Show us your plugs, dirty or clean, doesn't mater.......

[bwaminispeed]

Here's mine out of my current daily driver, 79 Gumby Green (Java) with pretty much bog standard 1300 at .020 over, standard 630 camshaft, and, single 1.5 SU with GB needle.......

Pluggs are NGK BPR6EY-II

Ignition is standard points, carbon cables, and, Lucas 12v Sport Coil, nothing fancy......

Plugs are just over 8,000 Kilometres, and, just off a 10 Kilometre thrash (never knew it would do 120 KPH in 3rd gear)......

I think they look pretty good.....

Gumby-BPR6EY-II-.055-Gap-01.jpg

Gumby-BPR6EY-II-.055-Gap-02.jpg

[pdb]

Is it me, or does the gaps seem a bit big and uneven

[bwaminispeed]

Gap is indeed big, on purpose.......I run them at .055, nice big fat spark, nice idle, no misfire, coil runs cool, despite what some say.......

Started running wide gaps (.035 back then) almost as soon as I started driving in the late 60s, have no idea where I got the idea/information to do that, being no internet full of information back then.......About every 5-10 years, I'd bump it up another .005", then the Wizard book came out, and, kinda said, 'Yeah, wide gaps work"........About 2000 or so, I whacked them right up to .055", and have been there ever since.......

The unevenness is just camera distortion........

[DB1380]

Gap is indeed big, on purpose.......I run them at .055, nice big fat spark, nice idle, no misfire, coil runs cool, despite what some say.......

Started running wide gaps (.035 back then) almost as soon as I started driving in the late 60s, have no idea where I got the idea/information to do that, being no internet full of information back then.......About every 5-10 years, I'd bump it up another .005", then the Wizard book came out, and, kinda said, 'Yeah, wide gaps work"........About 2000 or so, I whacked them right up to .055", and have been there ever since.......

The unevenness is just camera distortion........

Very interesting that. You read so much about plugs these days..this that and the other. Im up for giving a wide gap ago.
Time to get the Feelers out..lol

[bwaminispeed]

Not many people know, but, the II after the plug number (on NGK plugs) indicates a wide gap plug, they are good up to .065 gap if you have the ignition to fire that large a gap, which, many modern cars do.......

Not sure if other manufacturers make specific Wide Gap plugs........

[bwaminispeed]

If you are going to do that, make sure your ignition system is right up to scratch......

I would recommend starting at .045, especially if running a Standard Lucas coil, and, run the car for a while, and, see how the car performs for you....

I would really recommend the NGK BPR6EY-II plugs, very reliable, long lasting, and, wider heat range than most plugs.......

The plugs in the pic have done over 8,000 Kilometres, and, are good for at least that many more......

[GraemeC]

The -11 means they come pre-gapped at 1.1mm (0.44")
-15 is pre-gapped at 1.5mm (0.60") and is the widest they do.

[bwaminispeed]

That's good information, thanks.....

Next time, I'll see if I can find some 15s, and knock them down .005"

[GraemeC]

-14 will be what you’re after ideally

https://www.sparkplugs.com/Data/uploads ... hart_1.jpg

[Fanfaniracing]

I have just taken out these:

85D5058C-95E6-4937-99B9-CF7B352823E7.jpeg

Bit lean?

What's your opinion?

[bwaminispeed]

To me, those look about perfect for normal everyday tootling about and occasional brisk acceleration, maybe a touch lean if you are constantly hard on the pedal......

If the car runs smoothly with no missfires or pinging, you are probably about right on.....

Gap looks about .035, personally, I would open them up a bit to at least .045. As stated in my original post, I run them at .055......

[Fanfaniracing]

Thanks for your opinion!

The car is a freshly built up 1293 with original Head, SW5, HS6 and Innocenti Exhaust system.

It runs perfect, no misfire, no holes in acceleration no nothing.

Just wondered why the spark plugs are so (in my feelings...) blaze...

May have to tune the needle a bit.

Thanks for reply!

[bwaminispeed]

They also look like they haven't done many miles, maybe not enough to develop full colour???

[Fanfaniracing]

Prety much exactly 370 miles

When i took them out this midday, they were darker...

Now took them out from a 10 mile run

[Terence]

.....

[IslandBlue]

Here's mine on a 1293 with standard ignition (45D), S profile cam with a standard head, HIF44 and K&N element in a modified standard housing. This in a 1989 Mini City although there's not much of the City left in truth... Not sure if I can talk about that on a Mk1 forum although it is a 12G949 block which I think is 60s albeit not Mini...

Done about 1,200 miles since rebuild, haven't quite made the rolling road yet what with current environment (essential journey? )

Gap is .035 from memory, not heard about the wider gap theory before!

Drives pretty well, possibly a little lean at the top end as it runs out of puff, but that might just be the head.... Set up with (i.e. by ) my friend Paul (Floormanager) who also very kindly rebuilt the gearbox and bolted it all together - top man.

[dodge44]

Here's mine on a 1293 with standard ignition (45D), S profile cam with a standard head, HIF44 and K&N element in a modified standard housing. This in a 1989 Mini City although there's not much of the City left in truth... Not sure if I can talk about that on a Mk1 forum although it is a 12G949 block which I think is 60s albeit not Mini...

<snip>

Rare engine block - Thin flange 12G949 casting dates from 1965 and is the earliest solid wall 1275 block. Initial use was as an in-line engine on MG Midgets / AH Sprites but in late 1967 the first transverse application appeared on ADO16 1300's but was short lived as the far more common thick flange 12G1279 casting soon replaced it. Have only seen 10 stud / 1 bolt engines in the 12H/199/xxxx series with the thin flange block. Be intrigued to know is there are any 9 stud versions out there as if so what engine number series?

[IslandBlue]

Here's mine on a 1293 with standard ignition (45D), S profile cam with a standard head, HIF44 and K&N element in a modified standard housing. This in a 1989 Mini City although there's not much of the City left in truth... Not sure if I can talk about that on a Mk1 forum although it is a 12G949 block which I think is 60s albeit not Mini...

<snip>

Rare engine block - Thin flange 12G949 casting dates from 1965 and is the earliest solid wall 1275 block. Initial use was as an in-line engine on MG Midgets / AH Sprites but in late 1967 the first transverse application appeared on ADO16 1300's but was short lived as the far more common thick flange 12G1279 casting soon replaced it. Have only seen 10 stud / 1 bolt engines in the 12H/199/xxxx series with the thin flange block. Be intrigued to know is there are any 9 stud versions out there as if so what engine number series?

That's interesting, mine is definitely 9 stud but no idea what the original engine number was or what it came out of. Seller suggested 1275GT but that seems unlikely unless it found its way into a car as a reconditioned lump.

[Fanfaniracing]

Pulled this out this morning.

What's your thoughts?

Good?

94A12039-F7E1-499D-8387-30F6B184BD93.jpeg