Discussion in 'OT Driven' started by slimjim, Mar 3, 2009.
I bought some Autolite platinums, but I don't know if they're good or not.
I usually run NGK
not a fan of autolites.. prefer ngk's or delcos
I'm not a fan of platinums at the pucks seemed to fall off too soon and then leave too large of a gap.
However, I've heard (never tried) Iridium plugs actually working quite well.
Conventional I liked NGK (TR55s for my old Camaro).
You should get the same ones that came with the car. The cylinders' shapes were designed with that specific sparkplug's combustion pattern in mind.
Platinums and Iridiums tend to retain too much heat under high stress, which is a problem for turboed engines because it can cause knock, but that probably doesn't affect many people here.
NGK, plain jane single contact plugs one heat range colder that the stock plugs.
its a rare thing to see someone that actually knows what they are talking about.
the sparkplugs were used for a reason, the manufacture just didnt throw in a random set of plugs for the hell of it, when the engine is designed, everything is taken into consideration for compression reasons, cylinder shape, pistons, etc.
now, this doesnt really matter much when talking about some random engine in your honda civic, but still.
anyways, i use ac delcos
But don't the non-manufacturer brands design them to exactly match the stock plugs?
seriously... have you ever seen a spark plug? the tips are all the same....
and there are definetly a lot of variations in cylinder shapes.... hmm cirlcle, circle and... circle.
maybe if you are talking about head shape, but even then it wouldnt matter
Realistically, as long as you get the right heat range and set the gap properly, it doesn't matter what you use.
not exactly, but not that it would actually matter
i have a high compression engine, and i put a spark plug in that i matched up with an old one, it was just a TINY bit longer.. as in the thickness of like 3 pieces of paper, i turned the engine over for a sec, then took the plug back out, and the gap was closed
after i cleaned the carbon off of the pistons, you can see where it hit the plug
cylinder shape doesnt matter, its the piston you have to worry about, but on these shitty dished low compression engines it doesnt even make a difference
but still, i always use the stock shit that came with the car.. for instance, instead of buying some msd wires, i would rather buy the ac delcos.. but thats just me
Delco makes some good shit for not being a "huge" name.
Our built 3.1 engine runs like total shit on basically any plug except Delcos.
We use NGK for our 2 Acuras and the 3 GMs all have Delcos, they all have built motors too, so may as well spend less....and get a better plug
What motor are the plugs going into?
Doesn't matter NGK should make a plug for it, if not, you bought the wrong heads lol
NGK...TR7's (2 steps colder) for my application...never any problems.
Of course I've seen sparkplugs. The original ones in my current car had three negative electrodes arranged in a circle around the positive electrode; the ones I have right now only have two negative electrodes, but in a similar arrangement. Newer models of my car use the kind you're familiar with, with the single negative electrode that wraps over the end of the positive electrode. I can't use those in my older engine because they foul within a few hundred miles, even when I put hotter plugs in -- when I tried that, they still fouled, and I got bad knock at high RPM from all the extra heat they retained. Went back to the stock plugs and all was well.
They're not all the same, and design does matter. Why do you think they even have more than one design?
i put delcos in my 302 and every once in a while they would just randomly quit firing, i had 6 ac delcos and 2 accel plugs in it
I used Delcos.
I almost always use Delco plugs, occasionally an Autolite if I'm in a pinch or there is no exact Delco cross reference.
NGK... period. Your silly to waste money on Delco's or Autolites really...
an acdelco iridium plug costs $6.99 and a NGK iridium costs $9.99
Regular NGK's, any other and the car has misfire issues up top or doesn't run right. Granted, my car is turbo
That's not that extreme, but always love the weird shit people do for temp fixes
Back when my dad was racing his Camaro in the late 70s, they did a number of crazy things, bent a push rod one round, hammered it out and put it back in. Or the time their motor toasted a rod so fixed it with 7 good rods and some off the shelf one