pump to generate the flow to run the injector. They will be connected with some sort of schedual 80 small bore stainless pipe.
For the fuel pump I am thinking that the easiest solution is to do away with mechanically driven pumps and to use a series of solenoids with a common plunger. One coil would extend a 1mm diameter plunger into a true plunger pump, the other coil would take the place of a return spring and withdraw the plunger.
With off the shelf solenoids, a 1mm plunger pump should easily generate 10,000psi.
The stroke length and timing would be arduino controlled. The dual coil solenoid pump would only need a single double pole relay to control it.
I have a few quadrat sensors somewhere that could be used to adjust timing, injection duration and injection volume.
The plunger pump will have a positive pressure feed pump, which will also allow for a fuel filter to be used.
Can anyone see any foreseeable problems with this set up?
