Spark Plugs

[RyanZ71]

[Supercop8100]

I have heard that the AC Delco Platinums are identical to the Irridiums for half the price. I use platinums and I cant tell the difference. But I only use AC Delco in my 8.1L.

[Chad H]

I have used NGK and had success. The thing I like the most is that they smoothed out the idle. But, I installed 8mm wires at the same time. So, I don't know if it was the wires or the plugs.

[RyanZ71]

How much did the wires cost you and where did you get them from?

[FSTDL]

You know I used to think that its best to use the brand of plug that the vehicle is.But I have had a number of bad AC delco spark plugs over the years and let me tell you something here.

I have been installing Bosch standard copper core plugs for 25 years in Mercedes Benzes and actually had done all the runability at the dealer where I work for 10 years and have only had maybe 2 or 3 bad plugs in that time.

The platinum plugs are junk!But there copper cores are just unbeatable.

You know its kind of a b*T**h trying to figure out why your brand new small block that you just put together is popping and running like cr*p.

or you finally due a tune up on you truck and now it has a miss.

When I get the Bosch plugs from Auto Zone or where ever,the counter person trys to tell me I'm making a mistake.But I have screwed more plugs in than most anyone.

Thats my take on plugs.

Phil

[Chad H]

How much did the wires cost you and where did you get them from?

 

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Hey Ryan,

I purchased my plugs and plug wires from Thunder Racing. If I had to do over again I would have went with Magnecore or MSD. I ordered Talyor wires from Thunder Racing. The plugs were great but the plug wires didn't fit that well. On the driver's side of my tahoe one kept getting in the way of the steering shaft because of its length. I finally got it twisted out of the way, but it still annoyed the hell out of me. But, honestly, I too have been looking at AC Delco plugs and plan on changing the plugs and plug wires on this truck every 25,000 miles. Seem's like a little much, but I love this truck and I want it running top notch all the time. The type of NGK I ordered was TR55(I am pretty sure). They are d**n good plugs and really improved my idle. But, I would wait for some more opinions from the AC Delco freaks. They have about changed me over from NGK to AC Delco.

[RyanZ71]

Thanks for the info. I myself currently have the iridium plugs in my truck with less then 10,000 miles on them and I am not happy at all, it seems the idle worsened when I changed out the stock Platnium plugs, so I am probably going to try the AC/Delco rapidfires next, I used them in my old 93 Caprice 9C1, (police package) as well as my old 95 Crown Victoria P71 (Police Interceptor) and they worked well for me, I just need to find a good set of wires now.

[RyanZ71]

no, I didn't re-gap them as the instructions stated in bold letters not to deviate from the pregapped settings. I just changed out the Iridiums this afternoon, with less then 10,000 miles on them they seemed to have been carbon fouled somewhat, so I might have something else going on with them. No worries though, I got the AC/Delco Rapidfires in now it fired right up and there is a slight improvment in the idle. I am going to be doing the cleaning of the throttle body as well as changing out the fuel filter and will see what happens with that.

[gmcjoe]

I also run the NGK TR55 plugs from Thunder Racing. ($2.00 each)

 

I gap them at .055

 

Personally, on a stock ignition setup, factory delco plugs and wires are fine. I don't see any gain other then 'just because' from my NGK Plugs and red Taylor wires

 

BTW - my taylors fit just fine.

[silverado3500]

I voted for the NGK, but I run either those, or the stock AC-Delco plugs. I've been happy with both

[Black02Silverado]

Your suppose to change your plugs????

 

JK, I have 65k on the originals and it is runing fine and the fuel mileage is still great, I figure don't fix what isn't broke, but will go with AC Plat's again.

[mcreyaufmiller]

I like the rapid fires, they were strongly suggested by a member over the P2's that I had been running. I put them in and the idle smoothed out, truck ran a lot better. Now that MSD offers a coil for my truck I will be getting it soon. I love the 8.5 mm super conductor wires, They have performed nicley. I will be using their products for a while if they are all built to the same quality that the wires were.

[MR1911]

Ngk tr55's over here too, been useing them since the truck had about 15k.I change them when they are at 10-15k never had a bad one yet .Just got a set of Accel 8mm Extreme 9000 wires to replace the stock ones, I think its time with 55k on them .

[Burrito]

Can someone explain the difference between the 3 AC Delco plugs? I don't know jack about spark plugs.

[RyanZ71]

Can someone explain the difference between the 3 AC Delco plugs?  I don't know jack about spark plugs.

 

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It's all about the cores in the spark plugs. The Rapid Fires are the old traditional copper cores, the Iridiums of course have the Iridium Cores.

 

Rapid Fires get changed out every 30,000 or so, the Plats get done every 100,000 (though I would NEVER go that long with them in there, more like 75,000 miles) and same with the Iridiums, supposed to be a 100,000 mile plug, though again I would never leave a plug in there that long. (just like the Death Cool Coolant)