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Rick
Site Admin
Joined: 27 Apr 2005
Posts: 22447
Location: UK
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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 Posted: Wed Jun 21, 2023 5:31 pm Post subject: |
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No
They are all about .022uF need to be 600V working, as I may have mentioned before, I have a .021uf polyester capacitor on fly leads with clips, so that in the event of a condenser failure, I can simply clip on to the coil, zero dismantling!
dave |
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Ray White
Joined: 02 Dec 2014
Posts: 6319
Location: Derby
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| Posted: Wed Jun 21, 2023 5:52 pm Post subject: Re: Condensers - do they vary much? |
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| Rick wrote: | Hi
Pondering the swap of the condenser on the 4CV, I've several new unlabelled condensers in a box but it's impossible to know exactly what they were originally for. Do they vary much in spec? Is it critical to buy a replacement where the car its for is listed? The Renault is still on 6v.
thanks, RJ |
Hi Rick.. The condenser will not care if it is handling 6 or 12 volts. They all do the same thing which is to cope with the reverse EMF voltage made by the coil as it's magnetic field collapses when the points open. They are generally insulated to take up to a 200 volts; roughly twice the amount they are subjected to in service.
Unfortunately the build quality is what we have come to expect from new parts made overseas, so I would prefer to pay a bit more and get a good quality one. The distributor Doctor would be my first choice.
If you have a selection of unknown condensers to choose from, you might as well suck it and see.
N.B. It is important to mount the condenser as close to the points as possible. |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Wed Jun 21, 2023 5:56 pm Post subject: Re: Condensers - do they vary much? |
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| Ray White wrote: | | N.B. It is important to mount the condenser as close to the points as possible. |
Why? |
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Ray White
Joined: 02 Dec 2014
Posts: 6319
Location: Derby
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| Posted: Wed Jun 21, 2023 7:19 pm Post subject: Re: Condensers - do they vary much? |
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| ukdave2002 wrote: | | Ray White wrote: | | N.B. It is important to mount the condenser as close to the points as possible. |
Why? |
Because the further away from the distributor you position the condenser the inductance of the wire from the condenser to the points will detract from the efficiency of their operation. That is why the condenser is usually located next to or close to the points. |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4105
Location: South Cheshire
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| Posted: Thu Jun 22, 2023 8:24 am Post subject: Re: Condensers - do they vary much? |
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| Ray White wrote: | | ukdave2002 wrote: | | Ray White wrote: | | N.B. It is important to mount the condenser as close to the points as possible. |
Why? |
Because the further away from the distributor you position the condenser the inductance of the wire from the condenser to the points will detract from the efficiency of their operation. That is why the condenser is usually located next to or close to the points. |
I suspected that would be the answer  Although I think it would have to be quite a distance away to make a material difference? Certainly my "get you home" capacitors on fly leads must add a couple of feet to the wiring distance to the points with out impact, also there are many vehicles with Transistor Assist (Electronic ignition) where the module is mounted on the bulkhead; some distance from the distributor.
Dave |
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Rick
Site Admin
Joined: 27 Apr 2005
Posts: 22447
Location: UK
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alastairq
Joined: 14 Oct 2016
Posts: 1954
Location: East Yorkshire
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| Posted: Sat Jun 24, 2023 12:47 pm Post subject: |
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If the coil is 'oil-filled', then really it should be mounted in a vertical position. Many folk like to mount their coils horizontally....
_________________
Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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Ray White
Joined: 02 Dec 2014
Posts: 6319
Location: Derby
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| Posted: Sat Jun 24, 2023 12:52 pm Post subject: |
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| Rick wrote: | Thanks gents.
With a new coil I'm still getting the engine cutting out when it gets hot, and the new coil (now mounted away from the engine) is getting hot too.
The condenser is mounted directly to the outside of the dizzy (which itself gets very hot indeed), would a failing condenser cause the coil to run over hot too?
thanks, RJ |
If the distributor is getting hot - and it's not just from the engine/exhaust - I would think there might be a poor earth. Try running an earth wire from the distributor. The body of the coil isn't earthed but earthing the distributor might just help. I would also make sure there is an earth wire from the gearbox to the battery or close by. It might just be a matter of resistance build up.
Also check the plug gap.
Too small and there is insufficient room for the mixture between the electrodes so the spark may not ignite it.
too wide and the spark has insufficient energy to ignite the charge.
Either way you get a misfire. The problem we have is that the recommended gap may not be suitable for today's petrol so it is all a bit hit and miss. (pardon the pun). |
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