nyleeloise Posted March 15, 2022 Share Posted March 15, 2022 What is it? I think its a distributor, but not sure. On the brown button on top it saids bosch. What year vehicle was this used on? Link to comment Share on other sites More sharing options...
Leif Holmberg Posted March 15, 2022 Share Posted March 15, 2022 Looks close to this 4 cyl.magneto. https://www.ebay.com/itm/224436692006 1 Link to comment Share on other sites More sharing options...
Craig Gillingham Posted March 15, 2022 Share Posted March 15, 2022 It's a magneto cap, but for a 2-spark magneto, not a dual. It's used to fire two simultaneous at the same time; as used on T-head engines, two plug per cylinder engines, etc. 1 Link to comment Share on other sites More sharing options...
Peter R. Posted March 15, 2022 Share Posted March 15, 2022 American Bosch 4 cyl. 2-spark magneto cap Probably for a DU-4 two spark magneto (would have to check). Link to comment Share on other sites More sharing options...
nyleeloise Posted March 15, 2022 Author Share Posted March 15, 2022 Tk you Craig, Peter, and leif 1 Link to comment Share on other sites More sharing options...
dustycrusty Posted March 15, 2022 Share Posted March 15, 2022 The parts are for a dual ignition Bosch ZR4 magneto, popular with everything from early aeroplanes to high-dollar pre-war autos and even as a speed part on modified Model "T" Fords. It allowed you to start on steady-current battery ignition (via that unusual central lead on the cap), then switch over to the magneto when running. Heres a complete unit on a Model "T" engine front cover designed to accept an external magneto drive, and a fairly primitive, basic schematic- probably from an early Chiltons! These days, complete, useable ZR4s are not cheap... Link to comment Share on other sites More sharing options...
nyleeloise Posted March 15, 2022 Author Share Posted March 15, 2022 Tk you I should of realized what it was It was sitting next to a ZR-4 magneto Tk you again dustycrusty 1 Link to comment Share on other sites More sharing options...
edinmass Posted March 15, 2022 Share Posted March 15, 2022 PM sent……..Ed. 1 Link to comment Share on other sites More sharing options...
Peter R. Posted March 15, 2022 Share Posted March 15, 2022 (edited) 5 hours ago, dustycrusty said: The parts are for a dual ignition Bosch ZR4 magneto Yep, definitely ZR4 2-Spark Dual (a 2-Spark magneto is not necessarily Dual and a single spark magneto can be dual too), the other Bosch 2-spark magneto would be DR4.....not DU4..... Edited March 15, 2022 by Peter R. (see edit history) 1 Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 15, 2022 Share Posted March 15, 2022 6 hours ago, edinmass said: PM sent……..Ed. I was just thinking you were talking about one of these. Glad you saw it. Dandy Dave! 1 Link to comment Share on other sites More sharing options...
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