[Gasification] lister 6/1 spark conversion fires again on wood gas

[SOme Guy]

There are still  a few of the modified Indian Petter PHW clones floating around in the USA and Canada.
Specifically I mean the 102mm Bore 116 stroke ( the is the generic KOEL DM10 clone ). These are the preferred gas conversion. Companies like Arrow engine import them for oil filed use burning well head gas and I am aware of a few tests done with this and the RB33 ( another KOEL engine that basically a triple DM10 ) on producer gas India.
 
Mike Montieth was the Importer for the GG gear Petter clones and Satyajeet GM90. Both good direct injection diesels much better designed for the kind of experiments your running. There are a lot more of the GM90 6/1 and 8/1 engines out there but since the EPA has banned the import of no compliant off road engines there will likely be no new ones. Arrow won't tell you much of anything about their low speed gas engine the K series but being a Petter clone you can be sure the majority of parts interchange.
 
The IDI lister is not a good engine for this application that why you having to run so much timing advance, you will run into more trouble as you try and increase the compression ration. The comet combustion chamber is not ideal for SI engines.
 
Doug C


Date: Fri, 15 Oct 2010 01:55:10 -0700
From: jim at allpowerlabs.org
To: gasification at bioenergylists.org
Subject: [Gasification] lister 6/1 spark conversion fires again on wood gas

After some technical drama with a cut trace on the ignition control board, the Lister finally came to life on Tuesday eve.  Ron Ohler, Mike LaRosa and Jay did the honors, but Ken Boak, Marcus Hardwick, Michael Shiloh and Peef did much of the preparation that made it possible.   Pictures from the first run are in the workshop gallery here: http://www.gekgasifier.com/gallery/browseimages.php?do=browseimages&c=44&page=3

This time the spark plug it in the COV valve on the side of the head, not replacing the injector like the last round.  This time the diesel injection system was left intact so we can switch back and forth easily between the two. 

For the first run, we fired it on diesel then switched over to woodgas while running. It was surprisingly easy to switch over, much easier than with a carburetor on gasoline, as you could get a sharp switch off of the diesel via the shut down lever. No usual fuel wandering back and forth as the carb runs out of fuel.

The timing was fussed with quite a bit. We ended up with it about 45deg advanced, and it still didn't seem fully enough. One problem we found with the coil over plug arrangement is you can't get a timing light on the spark plug wire, as there isn't one. The inductive clamp won't work over the plug boot.

We had the kill-a-watts hooked up on each of two legs and topped out at 2.9kw. That was pushing the absolute max. 2.5kw was easy to maintain. This was at about 600rpm. A little below the standard 650rpm. Shaky shake started above 600rpm.

The compression is the 13.3:1 of last time. The injector is leaking a bit too. We'll likely get a bit more power once we return to 17:1 and get the injector better sealed.

All in all, i'm happy how much power it made, and how smooth it ran. It seemed to run about the same as it did with the spark plug in the injector hole. The biggest difference was in the timing adjust. so given the lack of good control on that last time, it is difficult to compare properly between the two modes. But it was clear that it works just fine in the COV valve, and this is good news, as this is a better place to put it.

The ability to start on diesel then switch over with a hard "fuel off" switch was very nice.

Thank you ken, marcus, ron, mike and the others that made it go. another very impressive effort by all of you.

jim 
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