Serie Benziner Zündtabellen

    • Serie Benziner Zündtabellen

      Mit freundlicher Erlaubnis des Admins Serie II Club Forum, UK:


      Following on from the thread a few weeks ago i promised i would compile a set of dynamic timing data for the 2 1/4 petrol engine using my Crypton engine diagnostic centre.
      To start with i found our what reference data there was in the Haynes and Crypton manuals:
      Haynes:
      CB gap: 0.014 - 0.016". No mention of Dwell angle nor distributor type.
      Centrifugal advance:
      38 - 42 deg @ 4500 rpm
      30 - 34 deg @ 3500
      22 - 26 deg @ 2500
      12 - 16 deg @ 1200
      4 - 12 deg @ 900
      0 - 4 deg @ 600 rpm
      No advance below 450 rpm


      Static timing:
      8.0:1 compression TDC using 90 octane fuel, 3 deg ADTC using 85 octane.
      7.0:1 compression 6 deg BTDC using 90 octane, 3 deg BTDC using 83 octane.


      Crypton tune up data manual 1984 version.
      Ducelier distributor, CB gap 0.14 - 0.022 Thou. Inch. Dwell angle 57 deg.
      Static Timing: 8.0"1 compression TDC for 90 octane, 3 deg ATDC for 85 octane
      Centrifugal advance:
      38 - 42 deg @ 4500 rpm
      22 - 26 deg @ 2500
      12 - 16 deg @ 1200
      centrifugal starts at 400 rpm


      Lucas 4163 distributor, CB gap 0.014 - 0.016 Thou inch, Dwell 52 - 62 deg.
      Static timing: 8.0:1 compression TDC for 90 octane, 3 deg ATDC for 85 octane
      Centrifugal advance:
      42 deg @ 5400 rpm !
      30 - 34 deg @ 3500
      4 - 12 deg @ 900


      Real life measurements using my 1970 SIIa fitted with the Lucas 25 D and standard points and then the 45 D clone with points and finally the same 45 D clone with Powerspark ignition module. I do not know if mine is a 7.0:1 or 8.0:1 engine.

      Lucas 25 D marked 4163.
      CB gap 0.015 Thou. Dwell 59 deg @ 1000rpm
      Static timing was set at 3 deg BTDC and i was using regular unleaded petrol.
      Centrifugal advance:
      22 deg @ 1200 rpm with vac, 20 deg no vac.
      14 deg @ 900 rpm with vac, 12 deg no vac.
      6 deg @ 600 rpm with vac, 3 deg no vac.

      45D clone with Powerspark
      This was how i was running the vehicle before i started playing around,
      but i had no record of what i had set the initial static timing at
      before fitting the powerspark module. When trying to find out the
      static timing i used an oscilloscope and was rather confused to see the
      powerspark signal was way, and i mean way after TDC, yet the vehicle ran
      fine with no pinking and plenty of power.
      The dwell angle with this
      set up is fixed by the powerspark module and mine is just 18 deg. well
      under that offered by a points set up.
      Centrifugal advance:
      24 deg @ 1200 rpm with vac, 14 deg no vac.
      12 deg @ 900 rpm with vac, 12 deg no vac.
      4 deg @ 600 rpm with vac, 4 deg no vac.
      When i converted this set up back to points with a gap of 0.015 thou the static timing was shown to be TDC for this distributor.

      45D with points
      CB gap 0.015 thou. Dwell angle shown as 43 deg @ 1000 rpm.
      Static timing TDC.
      Centrifugal advance:
      22 deg @ 1200 rpm with vac, 10 deg no vac.
      8 deg @ 900 rpm with vac, 8 deg no vac.
      2 deg @ 600 rpm with vac, 2 deg no vac.

      45D with points
      CB gap 0.015 thou. Dwell angle 43 deg @ 1000 rpm
      Static timing 3 deg BTDC
      Centrifugal advance:
      26 deg @ 1200 rpm with vac, 16 deg no vac.
      11 deg @ 900 rpm, with vac, 11 deg no vac.
      5 deg @ 600 rpm with vac, 5 deg no vac.

      45D with Powerspark module and initial static timing set to 3 BTDC using points.
      Dwell = 18 Deg.
      Centrifugal advance"
      22 deg @ 1200 rpm with vac, 18 deg no vac
      14 deg @ 900 rpm with vac, 14 deg no vac
      10 deg @ 600 rpm with vac, 10 deg no vac.
      When
      re-checking the static timing using an oscilloscope the signal from the
      powerspark module to the coil was once again way after TDC.
      In terms of driving experience, starting, power delivery and smoothness of idle this is the best combination.

      Conclusion
      Forget trying to do anything with dynamic timing if you are just setting up a basic engine. Stick with Alan's stock answer whenever a question regarding engine timing is asked and set the static timing to 3 deg BTDC. I simply fitted points, set the gap to 0.015 thou, did not connect the CB wire back to the coil but connected it to a cheap multi meter with a continuity buzzer and the other end was put to battery earth. Then adjusted the distributor to turn the buzzer off when # 1cyl was on compression stroke and the pulley was showing 3 deg BTDC. Then i swopped out the points for the Powerspark module. You cannot expect to do static timing with the powerspark module in place.

      Hope this helps.
      Regards,
      Nigel

      Crypton Datenbuch
      1966


      1967



      Lucas Zündzeittabelle
      Lucas Zündzeittabelle für verschiedene Zündverteiler:
      mgaguru.com/mgtech/ignition/pdf/lucas_distributor_specs.pdf

      Und die daraus interessanten Einträge für Land Rover:

      Hi,

      Found this spreadsheet on Lucas distributor advance curves and additional info: mgaguru.com/mgtech/ignition/pdf/lucas_distributor_specs.pdf

      There are several listed for series 2 land rovers, depending on model and year. The distributor given above, 25D4 - 41363A has listed the following:
      2700rpm - 21 degs
      1250rpm - 17.5 degs
      450rpm - 7.5 degs
      advance begins 225 rpm
      4/18/12
      etc

      The new lucas distributor sold by Holden is 25D4 - 40944A has listed:
      2700rpm - 21 degs
      1250rpm - 12 degs
      450rpm - 4 degs
      Advance begins 225 rpm
      4/18/12
      etc

      The IIB 2.6 litre has a 25D6 - 41227A has listed:
      2500rpm - 16 degs
      1000rpm - 15 degs
      500rpm - 5.25 degs
      Advance begins 300 rpm
      4/17/6
      etc

      The V8 has lucas 35D8 - 41278A has listed:
      2800rpm - 13 degs
      1900rpm - 10 degs
      700rpm - 1.5 degs
      Advance begins 300 rpm
      5/17/8

      That's just a few lifted off the spreadsheet, if you've got the model number off the dizzy there is a good chance there is some advance curve data on there to match. There quite a few different 25D models and a few different 45D models fitted to series 2s and they seem to have different advance curves. Surprising really....
      Hope that's of interest.

      James



      Gruß
      AWo
      [: ]o=o[ :] SOS - Save old Series [:o]===[o:]
      Fahrer von Arnes Fahrer Fahrer, bevor Arne Fahrer wurde.
      Ein kluger Mann sagte einmal: "Die Freiheit der Meinungsäußerung beinhaltet auch die freie Meinungsbildung. So lange ich mir noch keine Meinung gebildet habe oder bilden musste, unterliegt der andere einer gewissen Neutralität und geniesst somit auch einen gewissen Schutz, z. B. dass ich ihn einfach in Ruhe lasse, wenn er mir nicht passt."