cymaz Posted November 8, 2014 Share Posted November 8, 2014 I'm thinking of converting a 4 inline glow motor to gas. However it needs a four line ignition module. Can I string two dual ignitions together???? If so how can it be done? Thanks Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted November 8, 2014 Share Posted November 8, 2014 Suppose you could, but as long as the cylinders on each row fire together, i.e front then rear (as I reckon they all do), then you would need to put the hall sensors 180 degrees apart. Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 8, 2014 Author Share Posted November 8, 2014 Forgot to say that it is a four stroke and I think the firing order is 1342 Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted November 8, 2014 Share Posted November 8, 2014 Yes, if you put them 1 & 4 and 2 & 3 then when 1 fires 4 is at the top of the exhaust stroke and although it will spark it will do noting. May years ago when I was a youth I had a small twin cylinder 4 stroke motor bike that only had one coil, it used to fire both plugs together every revolution. I came out of the chip shop one night and the boys outside had swapped the plug caps over and were stood around sniggering, but somewhat surprised when it started up and ran fine Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted November 8, 2014 Share Posted November 8, 2014 Is the engine a OS Pegasus?No it can't be, as that's a flat 4. Have you got a pic of the engine? I like engines. Edited By Paul Marsh on 08/11/2014 17:52:01 Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 8, 2014 Author Share Posted November 8, 2014 It is home built by the same chap who built This I will post pictures Sunday or soon after. By the way, just to whet your appetites, it's twin overhead cam! Edited By cymaz on 08/11/2014 19:06:48 Quote Link to comment Share on other sites More sharing options...
Mark Lubbock Posted November 13, 2014 Share Posted November 13, 2014 Most full size four cylinder motorcycle engines and many modern cars use two double ended coils, 1 connected to cylinders 1-4, the other to 2-3, the ignition pulses (points or electronic) are driven from the crankshaft so you get a "wasted spark" on all cylinders on the exhaust stroke. assuming your engine is 1342 as you say (outer pistons rising together as the inner two fall) this is the system you need as you only need two ignition circuits. if you cant get double ended coil, try a motorcycle breaker, ok for bench running but a bit heavy for flying, or you could connect 2 coils in parallel (twice) which is really what a double ended coil is. hope this helps and good luck. Quote Link to comment Share on other sites More sharing options...
cymaz Posted November 13, 2014 Author Share Posted November 13, 2014 Many thanks Mark, I will try the engine on glow first. But it will be easy to convert. And the creator of the engine will be up for it as well, should the need arise. Quote Link to comment Share on other sites More sharing options...
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