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COP vs Coils


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Right Lads,

I know nothing about spark and EFI - Seems like everyone wants COP ( Coil on Plug) these days. Are there any downsides? Cleaner engine room, stronger spark - Im going EFI on an old 3.0 930 turbo engine and trying to decide here.

Anyone still swearing to Coils , or is this where all EFI builds are heading for years to come?

Axel 

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You will get endless opinions but one thing I have a problem with is COP on the 911 engine but probably not for the reason you are thinking.

Most COP units have a stated maximum operational temperature of around 160-180 deg C.  This is most likely because the expected use is in a water cooled cylinder head.  The cylinder head temps in air cooled engines are much higher, 180 deg C is not uncommon for 'normal' driving.  On a tweaked turbo in hot weather you could see 200 deg C.  As with most electronics, running hot reduces working life. 

 If you are going to twin plug, you'd have even higher temps on the exhaust side.  Then there is the added problem of how do you know if one of you COP units has failed?  E.g. if 11 out of 12 plugs are ok but one poor cylinder would effectively be running with retarded ignition which will make it run hotter.  I think this would be hard to tell from the driver's seat, until the piston gets a hole in it!.

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yeah I agree, also you have high failure rates in typical COPs used like BMW / Audi Beru plugs... which doesnt fill me with confidence

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Jonny - what kind of ignition system would you recommend for a 3 Liter turbo on EFI? 

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On 20/01/2024 at 09:37, Jonny Hart said:

I have a horse in this race obviously with CDI+.   I would use the EFI brain to trigger a standard (CDI) or uprated (CDI+) unit.     

And use a wasted spark setup or something different?

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Like These ?recommended by Bosch Motorsport.

Okay for both inductive and CDI..

Bosch 3x2 coil.jpeg

Edited by axel
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Nothing wrong with original design coils,they work and look much better than cop and wasted spark coil packs ,usually with gaudy coloured leads.my car starts ok,hot or cold and revs to 7300.looks nicer to me.0BFA6F61-CBC6-4A72-AF0A-53626507D221.thumb.png.8804bcea39517243043373fe6729fc98.png

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On 22/01/2024 at 17:38, axel said:

Like These ?recommended by Bosch Motorsport.

Okay for both inductive and CDI..

Bosch 3x2 coil.jpeg

The Specialist Component set up on my car uses a similar coil pack, think is was form an Vauxhall Insignia V6

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15 minutes ago, axel said:

link to those COPs phill?

The Ford EDIS is not COP it’s a coil pack. Just search Ford EDIS coil pack, there are loads.

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ahh yes I see that now sorry

Edited by axel
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