Ignition coils

[ghost123uk]

Following on from a current thread about getting a new coil, Chris (CJH) said =

There's also some test data in the Brickwerks listing:

Test data.
Primary resistance [between terminals 1 & 15] - .5Ω to .8Ω
Secondary resistance [between terminals 1 & 4] - 2.4kΩ to 3.5kΩ

I never did understand this. Why are there 2 types of coil specs when all the other associated ignition components are the same (to the best of my knowledge)

My van does not have a coil issue, but I do know the coil is black and has no sticker on it, so if I ever did need a coil, how would I know which one to get (86 DG)

Note this is not a problem, just a blog / yack on the subject for future use and for future "searches".

[NicBeeee]

The secondary seems a lot higher on the grey compared to the green, perhaps best to test prior to it going faulty

http://www.brickwerks.co.uk/index.php/b ... g/tag/t25/" onclick="window.open(this.href);return false;

[kennyjackett]

I didn't see that on Brickwerks, thanks mate. That makes my saturday job a hell of a lot easier for this newbie Cheers

[bigherb]

The grey sticker with the higher secondary resistance and capable of higher HT voltage is for long life plugs and extended servicing, it can fire a worn plug with larger gaps.

[CJH]

The grey sticker with the higher secondary resistance and capable of higher HT voltage is for long life plugs and extended servicing, it can fire a worn plug with larger gaps.

Any reason why it shouldn't be used as a replacement for the green stickered version?

[bigherb]

The grey sticker with the higher secondary resistance and capable of higher HT voltage is for long life plugs and extended servicing, it can fire a worn plug with larger gaps.

Any reason why it shouldn't be used as a replacement for the green stickered version?

Not really apart from it won't fit the early coils unless you change the HT lead connection and the HT leads need to be in good order otherwise the higher voltage will find an easier route if it is less than that needed to fire the plug. Or the other way round fit a green one if you don't go in for extended servicing and change the plugs regularly.

[itchyfeet]

The grey sticker with the higher secondary resistance and capable of higher HT voltage is for long life plugs and extended servicing, it can fire a worn plug with larger gaps.

Thats worth knowing
thanks

[ghost123uk]

Yes thanks for clearing that up, it's been puzzling me for years (knowing that other than the lead fittings, everything else is the same !)

I think that simple bit of info should be in the wiki, but there is currently no relevant section and I don't know how to "add" a section (and don't want to risk messing the wiki up !)

[ghost123uk]

CovKid has now done a write up in the wiki about this HERE

"We" know that LPG requires a very healthy spark to fire properly, so I wonder if fitting a Grey (higher output) coil might be of any benefit when on gas ?

[CovKid]

Can't swear I've got it 100% correct but battled with it this morning, cross-referencing stuff generally. Happy to add anything I may have missed or omitted. I agree its worth putting in there as it can be confusing particularly if you end up with a half-breed ignition system like mine John. I think photos will help too. Mine is early type but due to endless fights with GSF, I've ended up with a mixture as their early leads just wouldn't reach. Took some sussing out!

[ghost123uk]

I am a bit confused re why one needs to change the type of king lead if swapping from Green to Grey (or visa versa) as per Brickwerks words =

[E D I T = Seems it does not say this on the Brickwerks site, but I am sure it did ]

However, the grey coil is not a direct swap/replacement unless you also change the HT lead connection.

They are both listed as having the more modern type connection with the centre pin

Just trying to clarify what is different between the physical connections on Green V Grey coils.

[CovKid]

I can't see how they can be different either. I can see early/late swaps being a problem but not between green and grey later ones as they're both PIN. I have removed it in the absence of better information.

[Simon Baxter]

I am a bit confused re why one needs to change the type of king lead if swapping from Green to Grey (or visa versa) as per Brickwerks words =

However, the grey coil is not a direct swap/replacement unless you also change the HT lead connection.


They are both listed as having the more modern type connection with the centre pin

Just trying to clarify what is different between the physical connections on Green V Grey coils.

Where does it say this?
I'll E D I T it.

[ghost123uk]

I am a bit confused re why one needs to change the type of king lead if swapping from Green to Grey (or visa versa) as per Brickwerks words =

However, the grey coil is not a direct swap/replacement unless you also change the HT lead connection.

They are both listed as having the more modern type connection with the centre pin

Just trying to clarify what is different between the physical connections on Green V Grey coils.

Where does it say this?
I'll E D I T it.

Umm, sorry Simon, I cannot find it now (looked around for ages) I am pretty sure that would have been a direct cut and paste, but obviously summat got screwed somewhere I have edited my post ^^^ to reflect the error.

[bigherb]

The original early coil is also a green sticker version.