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NEWSCIENCENEWSCIENCENEWSCIENCE instead of your original engine temp indi- cator (if any). Your existing gauge is too slow for this application and will not warn you against overheating until after you have burnt something. Make sure that your engine runs no hotter than in the gasoline arrangement. VDO makes a CHT gauge with a plat- inum sensor that fits under your spark-plug against the cylinder head (make sure it is really clean before you reinstall your spark plug (as this is also an electrical ground). Always use an output transistor, such as a MOSFET, that is rated for the voltage and current that you need to get the job one. Okay, so you may have to play around with it some. Isn't that where all the fun is, anyhow? 4. If you get any engine knock or loud combustions (not compensated by adjust- ing the timing), it means that you need to install an additional coil in the chamber and rive the coil with an additional pulse sig- nal (about 19 Hz on the 0.1 sec time-base) (see figure 5). Here, you will be slowing lown the burn rate just enough so that the vapours burn throughout the power stroke of the piston. Be sure to include a board-mount POT to set the correct strength of this second pulse signal into the coil. This is a stainless steel coil of about 1,500 turns (thin wire) that you can arrange like a doughnut around the centre pipe (but not touching either elec- trode), directly over the circular 1-5 mm gap. You want no knocking at any power/throttle setting; smooth power only, but also no excess hydrogen left over from the combustion. Engine/Exhaust Treatment Get the valves replaced with stain- less steel ones and get the pistons/cylinders ceramic-treated asap when you have successfully converted and run your new creation. Do not delay, as these items will rust, either by sheer use or by neglect (i.e., letting them sit). You could make maximum use of your current exhaust system by using it with your new deal until it rusts through, then have your mechanic or welder friend fit a stainless steel exhaust pipe (no catalytic converter is required). But it could be easier to send your existing exhaust system out for the ceramic treatment, and then simply re-attach it to the exhaust ports. Figure 5 (Revised) CHAMBER APRIL — MAY 2002 NEXUS ¢ 51 www.nexusmagazine.com