Simple injector

[resonanceman]

I still  think  that  direct injection   is the  way to go

I  think that  a small simple pump is  required

It would have to be  easy to  make  and be able to   inject directly into a  cylinder of  a diesel  near  top dead center .

Now .............believe  it or not ........everyone  that  has been  reading  these threads  knows how to build this pump .

You  just havn't  connected the  dots  yet ..


Lets  connect a  few dots  starting   with  the  fuel line

Connected to the fuel line would  be a check  valve .

Conected to that  check valve  would   be a non  conducting high  pressure tube .

Connected to the other end of the  the non conducting  tube would be another check valve .

Connected to  the  second  check valve  would  be  a non  conducting high pressure tuble going to the  cylinder .

A  board  with some  simple  electronics   would also be needed .

Oh ......... also .......  there would have to be  wires  from the  output of the  electronic  board to the  bodies  of the check valves .

For  the most  basic  electronic  controls  we would need a high voltage source and a low  voltage source  . and  a way to switch  the  high  voltage source on and  off at the right times .

The  most  advanced  countrols  that could be made would  include a small  computer that creates   simulations  of all the signals that a modern ICE  looks for .


It  doesn't  matter if we  create bubbles in the water as we pump it .
All that is required is we get the pumping pressure up quickly  at the right time

Can  the volume  that we pump  be controlled ?     
I am not  sure what ink jet printers  use for  check valves ........but they  work in this  exact same way .   They seem to control  the  volume  pretty well


gary

[resonanceman]

I think  that the ideal  way to  ignite the  water is to  make a  spark plug  with  a tube going through  the middle  of it ..........and  have electrodes  in that  tube  .

One nice thing about this set up ....... neither of the  electrodes would not have to be  connected to the engine

learning to make  plugs like this  would not be easy ....... but it would make  a good  " cottage industry  "  once the  details are ironed out

gary

[resonanceman]

After  thinking about  how the  arc  would work in  between the  bodies of the   check valves I  realized that  it would be  difficult  to construct  without  making   a gap that was way to wide .

I am now thinking that  a  metal  tube should be attached to  one  check valve and a  metal rod  to the other .

The   rod  would  fit inside the tube .......the  spark gap  would be  between them . 
The  high pressure non conducting tube would  slide over the metal  tube .......and it would have to be a little longer  than the metal   tube to  prevent sparking  between the  metal tube and the other   check valve body

The  whole  thing  should  be  rigid .......but  it doesn't  have to be aligned perfectly . 

gary

[resonanceman]

For  the  plug part of the injector  what looks best to me  was found on  the  first  link  of  post 335 on  Lucs Urgent  thread .

http://www.myelectricengine.com/projects/mpdthruster/mpdthruster.html

Unlike  this  thruster   I  think the  plug    part  for our  uses should  be ALWAYS on
It should be powered by a simple HV  transformer .

The  voltage  of the transformer should be low enough that   there is no arcing   unless there is  water  or  plasma in the gap

The  engine  HP  will  be regulated  by  how  much  of a bang  we  make in the injector .

I   think  we will have to  scale   the sparks back a bit .   ....... the sparks  that people are getting  now  are probably to big for the injector .   .......... 
An ignition  coil may be to  big for the HV  for the  injector .

The    water  will take  a short  amount of time  to  move through the    second  check valve .........this  will  offset any need to retard  the timing .
A  small  accumulator  could be added   to even out the pressure of  the injector  bang  and   make the  plug  fire longer ...... 

gary

[resonanceman]

I did  a couple  simple  of  the  basic  concept  of the   electrode  end of the plug

I am  new to  drawing  on the computer .

It took WAY longer than  it should  have  to  draw these .   It is not hard .........but it is like  learning a new language .   You  have to search for the way each thing  is done. 

These  drawings  are for  concept  only . 
There  is no  measurements worked out yet

The  first  image is of the   actual electrode  set up  that fires into the  cylinder

The blue  part represents   the  outer  shell .    At first I  will  be breaking  the  ceramic  out of old  sparkplugs and  reusing  it  for this part .

The  black   is  a tungsten  rod     
I did a quick search and found that  tungsten   electrodes  are avalible for  some common  welders   from  .40 in  to  3/16  in.        There may be other sizes commonly  available  .   
The  largest electorode that  there is  space for  should be used .

The  red is a  section of  copper  tube

The  white  is a castable  ceramic  .
I am  thinking of  trying     2 part Silica ceramic
Part Number:  8498K11     from  http://www.mcmaster.com/

In the drawing   notice that  the  botom  of the  ceramic  part is   rounded as it  leaves the  copper electrode  .  This is  to   try to draw the  plasma into a fan  shape.    It  is less likely  to burn a hole in the piston  that way .





The  second  drawing   is   more about   construction than  theory .
The   green  section  is a cross section of what I would call  the electrode  carrier .     It is  a combination electrode holder and  mold .        The   yellow  section  fits over the  threads of the   old spark plug thread and  between the  2 of them  I should  be able to  get  good enough alignment   during  construction

I would like to  be able to  build  the check  valves into the top of the plug ............but that may not be practical 
I will have to  experment  with  the accumulator  part of it to  see how big it needs to be  . 
There may also be  good reasons for  several  accumulators   with valves  to switch  them in or out of  operation .


This  plug is  designed to   be switched  by  the output of   the injector .    The  voltage will have to be kept   just below  what will  arc across the gap  with  no  water  or  plasma in the gap .

Notice that the  ceramic   sticks out   the bottom more  than the width of the gap . ....this is  to prevent  stray plasma  from  shorting out to the  engine  block 



gary