Ignition voltage in a waste spark system.

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SUMMARY

The discussion centers on the ignition voltage required in a waste spark system, specifically in a Citroën 2CV with a points ignition system and a dual output ignition coil. Participants clarify that while one cylinder requires a lower voltage for ignition during the exhaust stroke, the coil can still generate sufficient voltage for the other cylinder under compression due to the series connection of the coils. The spark is initiated by a high voltage that ionizes the gas in the spark gap, allowing current to flow, which is essential for maintaining the spark. The conversation highlights the importance of understanding the dynamics of voltage and current in ignition systems.

PREREQUISITES
  • Understanding of ignition systems, specifically waste spark configurations.
  • Knowledge of high voltage (HV) coil operation and spark plug functionality.
  • Familiarity with electrical concepts such as voltage, current, and resistance.
  • Basic principles of gas ionization and its role in spark generation.
NEXT STEPS
  • Research "waste spark ignition systems" to understand their mechanics and applications.
  • Study "spark plug ionization" to learn how gas ionization affects ignition performance.
  • Explore "high voltage ignition coil design" to gain insights into coil functionality and efficiency.
  • Investigate "electrical characteristics of spark plugs" to comprehend their role in ignition circuits.
USEFUL FOR

Automotive engineers, mechanics, and enthusiasts interested in vintage car ignition systems, particularly those working with Citroën 2CVs or similar waste spark configurations.

  • #31
.
Vk6kro, Sophiecentaur and Bob_S

I really thank you for advising me so wisely on this matter.

Obviously, something is wrong in my test and the only place I cannot verify the "lost spark" is inside the coil.

I do not know why, but I discarded that possibility, as I know of several 2CV drivers who because of a failure in plug or any other part in that branch, drove hundreds of kilometers without damaging (or some?) the ignition coil.

For that, I am with your opinion, but I was really confused for the matter I mentioned.

Thanks a lot you all
 
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  • #32
CHICAGO said:
.
Vk6kro, Sophiecentaur and Bob_S
I do not know why, but I discarded that possibility, as I know of several 2CV drivers who because of a failure in plug or any other part in that branch, drove hundreds of kilometers without damaging (or some?) the ignition coil.

A 301cc single cylinder engine! Wow.
2CVs just go on and on. You just need to re-weld bits now and again - and again - and again!
Probably the most stylish car that ever there was.
 
  • #33
sophiecentaur said:
A 301cc single cylinder engine! Wow.
2CVs just go on and on. You just need to re-weld bits now and again - and again - and again!
Probably the most stylish car that ever there was.
A 2CV is a "deux chevaux" only if both horses are pulling; otherwise it is an un chevaux.

Bob S
 
  • #34
Bob S,
reckon it would be more like a broken down nag, because of pumping losses in that dead cylinder.

Happened on this one a bit late, but I'm wondering if CHICAGO ever did post his findings on a 2CV-related forum?

Ken.

< http://www.flickr.com/photos/30132857@N06/3654939718/ >

( Still trying to work out how anyone could be so lacking in sympathy for the machinery that they'd plod on for hundreds of kilometres with the engine turning out less than 50% of its rated 28 bhp. )




Bob S said:
A 2CV is a "deux chevaux" only if both horses are pulling; otherwise it is an un chevaux.

Bob S
 
  • #35
I might suggest that one would not notice the difference between 'under-powered' and 'seriously under-powered'. I had one for several years and lack of power never surprised me. You just never compete with anyone else on the road (except, perhaps ageing lady cyclists).
And we can do without hurtful references to "nags", thank you. You may need to have owned one to appreciate just how nice they are. I could 'take' a Ferrari on a road with speed bumps, any day!
 
  • #36
sophiecentaur,
I fear you have misunderstood me, as I've driven nothing except these little cars since 1979 and have made my living out of working on them since 1994, including selling UK manufactured components for them to customers in France.

That's what we refer to as 'Coals to Newcastle'.

If you'd looked at some of the other photographs on my Flickr pages, you'd probably have realized that I'm beyond help as far as A series Citroens are concerned... ;o)

Ken
sophiecentaur said:
I might suggest that one would not notice the difference between 'under-powered' and 'seriously under-powered'. I had one for several years and lack of power never surprised me. You just never compete with anyone else on the road (except, perhaps ageing lady cyclists).
And we can do without hurtful references to "nags", thank you. You may need to have owned one to appreciate just how nice they are. I could 'take' a Ferrari on a road with speed bumps, any day!
 
  • #37
Also. Alles ist klaar.
 

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