One Step Colder Spark Plugs

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Oct 17, 2007 | 07:23 PM

phatmitzu

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From: Los Angeles, CA

2005 E55

One Step Colder Spark Plugs

This thread got me thinking of getting colder plugs.
https://mbworld.org/forums/w211-amg/214432-reducing-engine-heat.html

I had them on two of my previous turbocharged vehicles and they worked well.

Thoughts??

Oct 17, 2007 | 09:37 PM

BrianS

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From: Maryland

2004 E55 AMG

Me too. On my previous turbo car I had to go two steps colder. I went from an NGK 6 to an 8 but I was tuned for 26psi boost too.

What are the stock plugs?

Oct 17, 2007 | 09:43 PM

rflow306

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From: Mia

2005 E 55

The stock plugs are NGK ILFR6A, I changed to NGK Iridium LFR7AIX. Mercs use very hot plugs to begin with.

Oct 17, 2007 | 10:07 PM

chiromikey

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'03 E55, Range Rover Sport Supercharged, Ducati 748R

Quote:

Originally Posted by rflow306

The stock plugs are NGK ILFR6A, I changed to NGK Iridium LFR7AIX. Mercs use very hot plugs to begin with.

was n2o behind you switching to a colder plug or was there anther reason?

Oct 17, 2007 | 10:39 PM

Jrocket

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From: So.Ca.

E55

Quote:

Originally Posted by rflow306

The stock plugs are NGK ILFR6A, I changed to NGK Iridium LFR7AIX. Mercs use very hot plugs to begin with.

But you needed to go from a 6 to a 7...to help out with that 500 shot your running..

Oct 17, 2007 | 11:13 PM

BrianS

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Joined: Apr 2007

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From: Maryland

2004 E55 AMG

Quote:

Originally Posted by rflow306

The stock plugs are NGK ILFR6A, I changed to NGK Iridium LFR7AIX. Mercs use very hot plugs to begin with.

What gap are you using?

Oct 17, 2007 | 11:34 PM

rflow306

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From: Mia

2005 E 55

Quote:

Originally Posted by BrianS

What gap are you using?

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Oct 18, 2007 | 09:03 AM

stevebez

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From: London, UK

No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo

What is the next colder plug equivalent for the OEM plugs ???

Also how does the dual sparkplug thing come into it ? Why dual to start with ?

Oct 18, 2007 | 09:13 AM

#10

stevebez

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From: London, UK

No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo

Quote:

Originally Posted by Zod

forgive me on this but could some one please explain how spark plugs been cold helps

When the spark plug shorts / sparks the electrode gets very hot. How hot this electrode stays is what is meant by a hot v cold plug. A cold plug will dissapate its heat from the electrode into the head very quickly. What is perhaps more important is when a plug runs too hot than what its designed for because of higher boost, leaner mixture etc... will wear much faster and in itself possibly promote knocking as the electrode remains too hot for the conditions in the cylinder.

There is greater chance of detonation and wear on a hot plug under higher cylinder temps than for which it was designed. A cooler plug is almost always safer ... but you cannot go too cold or the sparkplug will start fouling up, and the spark will degrade....

So typically if you add decent power to your motor via mods its safer to go with a one step cooler plug than OEM

This is how I understand it ...

Oct 18, 2007 | 02:02 PM

#11

phatmitzu

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Some info from the NGK website

http://www.ngksparkplugs.com/techinf...000&country=US

Oct 18, 2007 | 02:24 PM

#12

Ghostrider

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From: KCMO, but Houston is my home.

01 CLK 430

Quote:

Originally Posted by stevebez

So typically if you add decent power to your motor via mods its safer to go with a one step cooler plug than OEM

This is how I understand it ...

Would this be the same thinking for a N/A motor???

Oct 19, 2007 | 03:13 AM

#13

stevebez

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From: London, UK

No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo

Nice idea these Iridiums that Albert uses ... not a cheap sport though when you need 16 of these puppies ...!

Oct 19, 2007 | 08:45 AM

#14

rflow306

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From: Mia

2005 E 55

Quote:

Originally Posted by stevebez

Nice idea these Iridiums that Albert uses ... not a cheap sport though when you need 16 of these puppies ...!

Changing them is a lot of fun also. lol

Oct 19, 2007 | 08:47 AM

#15

rflow306

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From: Mia

2005 E 55

Quote:

Originally Posted by Jrocket

But you needed to go from a 6 to a 7...to help out with that 500 shot your running..

Dam.... I can't tell you anything.

Oct 19, 2007 | 03:37 PM

#16

AdamG@NorCal

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From: Fremont, Ca

EVOTECH Mercedes AMG

Quote:

Originally Posted by rflow306

Changing them is a lot of fun also. lol

Oh yeah...

Oct 19, 2007 | 04:46 PM

#17

waxking1

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CL65

Quote:

Originally Posted by rflow306

The stock plugs are NGK ILFR6A, I changed to NGK Iridium LFR7AIX. Mercs use very hot plugs to begin with.

I checked and these plugs are $30 plus each, although there are some on ebay quite a bit cheaper. Can you tell any difference in performance?

Oct 22, 2007 | 09:26 PM

#18

phatmitzu

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2005 E55

No one else except rflow306 uses colder plugs?

Oct 22, 2007 | 09:43 PM

#19

Jrocket

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E55

Quote:

Originally Posted by phatmitzu

No one else except rflow306 uses colder plugs?

Theres no need,Rflow uses them due to the Nitrous unit.

Oct 23, 2007 | 12:18 AM

#20

phatmitzu

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I see. Thanks.

Oct 23, 2007 | 01:38 AM

#21

Zod

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From: Kuwait

CLS55 2006, CLS 63S 2015

so with pulley, header , tb and ecu done... there is no need to play with plugs?
are they only meant to be changed with nos?
or a specific hp reached?