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 captors 
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Firing on two.

Joined: February 10th, 2009, 10:12 pm
Posts: 155
Location: viseu - PT
Post captors
Captors definitely don´t like hot weather.
When my 2cv engine (652 visa) is hot I have some difficulty in restarting it after stopping and parking.
Before, I used to park it under a shadow, sometimes leaving the bonnet open. That would usually work if the temperature wasn´t too hot.
Yesterday, as I was in a hurry, I decided to drop half a liter of cold water on both captors. As soon as I restarted the engine it immediately started to work.
Could you find any explanation for this curious phenomenon?


September 29th, 2018, 5:21 pm
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Firing on two.
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Joined: February 22nd, 2012, 10:34 am
Posts: 356
Location: Greece
Post Re: captors
Captors?
What is this?

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September 29th, 2018, 6:26 pm
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Firing on two.

Joined: February 10th, 2009, 10:12 pm
Posts: 155
Location: viseu - PT
Post Re: captors
Sorry, in English the word is probably sensor...


September 29th, 2018, 6:56 pm
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Firing on two.
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Joined: February 17th, 2009, 8:43 pm
Posts: 463
Location: NOrWAY
Post Re: captors
Sensors like that are temperature sensitive, when failing. And the Visa types are known for failing. (Like the flywheel sensors on the CX 25 injection models)

There's an adaptor for the ²2cv electronic ignitions to fit the Visa engine. Then you can remove the whole visa ignition system, I believe.

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Five 2CV's, DS 21 ieh Pallas -70, DS 23 h Pallas -75, CX 25 GTi automatic -89, XM 2,0i -90


September 29th, 2018, 9:39 pm
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2CV Fan

Joined: April 20th, 2017, 10:55 pm
Posts: 97
Post Re: captors
vitor wrote:
Sorry, in English the word is probably sensor...


Do you mean capacitor? The small cylindrical item bolted to the contact breaker points box.

Or is it the coil, from which the high tension leads go to the spark plugs?

Or the spark plug caps?

It does not sound like pouring cold water on the above items would do much good!


September 29th, 2018, 10:06 pm
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Firing on two.

Joined: December 21st, 2014, 7:33 pm
Posts: 591
Location: Rhayader Mid Wales
Post Re: captors
https://en.wikipedia.org/wiki/Citro%C3%ABn_Visa Model, History and Design :) .


September 29th, 2018, 10:30 pm
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Firing on two.

Joined: February 10th, 2009, 10:12 pm
Posts: 155
Location: viseu - PT
Post Re: captors
Erik, my point is that they fail because of getting too hot. Aren't I right?
Don't forget the Visa engine adaptation to a 2cv involves the Motorolla "electronic" ignition and the two three-wire sensors. Since on a 2cv they have to be mounted very close to the brake disks, in Summer there is an extremely hot environment surrounding them. And they just don't do their work because of this ...
"There's an adaptor for the ²2cv electronic ignitions to fit the Visa engine" - where can I find it Erik? I've already tried some alternatives but the original system seems to work better after all...


September 29th, 2018, 10:53 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 775
Location: Exeter, Devon
Post Re: captors
Does this help?

http://forum.2cv.nl/viewtopic.php?t=5464

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


September 29th, 2018, 11:02 pm
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Firing on two.

Joined: April 9th, 2010, 12:21 am
Posts: 420
Location: West Sussex
Post Re: captors
That's a useful link Roger. :-)

I have a Visa engine in my AK. I used the Burton bracket to mount the sensors (and had to modify it because it held the sensors so they pressed against the flywheel!...and the bracket didn't leave room for the brake drum!). Anyway, I also had problems with the sensors overheating, so I adapted a disc cowling, fed from the (2cv disc-type) fan cowling, and mounted vertically around the sensors and the side of the flywheel & bell-housing.
Before initially fitting the Visa engine, I had an adapter made to go in the end of the camshaft, using the 123 type adapter as a pattern but adding the necessary extension to mount 2cv bob-weights and points cam, so that I could fit points. (I've lost faith in 123). I modified a points box to hold it centrally against the flat Visa casing, so it didn't float around sideways when setting up dwell & timing. I then wired the two ignition systems so that I could easily switch from one to the other. I had to use points soon after fitting the engine, when the sensors failed. I haven't needed to since fitting the cooling cowling, about 20,000 kms ago.


September 30th, 2018, 2:38 am
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Joined: April 20th, 2017, 10:55 pm
Posts: 97
Post Re: captors
A Visa! My commiserations . . . :|


September 30th, 2018, 10:03 am
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