SPARK PLUG GAP

[demarconstruction]

HELLO CAN ANYONE TELL ME THE GAP SPECS FOR A Denso Iridium Spark Plug FOR A PORSCHE CAYENNE TURBO 2004. tHANKS DEAN

[Loren]

1.6 mm

[ventuje]

HELLO CAN ANYONE TELL ME THE GAP SPECS FOR A Denso Iridium Spark Plug FOR A PORSCHE CAYENNE TURBO 2004. tHANKS DEAN

DId you put the Denso's in your Cayenne? What was the part # and how is it running?

[Gerlewis]

How about the 4.5 cayenne s? Does anyone know the gap for those plugs? I've seen some on ebay and they say 'gap: 1' but I don't trust the listing as I cannot find confirmation online.

Thanks in advance

[Loren]

How about the 4.5 cayenne s? Does anyone know the gap for those plugs? I've seen some on ebay and they say 'gap: 1' but I don't trust the listing as I cannot find confirmation online.

Thanks in advance

:welcome:

The V8 engine gets the same spark plug gap in both the normally aspirated and turbo versions - 1.6 mm.

[Gerlewis]

Thanks ! :thumbup:

[Gerlewis]

Me again!

Im looking to buy a torque wrench, and am trying to decide between 1/2 inch drive and 3/8 inch drive.

Which would be the most handy tool to own? And suitable for the coils/spark plugs? (I assume if 1/2 inch is too large I can get a stepper adapter?)

Thanks,

Ger

[Loren]

Either will work with proper calibration. You need to be careful with adapters as they can change the "actual torque" - so I suggest get the one that fits your sockets.

[mbagge01]

Do the OEM spark plugs come correctly gapped for a 2004 cayenne turbo. I am getting some surging (my car does have an EVOM tune) but I came across someone mentioning that the spark plugs need to have the gaps adjusted?

[hahnmgh63]

Some Turbo engines with the Boost raised will do better with the Spark plug gap slightly reduced as the higher pressures can quench the spark. Do a Google search and you can see what the consensus is.

[Gerlewis]

I fitted Densos this weekend, its running fine.

But I did read on cheaper plugs the gap can increase by 0.01mm every 5000kms-10000kms, so I gapped mine at 1.5mm to allow for some wear. Its running fine atm.

[mbagge01]

My new OEM spark plugs have 4 prongs. I have read that the gap cannot be changed on spark plugs with multiple prongs.

[Gerlewis]

How big is the gap on the oem plugs?

[Loren]

How big is the gap on the oem plugs?

See response #2 -- 1.6 mm

[mbagge01]

I have not measured them because I was under the assumption that they can properly pregapped as I have read that multi prong spark plugs cannot be changed. They are Beru.

[Gerlewis]

How big is the gap on the oem plugs?

See response #2 -- 1.6 mm

Is the gap to be measured from the prong tip to the central column, or from the prong tip to the central 'tip'? (the reason I ask is the elongated tip is further away than the central column, so I doubt sparks would bridge further than they have to.

See pic as an example:

[Loren]

You do not gap 2 or 4 prong plugs - they come pre-gapped. Only a problems are if you drop them on a hard surface - but in that case you might have cracked the ceramic too.

Just put them in and torque them properly and you are done.

[mbagge01]

I have come across a couple posts with people having similar problems as me and have went with NGk iridium Ix spark plugs which come with a gap of .32 but changed it to .25 and have great results on chipped cayennes. I am going with that option to see if it fixes my surging issue.

[Gerlewis]

Ive measured the gaps on my old Bosch R5: fgr6kqe plugs

from tip of prong to central tip:2.1mm (0.85") ILLUSTRATED IN GREEN

from tip of prong to shorter thicker central column: 0.5mm (0.02") ILLUSTRATED IN RED

Excuse the terrible image quality - don't ever buy a blackberry!

I'm not sure what this tell us though…

Uploaded with ImageShack.us

Edited September 15, 2012 by Gerlewis

[Gerlewis]

This image gives a better idea:

Does anyone know why they are designed with a bit of white meterial obstrutcing the gap? also why the gap measures over 2mm (on mine at

least)?

Uploaded with ImageShack.us

[RFM]

The spark slide during its way between the tip and the nearest side electrode partially across the insulator to keep the nose clean from combustion dirt. This type of spark plug is also called "sliding spark plug" over here.

[mbagge01]

Well, I ended up changing out all my spark plugs and putting in NGK iridium IX, along with making the gap smaller and all my problems went away. It appears that the OEM plugs do not work well with ECU tunes.

[mbagge01]

Unfortunately I will like to add that my pinging problems are coming back after 2 days of improved driving. After starting the car the first run seems fine but when the engine warms up it gets worse. Should I try one heat range colder plug as I have read that is recommended with a tune.

[wvicary]

The spark actually travels onto the white ceramic then to the ground electrode. It's said to keep the plug cleaner with less chance of fouling.

[Gerlewis]

The spark actually travels onto the white ceramic then to the ground electrode. It's said to keep the plug cleaner with less chance of fouling.

Well in that case, on my OEM plugs, the gap measures 2.1mm (0.085"). Can anyone explain that if the gap is recommended by porsche to me 1.6mm?

As a thought- could this be the reason people are getting cracked plugs, due to the electric trying to find a place to go and findinfg it easier to go through to the engine block rather than to bridge the plug gap?

Ger