Are the Bosch Platinum +4 plugs good for my vette or should I go with something else? What should I gap them too? Thanks...... :cheers:

 

.05 gap

 

Are these plugs good or should I use NGK's?
:cheers:

 

I am now using NGK's. Really like them. Car runs smoother. I have mine gapped at .40 but am running nitrous.

 

I tried a set of Plus 4's in my old car, a 91 cutlass, and it ran just about like crap. A set of trusty plain old AC delco's and it ran just fine again. I then paid attention to how cheap the plus 4's looked.

I used NGK's in my vette on the recommendation of a friend, when they got here I was not disappointed, they are VERY good looking plugs and seem to do their job well. Get some NGK's for a max of $16 and you won't be let down.

 

I've been running the Bosch Platinum +4's for two years. They perform very well and I recently pulled one and it still looks brand new after 5,000 miles. Also, you don't gap them, they come pre-gapped. Just my $.02.


[Modified by CG77VETTE, 3:37 PM 11/1/2001]

 

I am running ngk tr55 from the delco and what a change car is smoooooth as silk !!!!!!!! :jester

 

ok...I'm getting the NGK TR55's. Should I get the NGK TR55 IX's? Here is the difference:

NGK TR55:
About the V-Power.

Modern lean-burning, fuel efficient engines create a new set of requirements for spark plugs. NGK Spark Plugs answered the call for a spark plug with lower sparking voltage requirements by developing the V-Power, the only spark plug with a v-groove electrode on the market today. Why is this important? The v-groove center electrode on a V-Power spark plug forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture. What this does is allow the spark to more quickly ignite the mixture, providing more complete combustion.

More complete combustion not only provides more power, it also means less harmful emissions. These emissions are not only damaging to the environment, they can reduce the life of expensive catalytic converters and oxygen sensors. V-Power Spark Plugs also require lower ignition firing voltage, resulting in quicker starts and easier cold weather starts throughout the life of the plugs.

Here are some of the features of this plug:


Triple-Gasket Sealing Process
Virtually eliminates the possibility of combustion gas leakage through the shell. Most other manufacturers only use two seals.
Solid-Copper Core
Produces a more powerful spark with less firing voltage. Other manufacturers use a "copper coated" center core.
V-Groove
Forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture. This allows the spark to more quickly ignite the mixture, providing more complete combustion.
Cold-Rolled Threads
For easier removal and installation.
Corrosion Resistant
Zinc Chromate Coating Double-dipped for maximum protection. An NGK exclusive.
Alumina Silicate Insulator
Is virtually pure to insure dielectric and physical strength, as well as heat transfer away from the tip for maximum performance.
Corrugated Ribs
Eliminate "flashover", which can cause misfiring and engine damage, especially in damp environments.

NGK TR55 IX:
About the Iridium IX.

It may be time to invest in precious metal futures. NGK Iridium Spark Plugs represent the ultimate evolution of spark plug technology and performance. Iridium allows for a center electrode 75 percent the size of a platinum electrode and 24 percent the size of a conventional nickel electrode.

The fine electrode tip is engineered for greater ignitability. And it's in the design of the iridium tip that makes Iridium IX a better spark plug. The electrode is not too thin and not too thick. It's just the right size to reduce the voltage required for spark and to maximize the overall longer life qualities of iridium.The result are spark plugs that require less voltage to spark, burns fuel more efficiently, sparks at leaner air/fuel mixtures, and delivers higher horsepower and better gas mileage. NGK's new Iridium IX is the personification of these qualities and takes premium performance spark plugs to a new level. A level that is expected from the world leader in spark plugs.

There are two advantages of the TR-55IX. Longevity and gapping. According to NGK, the Iridium IX should last longer than the V-Power Tr-55 and you'll also be able to open the gap up for better performance. We recommend gapping the Iridium IX plugs at .060 as a baseline for your modified engine and tuning from there for your specific car. They should be pre-gapped from the factory at this gap. Be extremely careful when gapping the plugs due to the Iridium center electrode.

What do you think?
:cheers:

 

I've been told that the platnum plugs will pass emmissions for a long time - well past the time that they are producing optimum performance.

Conventional wisedom seems to indicate changing at 20-25,000 miles for best performance.

Don't know if it's true, don't really care. I'm comfortable with copper plugs changing them myself every 20,000 miles. If I had to pay a dealer to change them, I might rethink the situation.

 

Another vote for the NGK TR 55's! :yesnod:

 

very happy with my +4's

 

Strange, I just use the plain TR55 V-powers. I can't speak for how long they last, but I'm going to see how they've been doing when I put on my headers. Also when I get my headers it won't be a 10 hour job to change plugs, so if these look good, I'll probably just make up some service interval and change my plugs on that schedule, like 20-30 thousand regardless.

It's a PITA to change plugs with manifolds, so you might want to look into something that will last a while.

 

Go with the NGK TR55. I have had them in three different vettes. A whole set for about $12. They can't be beat.