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Multi cylinder ignition systems

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Roger B:

--- Quote ---Edit Jo: The following has been extracted from Vixen's Mercedes-Benz W165 Grand Prix engine in 1:3 scale thread so you can discuss multi cylinder ignition systems. Roger's was the first item from Mikes thread:
--- End quote ---

Small ignition systems are an interesting problem, as well as the voltage withstand you also need an energy store. This is the iron core in an ignition coil or magneto and the capacitor in a CDI system. There will be a limit on how small you can make a coil or magneto as there is a minimum energy is required to ignite the mixture.

BillTodd:
I wondered if one could use one of those modern car type plug-cap type ignition coils with appropriate driver?

Vixen:
Thank you Roger and Bill,

You are quite correct. There is far more to small ignition systems than just the voltage. If you and our other members wish to start a discussion regarding small ignition systems, I will open a separate topic, which will be easier for everyone to find, rather than hidden with this dedicated engine build log.

Bill, the modern COP (Coil over Plug) ignition system and multiple CDI units were developed to eliminate the need for the spark distributor completely. I am sure modern COP and CDI systems will provide fertile ground for those interested in their development. A separate small ignition system topic would be a better place to discus their design and development

Cheers

Mike

petertha:

--- Quote from: Vixen on November 16, 2024, 10:34:11 AM ---There is far more to small ignition systems than just the voltage. If you and our other members wish to start a discussion regarding small ignition systems, I will open a separate topic, which will be easier for everyone to find, rather than hidden with this dedicated engine build log.

Bill, the modern COP (Coil over Plug) ignition system and multiple CDI units were developed to eliminate the need for the spark distributor completely. I am sure modern COP and CDI systems will provide fertile ground for those interested in their development. A separate small ignition system topic would be a better place to discus their design and development

--- End quote ---

I would welcome a dedicated post on this subject, specifically (my own selfish interest) distributers in conjunction with CDI. Project examples, do's & don'ts, hall effect triggers, wiring, plugs, ancillaries, advance/retard considerations, supply sources.... Of course coils are another way to go, so a great place to discuss differences. There seems to be more electrical hardware options and/or supplier changes in recent years. I have harvested a few designs & tips from various posts by others with more spark knowledge & practical experience as they come up on specific builds or ignition debugging, but it would be great to consolidate more details & collective wisdom. Special mention to Mike (Vixen) who was kind enough to share some pictures & overview of his CDI/distributer via PM of just such a retrofit. Replicating that for my purposes is on my near term to do list. (Hope you don't mind me showing your nice work as example.)

Vixen:
As Jo said in the opening post, we have opened this new topic, titled 'Multi cylinder ignition systems'. : https://www.modelenginemaker.com/index.php/topic,12062.0.html

Here is the place and opportunity for our MEM members to discus anything and everything relation to multi cylinder ignition systems. This can include, but not limited to: magnetic Hall sensors types and configurations, points, ignition coils, CDI ignition, magneto ignition, batteries, spark plugs wires and connectors. Also distributor design and alternatives to the distributor.

Over to you    :thinking: :thinking:

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