[Healeys] Spark plug gap

[Alan Seigrist]

But if the modern plug is designed for a larger gap, why not use it?

On Thu, 4 May 2023 at 5:15 AM, josef-eckert--- via Healeys <
healeys at autox.team.net> wrote:

> Spark plugs are designed and tested to be used with the gap given by the
> producer of the spark plug.
>
> When you widen the gap the plug gets hotter as it is designed for and the
> electrode can melt or wear very fast.
>
> Its a very short win you gain modifying them.
>
> I never understand why people think they are better engineers and know
> better than the designers of the system they use.
>
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>
> Josef
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> -----Original-Nachricht-----
>
> Betreff: [Healeys] Spark plug gap
>
> Datum: 2023-05-03T21:39:57+0200
>
> Von: "Simon Lachlan via Healeys" <healeys at autox.team.net>
>
> An: "'Healeys'" <healeys at autox.team.net>
>
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> I run my MkII BT7 on NGK BP6ES which were recommended by some of the wise
> ones on this list.
>
> The car has a “Sports” coil and a 123Ignition distributor. DW fast road
> cam…etc
>
> Now, talking of “recommended”, the rolling road guys told me to set the
> plugs at 0.028” and pooh-poohed anything bigger when I suggested that I’d
> heard of much greater gaps with my approximate setup.
>
> So, I went with 0.028.
>
> The other day, I decided to experiment and set my spare set at 0.032”.
> Same NGKs, no mileage on them..decent plugs. Anyhow, it made a very
> surprising difference. All round performance is much enhanced.
>
> Despite it’s 3:54 diff and 28% OD, it was never sluggish on our local
> hills. But now it fairly zooms up them.
>
> To be frank, all a bit of a surprise.
>
> Not boasting…just putting that out there in case anyone else is thinking
> of going up a few thou…..
>
> When I asked about gaps a few years back, some of the suggestions were
> near 0.040”. Surely that a bit much?
>
> Simon
> 
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