Hi Peter, List<div><br></div><div>Just for explanation, the Lister conversion project took place over three consecutive Workshops at All Power Labs, Berkeley, California. Between Feb 2010 and April 2012, the team slowly picked away at the project.<br>
<div><br></div><div>The original spark ignition circuit was based on an Arduino, with a Hall effect sensor being triggered by a tiny neodynium magnet taped to the flywheel rim. A darlington transistor drove the low tension side of a car ignition coil.</div>
<div><br></div><div><a href="https://files.pbworks.com/download/Mk7b7ymPda/gekgasifier/30638003/Lister_spark.pdf">https://files.pbworks.com/download/Mk7b7ymPda/gekgasifier/30638003/Lister_spark.pdf</a></div><div><br></div>
<div>I used a variable resistor on one of the analogue input pins as a "timing control". The idea was to fit the magnet very well in advance of the optimum position, and then adjust the timingcontrol to add a given delay, to allow the firing point to be adjusted to the position that gave the best running.</div>
<div><br></div><div>This is what we used in the February 2010 workshop, when the engine first ran on woodgas. However a later discovered bug in my code meant that the timing control was not really working as intended.</div>
<div><br></div><div>For the Fall workshop of 2010, I remade the ignition circuit on stripboard and shipped it out to California, and Ron Ohler, Mike La Rosa, Marcus Hardwick worked on the project. I could not attend that workshop.</div>
<div><br></div><div>The team fitted the newly positioned spark plug in the side port and proved that the engine would run.</div><div><br></div><div>Marcus and I revisited the Lister project in March 2012 in the run up to the April workshop. The Lister was converted back to stock 17:1 compression ratio and given a new head gasket and more permanent arrangement with gasifier, cooling and exhaust systems. </div>
<div><br></div><div>The electronic ignition (my department) was our Achilles heel this year, and after a couple of microcontroller and transistor burn-outs, we eventually replaced it with a commercial MSD spark ignition unit and coil. Ron Ohler and Andy Schofield went on to get the engine running sweetly, after a lot of fiddling looking for the best ignition point.</div>
<div><br></div><div>I have now returned to the UK, and I am keen to maintain interest going in the spark conversion of diesel engines. The developing countries are littered with small hp diesels such as Lister, Petter, Changfa clones performing pumping, generation and agricultural processing tasks. To come up with a cost effective spark conversion for these generic engines so that they can be economically run on producer gas from biomass, would be a major step towards petroleum independence.</div>
<div><br></div><div>The original IISc paper describing the performance testing of a 3 cylinder spark converted Indian diesel engine at 17:1 CR is here:</div><div><br></div><div><a href="http://cgpl.iisc.ernet.in/site/Portals/0/Publications/ReferedJournal/Biomass%20derived%20producer%20gas%20as%20a%20reciprocating.pdf">http://cgpl.iisc.ernet.in/site/Portals/0/Publications/ReferedJournal/Biomass%20derived%20producer%20gas%20as%20a%20reciprocating.pdf</a><br>
<br><div class="gmail_quote"><br></div></div></div><div class="gmail_quote"><br></div><div class="gmail_quote">regards</div><div class="gmail_quote"><br></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br>
</div><div class="gmail_quote">Ken Boak</div>