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Old 02-26-2002, 10:45 AM   #1
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Default Spark Plugs: NGK vs. Denso vs. Bosch

Let's talk spark plugs. I'm about ready to replace my NGK Platinums and I have been researching plugs the last two days. I have been looking into NGK Platinums, Denso Iridium and Bosch Platinum. I found two very interesing dyno runs comparing the Denso Iridium Race plugs VS Bosch Platinum ( http://www.importreview.com/reviews/densoVSbosch.html ) and Bosch Platiunum VS NGK V-Power ( http://www.importreview.com/reviews/BoschVSNGK.html ). And in both dyno runs on a Honda D16 the standard Bosch Platinum plugs (not Platinum+4) did extremely well.

I ran Bosch Platinum plugs in my previous Honda ('86 CRX Si) and I was very pleased with the performance. The NGK and the Denso plugs run around $14 a plug whereas the standard Bosch Platinums run $2 a plug and the Bosch Platinum+4 run $6 a plug. So I'm kind of leaning towards the Bosch plugs (standard Platinum or Platinum+4).

I would welcome any feedback or information you may have.

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Old 02-26-2002, 10:47 AM   #2
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

Cheap plugs = cheap performance

If your motor is internally stock, then there is no real reason to use any other plug. Granted, if you're boosting of on nitrous, of course..
but Honda designed a particular spark plug to work with a particular engine. They took into account the combustion chamber shape, piston dome or dish, flame travel, etc.

You have a GSR? Get some NGK PFR6G-13 plugs.
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Old 02-26-2002, 10:48 AM   #3
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

I always have problems with bosch plugs.
I stick with NGK.
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Old 02-26-2002, 10:56 AM   #4
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (fuzznuts)

bosch 4227 = BOOTY

they foul way quicker than the NGK's.
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Old 02-26-2002, 10:59 AM   #5
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

NGK - I had a lot of luck with these plugs, until I forgot to change them Click the image to open in full size.
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Old 02-26-2002, 11:05 AM   #6
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

I was in the same boat as you recently... I wanted to try the Bosch Plat +4 but the Bosch reference indicated I should use the +2 in the ITR. I've had them in the car for about a month now and I am very happy. There was a small improvement in the torque feel of the car .. it seems to pull stronger. I did notice a little bit of bad idle when I first installed the plugs but it went away after about 5 minutes of normal driving. I liked these plugs so much that I bought the +4 for my Mazda 323 Click the image to open in full size.
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Old 02-26-2002, 11:06 AM   #7
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (RealTypeR)

Email me about dat NAWWSS kit, yo.

Is it a wet system where I can plumb a jet to each runner on the intake manifold?
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Old 02-26-2002, 11:17 AM   #8
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

Quote:
bosch 4227 = BOOTY

they foul way quicker than the NGK's.
Haha funny but true. Why would you get anything other than NGK??? Click the image to open in full size.
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Old 02-26-2002, 11:32 AM   #9
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

Quote:
Cheap plugs = cheap performance

You have a GSR? Get some NGK PFR6G-13 plugs.
Honda part # 98079-56A7H
Mike, I would generally agree with you comment. But in this instance it is hard to dispute the facts. Now don't get me wrong, I'm not putting down NGK.

I have been running NGKs for 60k miles and I don't have one bad thing to say about them. Actually, my car came with Denso plugs standard (not NGK). I had read a few comments from people that they "felt" that NGK plugs were better than Denso. So at 15k miles, I replaced the Densos with NGKs and I really didn't notice any difference. So now I have almost 75k miles and it about time to replace the plugs. I still have the Denso, so I could replace the worn NGKs with them. Or I could replace the worn NGKs with a new set of NGKs. Or I could give the Bosch Platinums (standard or +4) a try. I still haven't made up my mind. That's why I'm looking for some feedback.

BTW, I did find another good test between NGK and Bosch. It wasn't on a Honda, it's actually was on a Nissan. Here is the link: http://www.se-r.net/engine/bosch_vs_ngk.html
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Old 02-27-2002, 06:45 AM   #10
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

Quote:
You have a GSR? Get some NGK PFR6G-13 plugs.
I noticed that the Type-R uses a different NGK plug (PFR6G-11) than the GS-R. I looked into see what the difference was and found out that the only difference is the plug gap. The PFR6G-13 has a spark gap of 1.3mm (.052") and the PFR6G-11 has a spark gap of 1.1mm (.044"). This made me wonder why there would be a different gap. I was going to ask this question, but I actually found the answer on NGK's website ( http://www.ngksparkplugs.com/techinf.../faqpregap.asp )and I thought that I would share the info. Here is the explanation:

Another consideration that should be taken into account is the extent of any modifications that you may have made to the engine. As an example, when you raise compression or add forced induction (a turbo system, nitrous or supercharger kit) you must reduce the gap (about .004" for every 50 hp you add). However, when you add a high power ignition system (such as those offered by MSD, Crane, Nology) you can open the gap from .002-.005".



One other piece of information that I found interesting was when I was looking up the plug number for my car on Denso's website ( http://www.densoiridium.com/findmypart.asp ). The GS-R and the Type-R use the same plug number (IK-20) for all years. Also for years '94-'99 they use the same plug gap (.044"). But for years '00-'01 the GS-R uses (.050") and the Type-R still uses (.044"). I'm not really sure for this difference.
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Old 02-27-2002, 10:16 AM   #11
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

While we are on the subject of spark plugs, I have heard that copper plugs are better for cars with higher compression. Why is this?
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Old 02-27-2002, 10:33 AM   #12
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (dimsum)

Copper is a better conductor Click the image to open in full size.

NGK BKR7E-11 less than $2.50 each. For my car.

NGK BKR6E-11 for stock compression vehicles. Click the image to open in full size.


[Modified by TodaSi, 2:34 PM 2/27/2002]
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Old 02-27-2002, 10:50 AM   #13
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (TodaSi)

Copper sucks.

Platinum is better. Probably due to the small diam electrode.
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Old 02-27-2002, 11:06 AM   #14
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

Quote:
Cheap plugs = cheap performance
Usally the case, but not here.

Denso, waste of money
Bosch, may be known to produce .5 horsepower and much more heat than NGK - bad...
NGK, always the best ZFR5F-11
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Old 02-27-2002, 11:22 AM   #15
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (w00t!)

Quote:
NGK, always the best ZFR5F-11
Make that a PZFR5F-11. Platinum equivalent to the plug you mentioned.
I run those in my automatic 93 DX coupe. Click the image to open in full size.
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Old 02-27-2002, 12:59 PM   #16
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (w00t!)

Quote:
Bosch, may be known to produce .5 horsepower and much more heat than NGK - bad...
Can you clarify this statement? Are you saying the the Bosch's create more heat? The reason that I ask, is because of this information that I found on NGK's website ( http://www.ngksparkplugs.com/techinf...s/overview.asp ):

It is important to remember that spark plugs do not create heat, they can only remove heat. The spark plug works as a heat exchanger by pulling unwanted thermal energy away from the combustion chamber, and transferring the heat to the engine's cooling system. The heat range is defined as a plug's ability to dissipate heat.
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Old 02-27-2002, 01:30 PM   #17
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

they don't dissipate heat as efficiently as the ngk counterparts..
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Old 02-27-2002, 02:01 PM   #18
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (bojangs)

denso iridiums; need i say more! just be carefull gapping. and yes they do need to be gapped to those who say they dont! look at densos page and see for yourself.
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Old 02-27-2002, 09:09 PM   #19
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (BSQ)

NGK Iriway or Denso Iridium or Spoon Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.

Bosch makes good plugs so I used them on my dads 4runner Click the image to open in full size.
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Old 02-27-2002, 09:15 PM   #20
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (AJ PwR)

i just use the single tip bosch, seems to work fine.
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Old 02-27-2002, 09:38 PM   #21
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (94goldjungsr)

wasn't there quite a few people on this board that highly suggest O.E. plugs for internally stock motors....just wondering

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Old 03-04-2002, 08:06 AM   #22
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (YodaIsGod)

is it worthwhile to put iridium plugs in a motor with ctr cams and pistons?
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Old 03-04-2002, 08:47 AM   #23
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (boroDC2)

Quote:
is it worthwhile to put iridium plugs in a motor with ctr cams and pistons?
Depends. I'd just stick with stock, unless your compression is WAY higher and you have to use a colder plug.
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Old 03-06-2002, 01:13 PM   #24
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (Mike K)

I recommend NGK BKR6E-11 copper plugs for GS-R's, changing them every 10K-15K miles. At under $9 for a set of 4, you can beat it (conducts better than platinum or iridium, only takes 5 minutes to change).
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Old 03-06-2002, 01:27 PM   #25
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Default Re: Spark Plugs: NGK vs. Denso vs. Bosch (PatrickGSR94)

what is the difference between the BKR6E-11's and the BKR6ES-11's ??? anyone know? i just noticed the box i have sitting here are the BKR6ES-11's
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