spark plug for 55-K engines
Thread Starter
MBWorld Fanatic!
Joined: May 2008
Posts: 1,615
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From: Maryland
SL55 AMG
spark plug for 55-K engines
What are the optimal performance spark plugs for this engine (reliable, improves performance, long lasting, for street but also for several drag days per year)? Anyone have any advice? The factory uses bosch I'd think...
However NGK is said to make a great product...if so which p/n? and how does this change (colder or hotter) if say the car is modded (pulley, TB, headers/exhaust etc...etc...) would you benefit from a different spark pug choice?
I recently heard about the E3 Diamond Fire spark plug which is supposed to fire in the middle of a 3 pronged ground strap instead of a conventional sparg plug...anybody tried these or have any information on how these would work for our engines...I've found mixed reviews on these from the web...on other forums.
On a forced induction S/C engine seems like there is some controversy on what plugs to run, in terms of brand, temp, gap etc...just trying to see what advice some of you guys have from your experience...especially considering 55-K with mods..thanks
However NGK is said to make a great product...if so which p/n? and how does this change (colder or hotter) if say the car is modded (pulley, TB, headers/exhaust etc...etc...) would you benefit from a different spark pug choice?
I recently heard about the E3 Diamond Fire spark plug which is supposed to fire in the middle of a 3 pronged ground strap instead of a conventional sparg plug...anybody tried these or have any information on how these would work for our engines...I've found mixed reviews on these from the web...on other forums.
On a forced induction S/C engine seems like there is some controversy on what plugs to run, in terms of brand, temp, gap etc...just trying to see what advice some of you guys have from your experience...especially considering 55-K with mods..thanks
Super Member
Joined: Aug 2003
Posts: 626
Likes: 3
From: Los Angeles, CA
'03 E55 (My Daily), '01 ML 320 (Wifey), Twin Turbo '69 Camaro (In Progess)
I just changed out my plugs. I went with the OEM originals which are NGK ILF6RA. Don't bother with that gimmicky E3 stuff. This supercharged engine won't respond well to the triple electrodes.
MBWorld Fanatic!
Joined: Jun 2007
Posts: 1,378
Likes: 4
From: Bloomingdale,IL
2004 W211 E55K, GL550
i don't belive in aftermarket "high performance spark plugs" O.E is the best way to go for any make or model in my oppinion.
MBWorld Fanatic!
Joined: Oct 2009
Posts: 2,825
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From: Southern California
E55 w/ goods, Z32 Project underway
I ran those PulseStar plugs in my RL and the tip broke off in my cylinder! Have pictures. Will only run proven plugs with the combustion chamber this AMG has.
Super Member
Joined: Apr 2009
Posts: 552
Likes: 11
From: Chicago suburbs
2004 E55 AMG
I used to work with the guy who did spark plug testing for a company that makes platinum plugs with multiple electrodes(you figure out the company). We used to always joke about how the marketing department had done a great job convincing the public that more electrodes = better spark/power/economy. It's all marketing, and if there is a difference you'll never be able to document it, it's so insignificant.
Buy the NGK ILFR6A's(Part # 3588 I believe). Do not buy anything off of e-bay or out of a store's catalog that claims to be the correct plug. Every document that I saw at all of the major parts retailers has the wrong plug listed. The correct plug is approximately 1 inch long, and the rest are 1/4" shorter, so they don't extend into the combustion chamber and actually sit up in the spark plug hole.
