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Registered
Join Date: May 2016
Location: Ontario, Canada
Posts: 175
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Jonny,
-Clicked the link and got some nice adverts wanting me to sign up for twitter. Can you publish this on something that Donald Trump doesn't use? How about youtube? I'm not on Spybook or twitter. -I'd love to see how the 4 or 5 high wattage sparks over almost 600µS (sometimes longer)work on my unit against your two, short duration high wattage blasts 400µS apart. The best test would be a fuel mileage test over an extended period with different quality fuels in different engine types, mixtures etc. I think I would have your system beaten (or any other CDI or inductive system for that matter). Of course, mine only makes a spark, no other bells or whistles, but the price reflects that. -This is all good fun except for some of the nastiness this topic seems to spawn, Fred b Quote:
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10-19-2017, 03:30 PM
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Registered
Join Date: Jul 2013
Location: South East England
Posts: 1,697
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Quote:
 Here's the results. It made 230HP on a standard Bosch box but there was a dip in Torque in the mid range. The CDI+ produced 240 HP and the mapping got rid of the torque dip.   
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10-20-2017, 09:52 AM
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Registered
Join Date: May 2016
Location: Ontario, Canada
Posts: 175
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Jonny,
-Good work and thankyou for the results of your latest testing. I have only ever run Hyland CDIs, or later variants built by my father on my old cars until I developed this one. (The exception was an Accel 300+ CDI that I ran on my Lada Niva but it wouldn't function below 10V so I ran it from a dedicated motorcycle battery) -The differences between standard Kettering and my father's CDIs were always quite noticeable especially on cars that ran in Kettering for awhile letting the plugs load up. I have included a scope picture that I took today of the 1963 Hyland unit I ran on my Morgan Plus4 for a few years before putting one of my own units on the car. You can see that the spark duration is about 280µS with this coil, but it is not as powerful as the unit I build and of course the duration much shorter. Still, it has a longer duration than any CDI I know of built up to about 1970. Now, the interesting thing is, that after I swapped the Hyland for one of my variants of the original design, I could feel the difference, and it manifested itself in faster throttle response. I always thought the throttle response with SU carbs was sluggish compared to other carb designs, but the response is near instantaneous with this updated CDI. Too bad I don't have easy access to a dynamometer, but even that measuring tool may not tell the whole story. So the question is; is it the extra duration or the slightly higher power of my CDI compared to the original Hyland, or the absence of a good quality second negative spark with the Hyland? I do know that the spark of my unit is very hard to blow out so perhaps that is it, but I really do not know. -I have one dyno sheet that shows how my CDI compares to standard Kettering on a Morgan Plus8 and the increase in power over Kettering is about 4%. Results vary depending on the engine and the ignition system it replaces. On this particular individual's car, my CDI works much better than the MSD 6A he had been running. I appreciate that he took the time, effort, and expense to do a dyno comparison. Fred  
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10-20-2017, 03:33 PM
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