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Kai Klaas
12/18/05 07:26
Modified:
  12/18/05 07:28

Read: 763 times
Germany


 
#105494 - Very well dangerous...
Responding to: Farshid Jafari Harandi's previous message
Farshid said:
I got shocked by this Hi-Voltage times to times.If I'll be correct it should be about 5-10KV.

Older ignition systems with mechanical interrupter did provide an ignition voltage of about 20kV. This could make an about 2cm long spark in free air (1000V per mm). This voltage wasn't harmful, but painful.

The newer transistorized ignition systems, where a special zener protected transistor is used as interrupter, provide an ignition voltage of about 35kV. Not only this high voltage is dangerous, but also the much higher currents, that can flow.
These ignition systems can be dangerous and harmful!! Take care!!!

The reason why a so high ignition voltage is needed, although the gap of sparking plug isn't wider than 1mm (plus 1mm gap in the distributor), is to guarantee the proper function even if the gap of sparking plug is wet from fuel. Also, when the battery is discharged and the engine is cranked, battery voltage and by this ignition voltage can dramatically break down.

By the way, there's a very simple and nice methode to check, whether the isolation of ignition cables is proper: Start the motor and have a look at the ignition cables, but do it in total darkness. If the isolation is damaged, then you will see a blue glimming, right there where "parts" of the ignition voltage leave the cable and run to grounded motor parts. The blue glimming comes from ionized air.
Older ignition cables can shine bright and look like a Christmas tree...

Stay well, dear Farshid,
Kai

List of 73 messages in thread
TopicAuthorDate
What do you guess it could be ?      Farshid Jafari Harandi      12/16/05 14:14      
   Van Der Graaff generator?      Andy Neil      12/16/05 14:27      
      Whimshurst      Farshid Jafari Harandi      12/16/05 19:08      
   Gas light      Steve M. Taylor      12/16/05 15:58      
   Sparking plug?      Kai Klaas      12/16/05 18:11      
      That's it !      Farshid Jafari Harandi      12/17/05 08:33      
         Very well dangerous...      Kai Klaas      12/18/05 07:26      
            Condenser      Farshid Jafari Harandi      12/18/05 08:45      
               Electrolytic, really?        Kai Klaas      12/19/05 10:43      
                  RE : Electrolytic, really?      Farshid Jafari Harandi      12/19/05 15:36      
                  Could my modifications be harmful ?      Farshid Jafari Harandi      12/21/05 05:41      
                     Capacitors      Steve M. Taylor      12/21/05 05:49      
                        it's always in my sight ;)      Farshid Jafari Harandi      12/21/05 09:21      
                     DCCS      Farshid Jafari Harandi      12/21/05 09:25      
                        So      Steve M. Taylor      12/21/05 10:34      
                           Specifications      Farshid Jafari Harandi      12/21/05 14:10      
                              dash      Steve M. Taylor      12/21/05 14:55      
                                 Box and remote starting      Farshid Jafari Harandi      12/21/05 22:10      
                                 Vacuum forming      Farshid Jafari Harandi      12/22/05 14:44      
                              Plastic Boxes      Jon Ledbetter      12/21/05 15:52      
                                 potting boxes      Farshid Jafari Harandi      12/21/05 22:16      
                                 Potting Boxes?      Farshid Jafari Harandi      12/22/05 14:43      
                                    Vacuum Forming      Jon Ledbetter      12/22/05 15:18      
                                       Thanks for the link      Farshid Jafari Harandi      12/22/05 15:31      
                                          Still need a nice "front"      Steve M. Taylor      12/22/05 16:52      
                                             Casing...      Farshid Jafari Harandi      12/23/05 04:56      
                                                display      Steve M. Taylor      12/23/05 09:38      
                                                   Hidden until light up      Farshid Jafari Harandi      12/23/05 11:10      
                                                      Visiting Tehran      Steve M. Taylor      12/23/05 11:17      
                                                         mail ?      Farshid Jafari Harandi      12/23/05 11:29      
                                    Laptop      Steve M. Taylor      12/23/05 03:11      
                                       Hmm...      Farshid Jafari Harandi      12/23/05 05:17      
                        Dash      Jon Ledbetter      12/21/05 10:53      
                           ...nor      Steve M. Taylor      12/21/05 11:08      
                           Covering is hard      Farshid Jafari Harandi      12/21/05 14:02      
                     Battery seems to be disconnected!      Kai Klaas      12/21/05 09:45      
                        blocking      Steve M. Taylor      12/21/05 10:37      
                        Electrical sytem      Farshid Jafari Harandi      12/21/05 14:01      
                           As I suspected...      Kai Klaas      12/22/05 07:46      
                              How to connect the second battery      Farshid Jafari Harandi      12/22/05 09:50      
                                 Err      Steve M. Taylor      12/22/05 10:22      
                                    Dual battery      Farshid Jafari Harandi      12/22/05 13:06      
                                       OOOPS      Steve M. Taylor      12/22/05 13:17      
                                 You could try this      Kai Klaas      12/22/05 18:31      
                                    RE :You could try this      Farshid Jafari Harandi      12/23/05 05:19      
                        Electrical sytem      Farshid Jafari Harandi      12/21/05 14:03      
            Neat trick      Steve M. Taylor      12/19/05 12:30      
               arcing cables      Terry Lingle      12/19/05 12:57      
                  no way      Steve M. Taylor      12/19/05 14:18      
                  Wow !      Farshid Jafari Harandi      12/19/05 15:38      
                     50,000 volts        Terry Lingle      12/19/05 22:49      
                     Switching techniques      Andy Neil      12/22/05 20:45      
                        Per Plug ?      Steve M. Taylor      12/23/05 03:10      
                           Sort of      Andy Neil      12/23/05 18:38      
                        New techniques      Farshid Jafari Harandi      12/23/05 04:55      
                           Current techniques      Andy Neil      12/23/05 18:44      
                              DC/DC Converter not dedicated coils      Farshid Jafari Harandi      12/23/05 20:54      
                           Ferrari 348      Kai Klaas      12/23/05 19:13      
                              Distributor-less      Farshid Jafari Harandi      12/23/05 20:54      
                                 Not quite      Kai Klaas      12/24/05 06:00      
                                    Look here      Kai Klaas      12/24/05 06:16      
                                       Coils      Farshid Jafari Harandi      12/25/05 01:28      
                                 Distributor-less      Andy Neil      12/24/05 06:16      
                                    Wear and tear      Kai Klaas      12/24/05 06:41      
                                       Amazing      Steve M. Taylor      12/24/05 11:58      
                                    Distributor      Farshid Jafari Harandi      12/25/05 01:28      
                                       Electrical field strengths would be huge      Kai Klaas      12/25/05 06:05      
                                          Big 'uns.      Steve M. Taylor      12/25/05 14:22      
                                             Interesting      Farshid Jafari Harandi      12/25/05 20:57      
                                                Hate to think      Steve M. Taylor      12/26/05 06:10      
                  Porosity of cables      Kai Klaas      12/21/05 09:19      
                     corona      Steve M. Taylor      12/21/05 13:54      
                        Ah, that's the right word.      Kai Klaas      12/22/05 07:14      

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