[Healeys] Spark plug gap

Kees Oudesluijs coudesluijs at chello.nl
Fri May 5 03:28:39 MDT 2023 

In extreme cases you may burn a hole in your pistons.
Kees



Op 4-5-2023 om 21:58 schreef josef-eckert--- via Healeys:
>
> Richard,
> Just do what you want. Its your car, your engine, I do not mind.
>
> Josef
>
> -----Original-Nachricht-----
>
> Betreff: Re: [Healeys] Spark plug gap
>
> Datum: 2023-05-04T16:10:56+0200
>
> Von: "Ricchardd Mayor" <boyracer466 at gmail.com>
>
> An: "josef-eckert at t-online.de" <josef-eckert at t-online.de>
>
> On no!  Who knew that gapping your plugs at .032 would ruin your 
> engine. Thank you Josef for saving us.
> Richard Mayor
> boyracer466 at gmail.com
>
>
>     On May 4, 2023, at 4:43 AM, josef-eckert--- via Healeys
>     <healeys at autox.team.net> wrote:
>
>     Sorry, I am out here. This guy wants to play till the engine is shot.
>
>     -----Original-Nachricht-----
>     Betreff: RE: [Healeys] Spark plug gap
>     Datum: 2023-05-04T12:45:37+0200
>     Von: "simon.lachlan at alexarevel.plus.com"
>     <simon.lachlan at alexarevel.plus.com>
>     An: "josef-eckert at t-online.de" <josef-eckert at t-online.de>
>
>     Thanks for that. I’ll certainly bear it in mind. Likewise, I’ll
>     keep a close eye on my engine’s temperature. The latter is quite
>     well protected with a modern rad, all the correct baffles, 5 blade
>     fan plus electronic fan. But, as I said, I’ll keep an eye on it.
>
>     Someone mentioned that he used “Iridium” plugs from NGK. I googled
>     them….horribly expensive. Can they be worth it in our old cars?
>
>     Simon
>
>     *From:*josef-eckert at t-online.de <josef-eckert at t-online.de>
>     *Sent:* 04 May 2023 07:06
>     *To:* simon.lachlan at alexarevel.plus.com; Healey, Forum
>     <healeys at autox.team.net>
>     *Subject:* AW: [Healeys] Spark plug gap
>
>     For me, i prefer Champion plugs plugs to NGK, but that´s a matter
>     of taste. I think both, Champion and NGK, are of similar quality.
>     Matter of taste, as I wrote. But NOT the car manufacturer
>     determines the plug gap, its the plug manufacturer. Definitely the
>     car manufacturer takes this for his specs in the workshop manual.
>     There is to much hype about plugs anyway. I am working as a
>     professional, Elecrtonics and Elecrtrcian engineer, at a big
>     classic car parts supplier here in Europe and I never go away from
>     the given plug gap as set by the plug manufacturer. Austin-Healey
>     engines  are not high tech, they are tractor engines and can take
>     a lot of misfit, but anyway BMC knew at the time what´s best to do
>     with them, even its printed 60 or 70 years ago.
>     Some people try to adjust the fuel mixture with a CO-tester. You
>     can do that, but it doesn´t give best results for road use,
>     especially in hotter climates and high above sea level.
>     When you are very good in engine engineering and have all the
>     tools you can try to find some more horsepower in your engine, but
>     you always pay that with some more heat produced, which is not at
>     all good for our old BMC engines.
>
>     Josef
>
>     -----Original-Nachricht-----
>     Betreff: RE: [Healeys] Spark plug gap
>     Datum: 2023-05-04T00:06:58+0200
>     Von: "simon.lachlan at alexarevel.plus.com"
>     <simon.lachlan at alexarevel.plus.com>
>     An: "josef-eckert at t-online.de" <josef-eckert at t-online.de>
>
>     You may be right. Not sure.
>
>     Actually I thought that the gap was determined by the car’s
>     manufacturer ie one could expect to find the same plug in two
>     different cars and to find that the recommended gap was not the
>     same for each car.
>
>     Likewise, the BMC manual suggests Champion plugs at 0.024” to
>     0.026” and that was some 60+ years ago. I’ve always been told that
>     Champion plugs aren’t the best in the world and I’m sure that a
>     modern NGK can stand a little more heat than the Champions that
>     were around 60 years ago.
>
>     Anyhow, I’ll keep an eye on them. I’m a pretty tame driver so
>     there won’t be undue stress under the bonnet.
>
>     Simon
>
>     *From:*josef-eckert at t-online.de <josef-eckert at t-online.de>
>     *Sent:* 03 May 2023 20:56
>     *To:* simon.lachlan at alexarevel.plus.com; healeys at autox.team.net
>     *Subject:* AW: [Healeys] Spark plug gap
>
>     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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>
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