jw38

I decided to change the plugs and wires on my 2000 Coupe with 18K. I went with the NGK TR55IX iridium plugs and the MSD 8.5mm wires. The job was actually quite easy. The toughest plug to get at was the back plug on the driver's side. Once I removed the hoses and moved the coil packs out of the way, it was a breeze. 10 minutes to do that plug...about 40 minutes to do the rest. What an unbelievable difference it's made!!! The car responds much more quickly, it fires up instantly and idles perfectly!!! By the way, I've heard about the "pucks" falling off of the stock plugs and yes, all eight of the original plugs were missing the pucks!!!

:cheers: :cheers: :cheers:

Richin Chicago

I used the same plugs on my replacement.
I had 3 of the pucks missing, but I would bet it would of been 8 if I left the Delco junk on longer.

Highroller

Where did you buy the plugs and wires and did you get a good deal, also how many miles on the old plugs? :confused:

Crushinator

Wow, all eight pucks were missing! That can definitely make a car not run to it's full potential. Did you get all eight plugs from above or did you have to get under the car?

BostonJoel

Please enlighten me...what are "pucks" on plugs ?????

TedH

Yes, please post pic of the 'pucks'. I haven't touched my C5 (bone stock) and I'm right at 30k miles. Amazed that such an important item can so easily fall off. :eek:

Richin Chicago

It appears that Delco decided to convert a standard plug into a platinum plug and did a very bad job of it. Here is a thread from last Summer that covers the subject fairly well.
http://forums.corvetteforum.com/zerothread?id=391118

jw38

I purchased the plugs at www.clubplug.net and the wires from Shawn at the LAPD. Plugs were about $6.00 each. My old plugs and wires had a little more than 18K on them. It was an easy job, with the exception of the rearmost plug on the driver's side. I just removed the coil packs and the hoses near the plug and I had plenty of room. the other plugs were a breeze! Make sure you use anti-seize on the plugs and dielectric grease on the wires!!! :cheers: :cheers:

brrymnvette

:iagree: I just put on the MSD's with TR-6's last week. It feels like I gained 30hp! I only paid $63 for the wires form Autozone.

wtlytng

This really is exhausting. This was written by a C-forum huy with a great handle on "Ram Air" It's long, and been said before-but one more time for the nose bleed seats

RAM AIR:

Air intakes can be seperated into specific catagories:
- Those that take in warm engine bay air
- Those that are exposed to cooler/fresher air from the front.

The biggest bennefit of adding an aftermarket air intake is unshrouding the factory air box. The last bennefit is exposing it to fresh air. Ram Air is a myth, and many intake manufactures use the word Ram Air strictly for propaganda. They also try to show track results compared to other intakes that simply incur too many variables to make a meaningful and empirical determination. 60 foot times, atmospheric changes, shifting, etc, etc. So do not believe anything you hear regarding such claims regarding air intakes.

Lets take a look at the "Ram Air" Myth in automobiles:
The Ram Air Myth by Dave Rodabaugh:
The Ram Air Myth is the most mythical of them all. It differs from the other myths, in that the other myths are misinterpretations of physical phenomena, whereas ram air simply does not exist. MYTH: Use of a scoop on the front of the vehicle to collect intake air, or provide “ram air” can raise engine performance.
TRUTH: At automobile velocities, there is no ram air effect.
SIMPLE EXPLANATION
The "Truth" statement says it all. How much simpler can it be? The Ram Air effect is a total myth because it simply does not exist. “But Pontiac uses it on the Trans Am, and they know more than you do.” To those who offer this, tsk tsk. Careful reading of Pontiac’s statements on the matter reveal that the HP increase of the WS6 package are a result of a less restrictive intake, and a freer-flowing exhaust, NOT any ram air effect.
So why does Pontiac use Ram Air? Easy! To make people buy their cars! And they are quite effective with this strategy.
DEEPER EXPLANATION
Of all of the applied sciences, fluid mechanics is among the most difficult for many people to comprehend. It is a relatively youthful applied science as well, meaning that it has not had two or three centuries of work to mature into an applied science on par, with say, chemical combustion. To make matters worse, it is mathematically defined almost entirely by experimentally-determined mathematics.
This last point is the true differentiator between those who only understand concepts, and those who can quantify what they are discussing. Truly, quantification is the real skill of the engineer. It is one thing to speak about qualitative issues (the “what” of the physical sciences); it is entirely another to quantify them (the “how much” and “to what extent” of the same). In grade school, students are first taught about “closed form mathematics” and then that these mathematics are typical of scientific expression. A good example of this is Newton’s famed “law of action and reaction”, the mathematical expression of which is a succinct F=MA. So straightforward. So simple. Three variables in perfectly-defined harmony. Given any two of them, the third is easy to nail down.
Unfortunately, a vast, vast majority of the mathematics used in engineering are NOT closed form. Instead, they are multi-variable correlations valid only for a narrow set of circumstances. Deviate from those narrow circumstances, and a new expression must be experimentally derived. Fluid mechanics is almost entirely defined by these experimentally-determined expressions, further muddying an applied science not well understood.
And if there ever were an applied science for which common sense is wholly inappropriate, it is fluid mechanics. Virtually nothing obeys the “common sense” rules of observation, explaining why those who believe in ram air have extreme difficulty in believing that is simply does not exist.
The Deeper Explanation begins with a basic explanation of engine principles. Air and fuel must be combusted at a specific ratio, namely, 14.7 parts air to 1 part fuel (this is a chemical ratio). Stuffing more fuel into the cylinders without increasing the amount of air they also swallow will get no gain whatsoever. So the hot rodder’s adage “more air = more power” is proven correct. Figure out a way to stuff more air into the cylinder at any given RPM and throttle setting, and you can burn more fuel. Since burning fuel is what makes power, more air truly does create more power.
The amount of air which is inducted into a cylinder is a function of the air’s density. As the air flows through the intake tract, it loses pressure, and as the pressure decreases, so does the air’s density. (Denisty is mass divided by volume. Since cylinders are a fixed volume, increasing the density will also increase the mass of the air in the cylinder.) There are two ways to increase the pressure and density of the air inducted into the cylinders:
- Decrease the pressure drop from the throttle plate to the cylinders
- Increase the starting pressure at the throttle plate.
Ram air is an attempt to do the second. Under normal circumstances, the air at the throttle plate is at atmospheric pressure, and this pressure drops until the air reaches the cylinders. Ram air would start the process at some pressure higher than atmospheric, and even though the drop is the same, the cylinder pressure is higher because of the increase at the start.
Just how would this increase in pressure at the throttle plate occur? The oft-wrong “common sense” says, “If a scoop is placed in the airstream flowing around the vehicle, the velocity of the air ‘rams’ the air into the scoop, thus increasing the pressure.”
Why is this incorrect? There are two types of pressure: static and dynamic. Placing of one’s hand in front of a fan, or out of a moving car’s window, clearly exerts a force on the hand as the air diverts its path to flow around it. Most people would say “See? This is a clear indication that ram air works. Clearly there is pressure from the velocity of the air.” Well, this is correct, but only to a point. This is an example of dynamic pressure, or the force any moving fluid exerts upon obstacles in its path as the gas is diverted around the obstacle.
What an engine needs is static pressure. This is the pressure the same fluid exerts on any vessel containing it at rest. For those who were physics/chemistry geeks, it is the pressure caused by the force of the molecules bouncing off of the walls of the container. The key to understanding the difference between static and dynamic pressure lies in the velocity of the gas. Dynamic pressure is only a momentum effect due to the bulk motion of the fluid around an obstacle. Static pressure is an intrinsic property of a gas or fluid just because the molecules of the fluid are moving around. Any fluid which is moving can have BOTH dynamic and static pressure, but a fluid at rest only has static pressure.
The point of ram air would be to increase the static pressure, which would correspond to an increase in the in-cylinder air density, and of course, more air. Superchargers and turbochargers do what the mythical ram air purports to do. A supercharger trades the power of the belt and uses it to compress the air in the intake tract. This energy trade-off results in an increase in intake air pressure, more air in the cylinders, more fuel burned, and more power. A turbocharger trades the power of the hot gases and uses it to compress the air in the intake. The overall effect is the same – an increase in intake static pressure.
For ram air to work, it would have to trade the energy of the air’s velocity (as the vehicle moves through the air) for an increase in static pressure (since static pressure is a part of a gas’s internal energy, we see this is TRULY a trade in kinetic energy for an increase in internal energy). Now for the true reasons why ram air is a myth:
- The way for air velocity to be traded for an increase in static pressure is to actually SLOW IT DOWN in a nozzle of some sort. This is easily the MOST counterintuitive part of fluid mechanics for most people. The “common sense” mind says “In order to increase the pressure of the intake, the velocity of the air needs to be increased, just as increasing the speed of a fan exerts more force upon the hand.” Not only does this confuse dynamic with static pressure, but is also misses the point, which is to trade the kinetic energy of the gas for an increase in internal energy. How can this trade occur if the kinetic energy of the gas is increased? It cannot, and in fact, the only way to trade it is to use the velocity of the gas to compress itself – by slowing it down.
- Below about Mach 0.5 (or about half the speed of sound), air is considered “incompressible”. That is, even if the correct nozzle is selected, and the air is slowed down (the official term is “stagnated”) there will be zero trade. No kinetic energy will be traded in as work capable of compressing the air. The reasons for this are not discussed here; the reader may consult any reputable fluid mechanics textbook for confirmation of this fact. In plain English, a car is just too slow for ram air to work.
Still not enough evidence? Here is a little test. For ram air to work, the nozzle must be of a specific shape. The “Holley Scoop” for the Fiero is the wrong shape, by the way. The fact that it has no net shape at all immediately means it cannot effect any kind of energy trade off, so it cannot possibly create ram air. This is also true for the hood scoops on the Pontiac Firebird WS6 package as well, by the way.
What shape must it be? There are two kinds of nozzles. Pick one:
- Converging. This nozzle gets smaller as the air flows through it. It has a smaller exit than entrance. If the nozzle were a cone, the fat end is where the air would enter, and the narrow end is where it would exit.
- Diverging. This nozzle is opposite the other; it gets bigger as the air flows through it. With a larger exit than entrance, the narrow end of the cone is where the air would enter, and the fat end is where it would exit.
So, which is it?
Without hesitation, most of the “common sense” crowd will answer “Converging.” BZZZZT! Thank you for playing anyway! We have some lovely parting gifts for you! Bill, tell ‘em what they’ve won….
The answer is “divergent”. Yes, the nozzle would have to shaped so that the skinny end is pointed into the air stream, and the fat end connects to the throttle plate. How can this be right? Remember, to increase the static pressure of the intake air (which is the true “ram air” effect), the kinetic energy of the air must be traded to compress the air. This is done by slowing the air down, or stagnating it, and the only way to do this is with a diverging nozzle. Ah, but since air is incompressible at automobile speeds, it doesn’t matter any way.
Conclusion
Ok, now you guys have me cranked up!
I have a new set of TR55s and Thunder Volt 10.5 wires sitting on the shelf in the garage right now, so I’m going to run down there and install them.
Thanks for the push.
Flash. :seeya

wtlytng

Don't know what happend there!
Sorry bout that.

Ok, now you guys have me cranked up!
I have a new set of TR55s and Thunder Volt 10.5 wires sitting on the shelf in the garage right now so I’m going to run down there and install them.
Thanks for the push.
Flash.

FunDriver

I replaced mine at 35K miles with the TR55's and yes, the car ran a little smoother but not a lot. I had 5 pucks missing. (For the person above wondering what they are, they are like little hockey pucks on the curved part of the spark plug where it fires.) The infamous driver's side plug was definitely the hardest to replace but with taking the coil packs off it wasn't too bad.

But in my case, even with the pucks missing, the car wasn't running badly. And by getting new plugs, I certainly didn't feel that I gained any horsepower...maybe just a slightly smoother-running engine. Also, the plugs all looked good too, so if I hadn't been worrying about the pucks, etc. I could, and probably would, have just kept the stock plugs until the idle or running of the engine finally became noticeable. l'm not saying that the iridium plugs might not have helped, just that new ones for me didn't do a lot.

Richin Chicago

Mine showed up in a slightly rougher idle but where it really showed up is in a long 3rd gear wide open throttle pull on a roadcourse. It would start having a slight miss around 4800 RPM. (3 pucks gone)

Mean Green

:confused: how did we get from spark plugs to ram air :confused:

i_york

What really worries me is what happens to the pucks?? Are they rattling around in the combustion chamber and scratching-up the cylinder wall?! :eek:

Richin Chicago

As you probabally know these pucks are very tiny. My guess is they blow right out the exhaust port.

MTWallet

Here is a picture of a NGK-TR55 plug (left) and a Original Delco Platinum plug (right). Notice the small platinum tip (puck) on the outer electrode of the Delco plug. This is what comes off and is most definitely passed through the exhaust.

ROCKnROLL

what is the recommended gap setting for the NGK-TR55 plugs?
is it different from the ACDelco platinum or the same?
thanks

MagRedSkull

NGK TR55s - gap them at 0.050

RichMisner

That's an excellent write-up! Now, in the perfect world, someone would add spark plug & wire change-out procedures to the C5 Tech Tip section, along with product & installation pictures, and brand/model product info for plugs, wires, el.gel, & anti-sieze!

:cheers: