Best Spark Plugs Ever Used
 

Iridium High Performance Plugs that Really Make a Difference

http://www.densoproducts.com/product...ctCategoryID=1

Best Spark Plugs Ever Used
 

Iridium High Performance Plugs that Really Make a Difference

http://www.densoproducts.com/product...ctCategoryID=1

Re: Best Spark Plugs Ever Used
 

They come pre gapped. ?

Re: Best Spark Plugs Ever Used
 

They come pre gapped. ?

Re: Best Spark Plugs Ever Used
 

USE THE NGK ONES

Re: Best Spark Plugs Ever Used
 

USE THE NGK ONES

Re: Best Spark Plugs Ever Used
 

I personally don't like precious metal fine wire spark plugs, especially the iridium plugs. Sure, they last 3x as long, but cost 4x the price. For someone like me who changes their own plugs, this doesn't make financial sense. Fine wire plugs electrodes, kind of like sharp edges in your combustion chamber, run hot and can cause detonation. This is one of the reasons you'll never see a precious metal plug on a race car. The double platinum and iridium plugs have a platinum or iridium wafer bonded to the side electrode. Under detonation, it is possible to dislodge this wafer and now you have a very hard piece of metal floating around in your cylinder.

I go through a lot of spark plugs, we've got 44 cylinders in our driveway. 2 v8 trucks, 2 v8 cars, a v8 boat, a lawn mower, and 3 1 cyl motorcycles. Spark plug quality control is very good, and I see little appreciable difference between brands. I've had one bad plug, an NGK, but I believe it was dropped at some point after manufacturing. I believe NGK and AC Delco make the best plugs, but wouldn't go out of my way to buy them. If Champion is available or on sale, that is what I would buy, and did. Autolites are at the bottom of the list, but I would buy them if the price was right.

Re: Best Spark Plugs Ever Used
 

I personally don't like precious metal fine wire spark plugs, especially the iridium plugs. Sure, they last 3x as long, but cost 4x the price. For someone like me who changes their own plugs, this doesn't make financial sense. Fine wire plugs electrodes, kind of like sharp edges in your combustion chamber, run hot and can cause detonation. This is one of the reasons you'll never see a precious metal plug on a race car. The double platinum and iridium plugs have a platinum or iridium wafer bonded to the side electrode. Under detonation, it is possible to dislodge this wafer and now you have a very hard piece of metal floating around in your cylinder.

I go through a lot of spark plugs, we've got 44 cylinders in our driveway. 2 v8 trucks, 2 v8 cars, a v8 boat, a lawn mower, and 3 1 cyl motorcycles. Spark plug quality control is very good, and I see little appreciable difference between brands. I've had one bad plug, an NGK, but I believe it was dropped at some point after manufacturing. I believe NGK and AC Delco make the best plugs, but wouldn't go out of my way to buy them. If Champion is available or on sale, that is what I would buy, and did. Autolites are at the bottom of the list, but I would buy them if the price was right.

Re: Best Spark Plugs Ever Used
 

been running these in my race car for yrs never had a problem best plug i ever used for times. The hotter the plug the wetter you run the hole. When you have $20k in the motor you don't skimp on cheap plugs. Nascar boys run them in AC Delco brand same i use, Some of the nascar boys run Bosh Platium, not i the racing fuel eats the platium coating off lol. I run AC Delco Iridiums in my Vette too they make a hugh difference in the running of it as well. WORST Plug i have ever used is NGK i never use them they are 100000% junk. Theirs 13 cars and 10 vessels in the yard so plugs aren't lack here either.

No they aren't pre gapped to your needs but easy to gap.

Re: Best Spark Plugs Ever Used
 

been running these in my race car for yrs never had a problem best plug i ever used for times. The hotter the plug the wetter you run the hole. When you have $20k in the motor you don't skimp on cheap plugs. Nascar boys run them in AC Delco brand same i use, Some of the nascar boys run Bosh Platium, not i the racing fuel eats the platium coating off lol. I run AC Delco Iridiums in my Vette too they make a hugh difference in the running of it as well. WORST Plug i have ever used is NGK i never use them they are 100000% junk. Theirs 13 cars and 10 vessels in the yard so plugs aren't lack here either.

No they aren't pre gapped to your needs but easy to gap.

Re: Best Spark Plugs Ever Used
 

I use NGK in my Yamaha, it did nOT seem to like anything else??

My truck has AC Delco in it and believe they are factory. I will be tuning soon as with the new gas and almost 75,000 miles I think it is time.

I have always use Auto lite, I find they work great and I am old school were I tune every spring and change the plugs, so there only there at tops 20,000 mile

But I have used Champion and AC in the past with out problems!

Bottom of my list is Awfull Crummy (AC)

Re: Best Spark Plugs Ever Used
 

I use NGK in my Yamaha, it did nOT seem to like anything else??

My truck has AC Delco in it and believe they are factory. I will be tuning soon as with the new gas and almost 75,000 miles I think it is time.

I have always use Auto lite, I find they work great and I am old school were I tune every spring and change the plugs, so there only there at tops 20,000 mile

But I have used Champion and AC in the past with out problems!

Bottom of my list is Awfull Crummy (AC)

Re: Best Spark Plugs Ever Used
 

Skools - I use NGK BU8H's in my Merc and they've been great!! Cost $2.19 each and I haven't fouled one yet. This is the plug that all the screamandfly members recommend for the mercs. Now . . . I'm kinda curious to see what I've been missing.

Re: Best Spark Plugs Ever Used
 

Skools - I use NGK BU8H's in my Merc and they've been great!! Cost $2.19 each and I haven't fouled one yet. This is the plug that all the screamandfly members recommend for the mercs. Now . . . I'm kinda curious to see what I've been missing.

Re: Best Spark Plugs Ever Used
 

BS, I'm using the same in my Merc. I also went from Bosch to NGK in my M3 (car) and like the NGK's much better. I know of people that tried the Denso's in their cars and they didn't perform as well, guess it depends on the car too.

I think for performance the non- precious metal plugs are better. Platinum plugs and such are better for longevity, the reason lots of cars first tune-up is 100k miles.

Re: Best Spark Plugs Ever Used
 

BS, I'm using the same in my Merc. I also went from Bosch to NGK in my M3 (car) and like the NGK's much better. I know of people that tried the Denso's in their cars and they didn't perform as well, guess it depends on the car too.

I think for performance the non- precious metal plugs are better. Platinum plugs and such are better for longevity, the reason lots of cars first tune-up is 100k miles.

Re: Best Spark Plugs Ever Used
 

Got the denso's in my 78 yamaha 650 XS motorcycle. With that old engine they were the only plugs that would keep carbon from building up too much. No need for them in the I/O.

Re: Best Spark Plugs Ever Used
 

Got the denso's in my 78 yamaha 650 XS motorcycle. With that old engine they were the only plugs that would keep carbon from building up too much. No need for them in the I/O.

Re: Best Spark Plugs Ever Used
 

autolites all the way worst i ever had was ngk all i could get for my dirt bike changed many of them

Re: Best Spark Plugs Ever Used
 

autolites all the way worst i ever had was ngk all i could get for my dirt bike changed many of them