spark plug gap

[06z4m]

can someone tell me the correct spark plug gap. cant seem to find it. should normally pre gapped but i always like to check.

thanks :driving:

 

[Smartbear]

Our mini plugs I just changed were 1mm, I think the z4 ones are the same.
Regards

 

[Argenta]

On my Iridiums I was told 0.9mm and it runs very sweet if that says anything.

 

[Adam D]

If using an iridium plug they are pre gapped and not usual to change them. I found the denso iridium power plugs worked well

 

[06z4m]

thanks guys

 

[Beedub]

i gapped mine.... 2 of them were incorrect, i can dig out what they were gapped too if you want, i recorded it on my service book. Always good practice to check.

 

[06z4m]

i gapped mine.... 2 of them were incorrect, i can dig out what they were gapped too if you want, i recorded it on my service book. Always good practice to check.

thats why i always check. thanks

for anyone interested i have the bmw plugs. part # 27772 bmw box. ngk plug #dcpr8ekp dual elctrode type. gap on the side elctrodes is .018" or .4572 mm for you metric guys :driving:

 

[Argenta]

If using an iridium plug they are pre gapped and not usual to change them. I found the denso iridium power plugs worked well

Well worth a check tho as they easily get out of tolerance with slightest bump.

 

[GreyZed]

I thought you were not meant to adjust iridiums as the latest technology very small diameter iridium alloy electrode is too easily damaged by the very old tech feeler gauges we all know and love?

 

[no fit state]

What's the socket size for the plugs? I want to give mine the once over during the holiday period.

Cheers.

 

[GreyZed]

Found this regarding gapping iridiums...

http://www.ngkntk.co.uk/index.php/technical-centre/spark-plugs/spark-plug-gap/

On socket size I'm guessing at 14mm but I don't have an M (my socket set has a variety of thin walled plug sockets with the rubber inserts so I just try them until I find the one that fits). Best to use a special thin walled one with the long reach and rubber grab insert rather than a bog standard socket.

 

[Argenta]

Of course the hamfisted should probably think twice about adjusting the Iridiums, however - they are not specified for our engine officially, which means they don't come with our trusted 0.9mm gap.
They are perfectly adjustable if you take a bit of care.

 

[Beedub]

socket size is 12mm they are small and thing so be very careful with removal and re -torquing.

 

[06z4m]

I thought you were not meant to adjust iridiums as the latest technology very small diameter iridium alloy electrode is too easily damaged by the very old tech feeler gauges we all know and love?

you can with a small pair of needle nose pliers etc just dont pry on the center electrode. i have had to do it because of some coming with the wrong gap.

outside hex is a 5/8". thread sizes is 12mm.

the ones i got are not fine wire but double platnuims dual electrode. came in a bmw box so guessing they are the oe type plug

 

[no fit state]

There's a bit of a difference between 5/8 and 12mm.

 

[06z4m]

There's a bit of a difference between 5/8 and 12mm.

outside hex is 5/8" head to remove plug so need a 5/8 socket to remove/install thread size on the plug is 12mmhttp://www.ngksparkplugs.com/products/spark-plugs

 

[no fit state]

There's a bit of a difference between 5/8 and 12mm.

outside hex is 5/8" head to remove plug so need a 5/8 socket to remove/install thread size on the plug is 12mmhttp://www.ngksparkplugs.com/products/spark-plugs

Cheers

 

[exdos]

Personally, I'd never adjust the gap on the spark plugs in the S54 engine, I know of 2 cases of these spark plugs breaking losing the parts inside the cylinders even though they had never been adjusted (i.e. metal parts not been bent). One of these incidents happened to a friend I was driving with en route to The Ring, and he had to drive the last 100miles on 5 cylinders. Fortunately, a scope showed that the metal bit had been blown out of the cylinder with no damage, but it could've been different.

 

[Beedub]

Personally, I'd never adjust the gap on the spark plugs in the S54 engine, I know of 2 cases of these spark plugs breaking losing the parts inside the cylinders even though they had never been adjusted (i.e. metal parts not been bent). One of these incidents happened to a friend I was driving with en route to The Ring, and he had to drive the last 100miles on 5 cylinders. Fortunately, a scope showed that the metal bit had been blown out of the cylinder with no damage, but it could've been different.

i hear you but couldn't that happen on any engine??

 

[06z4m]

Personally, I'd never adjust the gap on the spark plugs in the S54 engine, I know of 2 cases of these spark plugs breaking losing the parts inside the cylinders even though they had never been adjusted (i.e. metal parts not been bent). One of these incidents happened to a friend I was driving with en route to The Ring, and he had to drive the last 100miles on 5 cylinders. Fortunately, a scope showed that the metal bit had been blown out of the cylinder with no damage, but it could've been different.

i hear you but couldn't that happen on any engine??

with anything mass produced there will be x amount of bad ones git through. but it would suck to have a spark plug faliure like that.
i once pulled a ngk laser cut iridium out of a aprilia that was running poorly. it unscrewed but just the center came out! threads still in head.
plug was never gapped.
cheers :driving: