First of all I am going to say I like the idea of a very low ohm spark plug wire which is why I bought the Granatelli wires.
I have a 2003 Neon SRT-4 and have bought a set of Granatelli wires part no. 24-1283S 90 degree bend at the coil, they snapped on to the factory coil just fine but I could not get them to snap on to the spark plugs no matter how hard I pushed them down they never snapped on or felt tight. I thought well maybe they are on but different some how so I went for a short drive.
The car ran OK for about 3/4 mile then I got mis firing and backfiring. I went back home and put the stock ones on. The stock ones snapped right on to the spark plugs nice and tight easy as that.
The rubber boots that go down into the valve cover to the spark plugs are the same length as the stock ones (5.3 inches) BUT the metal connector inside of the boot on the Granatelli's is recessed 1/4 inch higher in the boot than the stock wires. This explains why there is not a secure connection with the Granatelli wires.
I was sent another set of Granatelli wires part no. 24-1749S straight connector at the coil, set of wires had the same problem, the metal connector to the spark plug is recessed too far in the boot by a 1/4 inch. This stopped it from snapping on to the boot.
Has any one else had this problem?
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Silver SRT-4 bought 2-25-03 without front plate. My car is so stock. Yes sirey Bob
Last edited by SRT-4_2-25-03 : 02-13-2008 at 06:00 AM.
A low resistance (measure in ohms) is nice if you're making a conductor for a high current application since resistance is the opposition to current flow. But that's not as important as one might think on the secondary high side of an ignition system. The internal windings on the coil step up the input voltage from ~12-13.7 volts to north of 40,000 volts but that also means current has to drop from an amp or two down into the milliamp region or less. In simple terms you can think of current as the overall amount of electrons flowing and voltage as the pressure or force pushing those electrons. Since the coil steps up the voltage so high (which has an inverse effect on output current from the coil) there is a ton of force (voltage) but not a lot of electrons (current) to push. And a resistance of double digit ohms to a few thousand ohms isn't going to make any noticeable difference to 40k volts pushing that current through the conductor. A much more important gauge of a wire is the quality of the conductor itself and how it will age as well as the insulation material and the design of the boot/connectors.
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Eric H.
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Last edited by blackbird_R/T : 01-19-2008 at 02:47 AM.
Reason: speeeling und gramore errore
" Here we have the Granatelli wires. These wires were the lowest wire OHM resistance wire we have ever tested, at 2 ohms of resistance. Granatelli uses a stainless steel core, wrapped in silver plated copper wiring. This is the highest quality wire we have ever carried, and the wire that we strongly recommend."
My next set this summer!
A low resistance (measure in ohms) is nice if you're making a conductor for a high current application since resistance is the opposition to current flow. But that's not as important as one might think on the high secondary side of an ignition system. The internal windings on the coil step up the input voltage from ~12-13.7 volts to north of 40,000 volts but that also means current has to drop from an amp to two down into the milliamp region or less. In simple terms you can think of current as the overall amount of electrons flowing and voltage as the pressure or force pushing those electrons. Since the coil steps up the voltage so high (which inversely causes reduces the current) there is a ton of force (voltage) but not a lot of electrons (current) to push. And a resistance of double digit ohms to a few thousand ohms isn't going to make any noticeable difference to 40k volts pushing that current through the conductor. A much more important gauge of a wire is the quality of the conductor itself and how it will age as well as the insulation material and the design of the boot/connectors.
exactly. I run Magnecore and even tho they came in last for modern's test results, I was very happy with the quality of the wire.
" Here we have the Granatelli wires. These wires were the lowest wire OHM resistance wire we have ever tested, at 2 ohms of resistance. Granatelli uses a stainless steel core, wrapped in silver plated copper wiring. This is the highest quality wire we have ever carried, and the wire that we strongly recommend."
My next set this summer!
I was going to post a reply in that thread but never got around to it and my previous post in this thread sums up what I was going to say. I could do a "test" where I weighed each set of wires and proclaimed the one that weighed a few grams more than all others the best because they must use higher quality materials. Same thing with measuring resistance. It's interesting to know and I'm sure it took him some time to set everything up and take the pictures but what he was actually testing is not really as important compared to other characteristics of the wires.
I believe that the Granatelli wires are the best in quality and durability. It is just they do not fit the properly on the spark plugs because the stainless steel connector is recessed too far in the boot. My guess this is an error in assembly.
The early Magnacor's designed for the older 2.0/2.4 DOHC cars had an issue where the boot wouldn't want to seat all the way when used with the slightly shorter Champion 570 plugs but the newer wires specifically for the SRT-4 are supposed to be much better. Sounds like you might have a similar issue. You can try putting some dielectric grease on the boot to see if that helps you get it seated better. As to opinions of durability if you haven't ran them before that's hard for a person to say and quality can be hard to define. If you're basing it on the "test" Modern conducted remember that just because you test a product for something doesn't mean what you're testing for relates to how well it works. I could "test" which wire is a brighter color of red but those red wires might perform the same in the short term.
The early Magnacor's designed for the older 2.0/2.4 DOHC cars had an issue where the boot wouldn't want to seat all the way when used with the slightly shorter Champion 570 plugs but the newer wires specifically for the SRT-4 are supposed to be much better. Sounds like you might have a similar issue. You can try putting some dielectric grease on the boot to see if that helps you get it seated better. As to opinions of durability if you haven't ran them before that's hard for a person to say and quality can be hard to define. If you're basing it on the "test" Modern conducted remember that just because you test a product for something doesn't mean what you're testing for relates to how well it works. I could "test" which wire is a brighter color of red but those red wires might perform the same in the short term.
The problem is not the boot it is fine. Lubrication has nothing to do with this problem. I did use the dielectric grease supplied with the Granatelli wires. The "rubber" boot slides easily over the spark plug. I took out one of the spark plugs and then put it in the Granatelli wire and it snapped in perfectly! Which proves it is just that the metal connector that goes on the tip of the spark plug is recessed too far into the "rubber" boot.
The problem is the stainless steel connector is too far up into the boot. The reach is a 1/4 inch shorter at the stainless steel connector than the stock wires. The "rubber" boot on the Granatelli's is exactly the same as stock "rubber" boot it is the metal connector that is the problem.
I did not base my purchase on their testing as much as my personal experience with solid wire spark plug wires. I had them on my motorcycles and my 1973 Mach 1. Nothing is better than solid wire. I am just heart broken that an error was made in manufacturing the Granatelli's for the Neon SRT-4.
As far as testing goes that is what I do for a living with vehicles and know first hand that real world testing is the best. Many times in my career I have caught problems and solved problems that the engineers missed are never thought of.
I would have to cut off the the boot at the top where it makes contact with the valve cover not at the bottom. The bottom of the boot clears everything just fine it does not make it to the fat part of the plug the problems is the metal connector is recessed too far up in the boot.
Thanks anyway
MPG Plus makes the Granatelli spark plug wires. They told me to put the boot in boiling water. This will allow me to pull the end of the spark plug wire closer to the spark plug!
They responded to my e mail right away. I am pleased and will be getting the Granatelli wires for all three of my cars from Modern Performance.
The End.
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Granatelli spark plug wires
Silver SRT-4 bought 2-25-03 without front plate. My car is so stock. Yes sirey Bob
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