iridium vs. Bosch Platinum +4 plugs

[laidback22]

Has anyone put these to the test?

I use th Bosch +4's in my other vehicles (V6 & V8) but I have no exp. with the iridiums.

I have a 90 Si and I planed on only adding bolt-ons (ie.,header,intake,plugs,wires)

If you have exp. the question is Denso or NGK....
Thanks

[Veetec]

Doesn´t matter! Both (Denso and NGK plugs) are well for our Hondas!!

[car_boy_16]

I have bosch plat +4s...I was ignorant when I bought them for 6 dollars (I believe) each!! To tell you the honest to god truth, the design of the plugs are just a marketing scheme. The 4 tips doesn't allow better spark or better ignition, it's just a design. Just get some NGK plugs, they are better.

[ludetuner]

Ngk plugs are factory fit on many imports

[integra111]

spark plugs are all the same, wires are what makes the difference

[Veetec]

Originally Posted by integra111

spark plugs are all the same, wires are what makes the difference

What difference?

[Privatebigandrew]

actually, not all spark plugs are the same....Put a pair of autolites in your honda and come tell me there isn't a difference. Wires with lower resistance per foot allow more voltage to reach the plug. This produces a more powerful spark for a more complete burn. The Bosch platinum4's are a marketing scheme; in a way. Electricity always takes the path of least resistance, therefore, the spark will only travel to one electrode (the one with least resistance). This does allow for a better spark because it can find the easist path each time, but its not worth the difference in price. Let bosch stick with the german cars, Ngk with the Asains, and autolite with domestics.

[Veetec]

Originally Posted by Privatebigandrew

actually, not all spark plugs are the same....Put a pair of autolites in your honda and come tell me there isn't a difference. Wires with lower resistance per foot allow more voltage to reach the plug. This produces a more powerful spark for a more complete burn. The Bosch platinum4's are a marketing scheme; in a way. Electricity always takes the path of least resistance, therefore, the spark will only travel to one electrode (the one with least resistance). This does allow for a better spark because it can find the easist path each time, but its not worth the difference in price. Let bosch stick with the german cars, Ngk with the Asains, and autolite with domestics.

Apex'i Drag Integra with clockwise rotating H22A and twin turbo setup
with a stock H22A ignition system. http://asia.vtec.net/beystock/hybrid/art2/
(Thanx to drift for the info and link!)

Stock ignition system is already well designed....

[Holyterror]

I haven't played with the iridium plugs yet, but I trust NGK in general, so they'd be my first choice. As the others have said, the Bosch +4 plugs are 100% gimmick. There may be one theoretical advantage: if the best electrode (the path of least resistance) wears down or becomes sooty, then the current will just find its way over to another plug. In practice, the plug will probably be near the end of its useful life before this happens anyway, and most of the usual things that foul plugs should foul all four electrodes at the same time. In any case, they're not worth the ridiculous price.

Anybody feel free to correct me if I said something that just doesn't make sense.

[portaman03]

Privatebigandrew is right. unless you have a high power ignition system or some nology hotwires, the spark rarely, and i mean RARELY meaning almost never, reaches more than one prong on the tip of the plug. if you are lucky it MIGHT spark on two of them, but then again, if its only sparking on two, whats the point of four? gimmick. i have denso iridiums. great plug.

[laidback22]

Thanks for the replies

I am going to do a tune up on this car as I just bought it and have no idea how old the current components are. I think I'll go with the irridium plugs, new wires, air filter for now until i figure which intake to put on.

[portaman03]

good idea

[pikkagtr]

MGK IX stick with these for hondas
i dunno about denso, asking a litlle too much, seems to be the same plug to me IMO

[BullShifter]

http://www.importreview.com/reviews/BoschVSNGK.html
http://www.importreview.com/reviews/densoVSbosch.html
Dyno tests

[B16AB16BB18CK20A]

Originally Posted by jackasssi

http://www.importreview.com/reviews/BoschVSNGK.html
http://www.importreview.com/reviews/densoVSbosch.html
Dyno tests

these dynos are misleading...they compare a bosch platinum plug with a copper ngk plug as opposed to a plat vs plat comparison. the platinum plug should show better dynos, and it does however slightly. even thought the test was to prove that the bosch plat plug was a better power producing plug, it also shows that the ngk copper is just about as good!