using bosch platinum +4
 

i'm wondering if using these plugs will create more heat resulting in piston damage. Any comments appreciated.

A number of forum member run them, have not seen reports of melted pistons.

No, they will not create more heat resulting in piston damage. It's a spark plug, not a blow torch. :D The plug itself can not create enough heat to damage any metal.

They won't create any more heat than any other plug in the same heat range. Nor will they provide a better spark. They are a gimmick. The arc is going to jump the space with the least resistance.

The electrodes will hold more heat and can cause pre-detonation.

What works better is cheap plugs, changed often, compared to overpriced plugs changed at each transmission replacement (if needed).

Over the years I have had probably hundreds of people switch to Plus 4's and probably only 2 complained about them, one wouldn't change his factory wires at around 100,000 and wondered why the Plus 4's didn't help him
The last set I ran, I switched out at around 88,000 miles when doing head gaskets and only because I wanted to try the new Bosch Fuson which I was not pleased with.
Oh, and no, the plugs will not cause overheating of the cylinders or predetenation.

There's a huge difference between having no problems with something, and any actual benefit (as opposed to perceived benefit).

IMHO things that lead owners to do it once and forget about it (150,000 mile coolant, life time brake fluid, life time transmission fluid, etc.) usually come back to bite you in your lifetime. I do not dispute that there may be performance gains at certain loads and rpms. If you like them, change them at some kind of interval. The D1 is so easy to change plugs on, nothing like the pull the-intake-method on my old Montero (about $450 for plugs at the stealership).

And Disco Mike's performance might be more noticed at his altitude vs. the 17 feet above sea level where I am. But I may well try a set next time I change plugs.

Google spark plug comparison. There's a chart some where showing less than a 2% HP gain over regular copper plugs. Probably not anything anyone would notice.

I tried the E3 spark plug, I have them in my snowblower and lawnmower and chainsaw, LOVE THEM in those engines, the lawnmower and snowblower have both been in for over 5 years and still going strong, I can run them at full choke and they will not stall.
Chainsaw is 10 years.
So I tried them in my truck, they have a large ground electrode like the +4's do.
I developed a rough idle when hot, only when hot, ran well down the road.
Changed plug wires.
No change.
The whole truck would shake, increase RPM just a little and problem went away.
Bought $.89 spark plugs and problem went away.
Turns out the ground electrode was holding enough heat that it would ignite the fuel before TDC.
So theirs my $.02.
Granted they are different plugs than the +4's, but the +4's still have a large ground electrode.

I went to bosch 4s. And instantly noticed more torque. And I was replacing NGK iridiums($20 a plug) that were still in good shape. I'm sold on them.

thanks for the info guys.

Chris
89 range rover classic

These are the posts that make guys think there are magic spark plugs :D

To the OP, the plus 4s wont get hotter nor will they have any benefit over what supposed to be in there that cost 1/4 of the price. I see these threads every few weeks and its usually a bunch of bickering. Boils down to the guys dumb enough to pay $10 a plug going at it with the guys who know the $10 plugs dont do anything. Bottom line is a basic copper core plugs changed when they should be changed is all you need. Plus 4, Platinum, Iridium, Bull S***ium, all a waste of money. Said it before and I'll have to say it one more time. The difference you feel when putting in new plugs is simply because you are replacing old worn out parts with new ones. You'll see an identical improvement from $2 NGK coppers over old plugs as you would with the magic plugs over your old plugs.

It's impossible to utilize all 4 of those tips simultaniously on the plus 4 anyway, thats not how electricity works.

On this note, the only advantage I see with a +4 plug is that it would last longer before needing to be changed. With 3 more tips available, the plug will have the proper gap much longer than a standard copper which will wear faster and develop a larger gap than optimal.

True they are said to last longer than copper plugs. I change mine every 6k miles so I can't judge the longevity of the coipper plugs versus their more expensive counter parts. Plugs are so cheap and easy to change though which makes paying a premium so you can ignore them for 100k miles pretty dumb if you ask me.

Anyone who leaves a plug in anywhere near the advertised life of those magic plugs is a few fries short of a happy meal anyway.