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Devils Advocate
Firing on two.
Joined: July 26th, 2009, 3:36 pm
Posts: 1019
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 What's this thing on my carb... and why doesn't my Haynes manual make any mention of it?   I think I've seen it 'pulse' back and forth during cranking, and it looks as tho' it acts on the choke lever (or, more likely, the choke lever acts on it when engaged), but what does it do?! Ta much
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| July 22nd, 2010, 3:29 pm |
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toomany2cvs
Firing on two.
Joined: December 26th, 2008, 9:40 pm
Posts: 3332
Location: Surrounded by 2cvs...
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Re: What's this thing on my carb... Devils Advocate wrote: I think I've seen it 'pulse' back and forth during cranking, and it looks as tho' it acts on the choke lever Yup. As vac rises, it pulls the choke off a bit. Quote: but what does it do?! Fall off, mainly - and it makes such a horrible noise when it gets stuck between block and flywheel.
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Zookeeper of a miscellany of motorised silliness - from 0.75bhp to 9ft tall - now living life on the road in an old VW.
http://WhereverTheRoadGoes.com
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| July 22nd, 2010, 4:32 pm |
 
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Tim2cv
gym bunny
Joined: December 8th, 2008, 4:08 pm
Posts: 806
Location: Burton-upon-Trent
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Re: What's this thing on my carb... yes... it drops off   I cleaned the area and stuck gaffa tape over it... works fine!
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1299cc FTW
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| July 22nd, 2010, 5:19 pm |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
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Re: What's this thing on my carb... Its actually quite usefull given that many people dont know how to work a manual choke
it saves " over choking" your car when cold starting
older cars had a 2 stage choke which you had to hold the knob to get full choke and it returned to an intermediate stage of its own accord
Sean
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Kissing the Lash
"Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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| July 22nd, 2010, 6:35 pm |
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Devils Advocate
Firing on two.
Joined: July 26th, 2009, 3:36 pm
Posts: 1019
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Re: What's this thing on my carb... Toomany & Tim - what a double-act!  Thanks, folks. Well, I'd never have guessed. Pretty clever. Cheers.
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| July 22nd, 2010, 8:37 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: What's this thing on my carb... Not really that clever, as most of the 'choke pull-off' devices which haven't fallen off won't be doing much other than allowing air to leak into the manifold. The diaphragm was riveted directly onto the end of the operating rod, which tends to hammer itself apart in service. When that happens, the device is just some useless scrap metal screwed onto the top of the carb.  ken. Devils Advocate wrote: Well, I'd never have guessed. Pretty clever.
Cheers.
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| July 22nd, 2010, 10:21 pm |
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Jonathan
Firing on two.
Joined: January 1st, 2009, 7:37 pm
Posts: 4708
Location: Disunited Kingdom
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Re: What's this thing on my carb... Would that cause a lean mixure then? If so, would it be enough to cause 'pinking' at full throttle? ken wrote: other than allowing air to leak into the manifold.
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1988 built (1989 F-registered) Citroën 2CV-Six
2013 (63-Plate) VW Golf SE 1.4TSI BMT DSG7
1932 Morris Minor Open Two-Seater (The £100 car).
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| July 22nd, 2010, 11:11 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: What's this thing on my carb... Nope, because manifold vacuum is highest at tickover or on the over-run. First port of call when addressing pinking/pinging would be to check for too much ignition advance. A weak mixture, plugs with too hot a heat range and so on would be lower on the list. ken Jonathan wrote: Would that cause a lean mixure then? If so, would it be enough to cause 'pinking' at full throttle? ken wrote: other than allowing air to leak into the manifold.
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| July 22nd, 2010, 11:19 pm |
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Jonathan
Firing on two.
Joined: January 1st, 2009, 7:37 pm
Posts: 4708
Location: Disunited Kingdom
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Re: What's this thing on my carb... T'is on 123 which is retarded. The engine has done 193,000miles and has never been taken apart, so could it be coke build-up?
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1988 built (1989 F-registered) Citroën 2CV-Six
2013 (63-Plate) VW Golf SE 1.4TSI BMT DSG7
1932 Morris Minor Open Two-Seater (The £100 car).
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| July 22nd, 2010, 11:24 pm |
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Devils Advocate
Firing on two.
Joined: July 26th, 2009, 3:36 pm
Posts: 1019
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Re: What's this thing on my carb... I'm guessing that's possible, Jonathan - glowing carbon deposits could ignite the mixture as it's compressed even before the spark itself fires. Does the engine also 'run on' after turning off the ignition?
Has the ignition timing and points gap been checked? Always go for the obvious causes first.
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| July 23rd, 2010, 4:51 pm |
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