They used to make electronic ignition kits for 1 cylinder engines - I put one an an old Yamaha. It was years ago but I suppose it is still around.
John Mullan wrote: >I'm sure not all small engines fall into this category, but I have seen some >where the magneto coil was slightly adjustable for timing purposes. Perhaps >filing the mounting holes so they are elongated to allow slight adjustment? > >John > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] Behalf Of Zeke Yewdall >Sent: Monday, November 07, 2005 4:04 PM >To: Biofuel@sustainablelists.org >Subject: Re: [Biofuel] Power Compost! > > >It should be relatively easy to modify the ignition timing on a >magneto driven lawnmower type engine. The magnets are usually on the >flyweel/blower on top of the engine (or the other end from the drive >shaft, for horizontal shaft engines). They trigger the magneto which >is fixed to the engine block. I guess it actually sparks during the >end of the exhaust stroke too since it's on the crankshaft instead of >the cam? If you could adjust the positioning of the trigger magnets >on the block, or rotate the flyweel in relation to the crankshaft by >modifying the keyway, you could adjust the spark timing. We would >always hit stumps with our little lawnmowers, which slowly shears the >flywheel key off, and eventually the ignition gets too far out of time >for the engine to run any more so you have to take it apart and put a >new key in. > >Adjusting valve timing is harder, since these usually use a 1:2 gear >reduction. You could shift it one tooth off, but this is probably >about 20 degrees -- too much I think, and you really need to be able >to adjust the intake and exhaust valve timing separately. Regrinding >the cams could also work, but that's probably way more work than is >justified for a little gas engine. Even more work than milling the >head. > >I'd be tempted to run it from biodigester gas. That should only >require replacing the carbureator with a relatively simple air/biogas >mixer, and probably derating the horsepower a bit based on the heat >content of the biogas. > >Zeke > >On 11/7/05, robert luis rabello <[EMAIL PROTECTED]> wrote: > > >>DHAJOGLO wrote: >> >> >> >>>Robert, >>> >>>I'm not sure what type of engine you have, but an option might be to >>> >>> >modify it to use ethanol and then delay the timing to get higher >compression. > > >> I'd like to run ethanol in my truck! >> >> Getting higher compression out of a Briggs and Stratton engine >> >> >would > > >>involve milling the cylinder head. For the amount of time the >>shredder will be used every year, that hardly seems to justify the >>machine shop expense. I've also seen tiny turbos in my internet >>meanderings, and while installing one of those would be really cool >>(Robert's turbo shredder!), I'm probably better off to swap the engine >>with an electric motor when it dies. >> >> >> >> >>>You could buy the horse and feed it the cornstalks and compute your >>> >>> >milage based on that! > > >> Then I wouldn't need the shredder, would I? >> >>robert luis rabello >>"The Edge of Justice" >>Adventure for Your Mind >>http://www.newadventure.ca >> >>Ranger Supercharger Project Page >>http://www.members.shaw.ca/rabello/ >> >> >>_______________________________________________ >>Biofuel mailing list >>Biofuel@sustainablelists.org >>http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org >> >>Biofuel at Journey to Forever: >>http://journeytoforever.org/biofuel.html >> >>Search the combined Biofuel and Biofuels-biz list archives (50,000 >> >> >messages): > > >>http://www.mail-archive.com/biofuel@sustainablelists.org/ >> >> >> >> > >_______________________________________________ >Biofuel mailing list >Biofuel@sustainablelists.org >http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > >Biofuel at Journey to Forever: >http://journeytoforever.org/biofuel.html > >Search the combined Biofuel and Biofuels-biz list archives (50,000 >messages): >http://www.mail-archive.com/biofuel@sustainablelists.org/ > > > > > >_______________________________________________ >Biofuel mailing list >Biofuel@sustainablelists.org >http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org > >Biofuel at Journey to Forever: >http://journeytoforever.org/biofuel.html > >Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): >http://www.mail-archive.com/biofuel@sustainablelists.org/ > > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
