robsterk 10 Posted August 17, 2012 Share Posted August 17, 2012 Hello I am wondering if anyone may know what the d4 dual mag may have been used on? Link to post Share on other sites
Ivan Saxton 108 Posted August 17, 2012 Share Posted August 17, 2012 " Dual" indicates that it will function either with a trembler coil for starting, or as a conventional high voltage magneto for normal running. This is as distinct from a "Twin spark", with a double distributer block and leads to two sets of leads to two plugs per cylinder. The D series, as distinct from the contemporary DU, are a bigger magneto with a greater height of the shaft above the mounting base. I had a normal D4, which I gave to Ray Whyte for his big 1907 shaft drive T head Mercedes. You will know the year from the serial number, which were consecutive for Bosch for all models, and the lists are about. Then it will be for a big car. Link to post Share on other sites
Stutz in the UK 10 Posted August 17, 2012 Share Posted August 17, 2012 My 1917 Stutz has this mag Link to post Share on other sites
john7121 10 Posted December 19, 2013 Share Posted December 19, 2013 I'd like to buy your Bosch DU4 Dual Mag if you'd like to sell it pleaseThsnk youJohn Link to post Share on other sites
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