Cap and Rotor

[Teal95Jimmy]

As far as I know, the brand has nothing to do with the temperature range of the plug, it all depends on the part number ordered.

[SComp23]

That is incorrect. No other plug has the heat range of the Delco ones.

[dmbrisket 51]

delco plats are one of if not the hottest burning plugs made

[Blazer SS]

I am just wondering what do you mean by heat range and hottest burning plugs? I thought that plugs were rated by the length of their tips and how far that they extended into the combustion chamber. The more a plug extends into the chamber the more heat is transfered to it and to the insulator(hot). The less the plug extends into the chamber the less heat is transfered to the insulator (cold). It is bad for a plug to hold too much heat it will act just like a glow plug and detonate the incoming mixture before the piston chamber fills (knock & Ping) eventually destroying your engine.

[Cloud Strife]

Can anyone provide some internet links for the comparison of the "heat range"? I would but I am not sure what I am looking for. This would provide an end to the war here...

[muddog321]

Here is one explanation:
http://www.carcraft.com/techarticles/64378/

[dmbrisket 51]

there is no war, by hot i mean hot, temperature, a wood fire is hot, but an oxy accedelien torch is hotter, they are both flames but the tempertaure of opperation is much 'hotter' on the second one, gm requires .060 gap and a strong hot spark in that gap, gm's theory of opperation is the bigger the gap the more molicules of air and atomized gas that can fit into that space, and they need a hot (blue not ornge) spark to proporly ignite and burn all the fuel in the cylender, a cool plug will let some raw gas by because it will be unburned, eventually this can burn the vehical down in worst case or junk the cat which is needed on all vehicals 96 and newer due to a post catalitic converter oxyegen sencer...

[SComp23]

Originally Posted by dmbrisket 51

there is no war, by hot i mean hot, temperature, a wood fire is hot, but an oxy accedelien torch is hotter, they are both flames but the tempertaure of opperation is much 'hotter' on the second one, gm requires .060 gap and a strong hot spark in that gap, gm's theory of opperation is the bigger the gap the more molicules of air and atomized gas that can fit into that space, and they need a hot (blue not ornge) spark to proporly ignite and burn all the fuel in the cylender, a cool plug will let some raw gas by because it will be unburned, eventually this can burn the vehical down in worst case or junk the cat which is needed on all vehicals 96 and newer due to a post catalitic converter oxyegen sencer...

Very well put. Now that you know what it means, AC Delco Platinum plugs are the only plugs the provide our vehicle with the proper "heat range" for optimal combustion.

[ZL1power69]

Originally Posted by SComp23

Very well put. Now that you know what it means, AC Delco Platinum plugs are the only plugs the provide our vehicle with the proper "heat range" for optimal combustion.

now that this is established, i've woundered something else; whats the difference between delco plats and delco rapid fires?

[SComp23]

Plats are platinum, rapid fire are copper. If your vehicle is 1996+, you need plats

[hatemyblazer]

back to the "title" of the thread...if you have crank and air/fuel and at least some spark, but it still won't start, it's likely the cap/rotor. i realize this isn't in response to the op's question, but is just an FYI that is related to the title (i replaced mine 2 weeks ago and it fixed my "mystery" problem.)

[mdrush]

I usually have no issue buying Aftermarket parts and Bosch parts are typically pretty good....however I will testify that only Delco plugs work properly in a Vortec V6. I ran Bosch for a week and had misfires on all cylinders.

[dmbrisket 51]

i use some aftermarket parts at work, not all are bad, but some systems on the newer vehicals are just pickie as to what they get tossed at them

[Cloud Strife]

My 99' 4x4 is doing good with my Autolite's that I installed in it. But I have only put on about 11k miles on the plugs.

[dmbrisket 51]

autolite is a ford plug