Does The Brand Of Spark Plugs Matter

Posted in Ignition Systems

Is there anything wrong with good ol’ ac delco? Should I consider NGK or some other aftermarket brand? What’s your favorite and why?

I would think it doesn’t make much of a difference.

There are 6 Answers for "Does The Brand Of Spark Plugs Matter"

    1. Bob says:

      Years ago I had a 1970 Vauxhall Victor (GM to you), it would only run correctly on GM plugs, but it’s the only time I have found this.

    2. Chris H says:

      NGK is probably the best aftermarket spark plugs for all cars. Its best to find spark plugs that come straight from the manufacturer but if you have an old car like in the 80’s go for NGK

    3. Skypilot says:

      Use whatever the manufacturer specifies. It was designed to run it’s best with that plug.

    4. Timothy P says:

      Ac delco will work but you should really try to get the manufacturer recommended plug.

    5. Robert M says:

      Yes, there IS something wrong with good ol’ Delco. They basically suck in design, waste gas, waste power, and are inefifcient based on the rest of the world’s automotive technology. They don’t create spark every time based on tests done with scopes. They are extinct as Tyranisaurus, with no salvation. I have been testing cars and performance improvements for years. Putting a set of Bosch platinum, Fusion or Nippondenso iridium or Twin TIp’s will improve emisions, power, fuel mileage and drive-ability in almost ANY car. The interesting thing about platinum related plugs is that they create a special reaction with modern fuels and unleash more energy. They reduce carbon by doing so. Many of the finer car maker’s in the world have realized this. Installing Bosch platinum single points in a Saturn, for example, makes the engine “feel” like it has been turbo-charged. Foreign car technology is still ahead of ours by about 10 years. Platinum related plugs also dissipate heat quicker and are ready to spark again sooner. Titanium is the latest plug. These are all special metals with special properties. Try them for yourself. You’ll become a true believer!!!! AC plugs make great garbage pan fillers!!! Even air planes from WWII used fine wire platinum tips for their ability to resist fouling at high temperatures, low temperatures, and various air pressures. Get with it!!!!

    6. Chevyraceman_383 says:

      I don’t know what Robert is talking about.

      I’m race engine builder, with a dyno, and track test alot of stff on the drag strip.

      I have dyno tested and track tested every plug known to man in the past 8 years or so.

      Bosch is ALL WAYS at the bottom of the list.

      Heck years ago I put a set of boschs in my 327. Fouled out before I got out of the driveway.

      No power to be found in those fancy high dollar plugs, split fires, ones with 4 ground straps, etc etc. In fact lost HP with some of them on the dyno.

      If it tells you anything. In my drag car, street car nd every engine I build for customers.. 1 of 3 brand plugs goes in it
      Ac delco (std plug)
      Autolite (std plug or AR racing plugs for turbo/boosted/nitrous engines
      NGK (V power tip)

      I run/use mostly std AC delco plugs unless the combo calls for something AC don’t have.

      Like alot of the aftermarket chevy v8 alum heads needs a .750″ reach, 14mm thread, gasket seat, 5/8″ hex plug… AC don’t have anything to fit that, so I go with autolites on them

      For blown/supercharged/turbo’ed/nitrous engines, You need a short ground strap and a non projected tip. AC really don’t have anything for that. They have the non projected tip plugs (which I use in high compression n/a engines) but std ground strap so as the builder, I then have to use a cut off wheel and cut the ground strap shorter..

      Saves time and money in that case just to use the auti lite AR racing plugs