[Healeys] Spark plug gap

[josef-eckert at t-online.de]

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.
 
Josef
 
 
 
 
-----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>
 
 
 

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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