Spark Plug Upgrade - Page 2 - Chevelle Tech
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post #16 of 29 (permalink) Old Oct 9th, 19, 5:08 PM
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Re: Spark Plug Upgrade

Headers, big block, air conditioning....that #8 plug is a huge bitxh to change. I cross referenced to NGK Iridium plugs. Unless some other reason dictates it, I ain't changing that plug.
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post #17 of 29 (permalink) Old Oct 9th, 19, 9:29 PM
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Re: Spark Plug Upgrade

Please read what I wrote, I wrote it that way because that is the way it works, no need to re-confirm what I already wrote, I don't think.

I do not use Iridium type spark plugs in anything but what they are designed to work in, the hotter sides of multiple spark plug emissions cylinder heads. That means, NOT in American engines.

There was just a discussion about a certain type of spark plug for American engines, totally not workable for what they are being pushed on today. Anyone ever have a two stroke outboard engine that used a very strange spark plug, a "surface gap" type? The firing end of the plug is flat, looks a pancake, with a center electrode and a full round band of porcelain around it, in a large hole in the end of the body, NO side ground electrode.

We spoke of these plugs and what they were, what they were used in, their history, function, and other things, in the topic, which was about heat ranges, plug gaps, and these spark plugs are extremely cold, and only designed for serious electronic CDI ignition systems, battery powered in two stroke engines. My experience with them comes from their being used in the original 1969 thru 1971 Kawasaki H1 500cc two stroke triple cylinder motorcycle street bike engines. The last time I saw these plugs, was in one of those ads that pop up when you are on some sales site, for one of the online speed shops, about 10 months ago, touting them as THE answer to all spark plug problems...in YOUR, and MY auto engine.

It really doesn't take much these days to take something that is going its correct way, and derail it so far off track, it really isn't funny, by a very small bit of misinformation, intentional, or, not.
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post #18 of 29 (permalink) Old Oct 9th, 19, 9:55 PM
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Re: Spark Plug Upgrade

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Originally Posted by Dave Ray View Post
I do not use Iridium type spark plugs in anything but what they are designed to work in, the hotter sides of multiple spark plug emissions cylinder heads. That means, NOT in American engines.
Iridium spark plugs are currently used in GM, Ford and Chrysler V8 engines-which I believe qualify as American engines.

Iridium spark plugs aren't that much different than a standard plug-except the electrodes are coated with a metal that highly resists wearing away. It's not an emissions thing.

Otherwise, the spark they produce is the same as any other spark plug.

You posted asking for people's opinions, I'm happy to discuss and share, you are free to make your own decisions about your spark plugs. You're welcome and best of luck to you.
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post #19 of 29 (permalink) Old Oct 9th, 19, 10:05 PM
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Re: Spark Plug Upgrade

FWIW, the guy who did a dyno tune on my 06 GTO recommended replacing the OEM iridium spark plugs with basic NGKs just one heat range hotter than OEM. He said they will be more consistent (which fits with other comments here). They will need to be replaced more often, but they are inexpensive as well as being very effective.
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post #20 of 29 (permalink) Old Oct 10th, 19, 9:22 AM Thread Starter
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Re: Spark Plug Upgrade

Sorry for the rookie question, but if I wanted to go one heat range hotter than stock for the NGK's and AC Delcos, what Plug # is that? I'm not poking fun, but if I don't have a part # or make/model/year, my local parts employees usually aren't much help.

oops, I originally said R44's and I just did a search again and they're R43XL. I searched for a 1967 427 vette since they're 390 heads.

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post #21 of 29 (permalink) Old Oct 10th, 19, 9:32 AM
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Re: Spark Plug Upgrade

A 43 is colder than a 44 in AC. So 44 would be the next hotter.

In NGK it's opposite. A GR4 is equivalent to AC 45. A GR5 would be colder.
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post #22 of 29 (permalink) Old Oct 10th, 19, 10:03 AM Thread Starter
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Re: Spark Plug Upgrade

Quote:
Originally Posted by Tommy the Cat View Post
A 43 is colder than a 44 in AC. So 44 would be the next hotter.

In NGK it's opposite. A GR4 is equivalent to AC 45. A GR5 would be colder.
Thanks Tom!

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post #23 of 29 (permalink) Old Oct 10th, 19, 10:10 AM
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Re: Spark Plug Upgrade

No problem. The GR4 seems to fall between 44 and 45 but is the next step hotter than the GR5 that is closest to the stock 43.

I hope that all makes sense. It's annoying that NGK heat range goes down when the number goes up. I'm not a smart man and doing counterintuitive math to pick a spark plug makes my brain hurt.
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post #24 of 29 (permalink) Old Oct 10th, 19, 12:50 PM
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Re: Spark Plug Upgrade

OH, PLEASE, EVERYTHING done these days is directly related to EMISSIONS. The GM large HEI came into existence to give an ignition system that would not change in any way for a service interval of 50K miles with NO maintenance, as were other things along the way, and it was stated that Iridium spark plugs were designed to live a longer life. YES, so EMISSIONS do not change during the service life of the spark plug.

As I said, we, yes, ME, and a few other great people designed the large HEI to meet long service life emissions regulations, as many other parts were, and are, INCLUDING IRIDIUM SPARK PLUGS. Since I don't work on later model American engines, I don't have a care about what they have had infest them with useless junk, like Iridium spark plugs.


I am not stupid about current technology, it mostly doesn't apply to earlier engines, and I don't much care about new stuff that doesn't work, like things like E3 spark plugs, Iridium, and other uselessness..
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post #25 of 29 (permalink) Old Oct 10th, 19, 12:59 PM
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Re: Spark Plug Upgrade

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Originally Posted by Tommy the Cat View Post
I don't think there's a nickel's worth of difference between spark plugs, personally. I've always used NGK V-powers, they're under $2. UR6s in my 496. Nothing wrong with AC or Autolite. Old timers will tell you Champions belong in lawn mowers.
This....never noticed anything about pricy plugs that was better.
Went back to a simple Autolite. As you said all it has to do is spark I dont think any of them are magic.
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post #26 of 29 (permalink) Old Oct 10th, 19, 1:29 PM
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Re: Spark Plug Upgrade

Probably a useless FWIW,but something to think about:
I have been drag racing and street driving my car with the same AC Delco plugs for the last 3.5 years. Last time I changed them (changed them just because) it made no difference in ET or MPH at the track.They didn't look bad either.
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post #27 of 29 (permalink) Old Oct 10th, 19, 7:40 PM
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Re: Spark Plug Upgrade

Quote:
Originally Posted by paul bell View Post
Headers, big block, air conditioning....that #8 plug is a huge bitxh to change. I cross referenced to NGK Iridium plugs. Unless some other reason dictates it, I ain't changing that plug.
No kidding... I have 2 inch headers, air cond. tall valve covers, etc... 15 min. to change 7 plugs and another 15 min. just to change #8.

For number 8, I use a standard spark plug socket and remove the rubber insert. This makes it easy to insert and gives you more side to side movement. Then I get a straight wrench and turn it switching back and forth with the open side to give me the ability to re-grab. I also have aluminum heads and always use anti-seize on the threads. This insures that you can use your first and second finger to both screw on and and screw off the plug when loose. No way to get your thumbs in there.
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post #28 of 29 (permalink) Old Oct 11th, 19, 9:45 AM
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Re: Spark Plug Upgrade

I use Atlas C36R4 plugs. I bought a case of them on e-Bay for pennys years ago for my Pontiac 455 and turns out they also fit my 1978 454 w/781 heads..

The only time a plug change made a difference for me is when the plugs were loaded with lead from that gasoline we used back then..
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post #29 of 29 (permalink) Old Oct 11th, 19, 10:08 AM
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Re: Spark Plug Upgrade

Quote:
Originally Posted by hjdca View Post
No kidding... I have 2 inch headers, air cond. tall valve covers, etc... 15 min. to change 7 plugs and another 15 min. just to change #8.

For number 8, I use a standard spark plug socket and remove the rubber insert. This makes it easy to insert and gives you more side to side movement. Then I get a straight wrench and turn it switching back and forth with the open side to give me the ability to re-grab. I also have aluminum heads and always use anti-seize on the threads. This insures that you can use your first and second finger to both screw on and and screw off the plug when loose. No way to get your thumbs in there.
I'm assuming since you can get the wire boot on the #8 plug you can get a foot long piece of rubber fuel hose on it. In cases like this, once the plug is loose I'll put the hose on it and run it out past the headers where I can get my hands on it and thread it out. Works just as good putting them back in too. It's just a flexible extension for your fingers. Heck, I do it like that even when the plugs are easy to get to.

Give a try if you haven't already.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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