JG 996T

ha ! They only have 3 “pieces” left. Otherwise, “discontinued.” (Tried to put 6 pieces in cart)

JG 996T

Here you go - looks a lot like Bosch



NGK R

JB911

The NGK vehicle finder only lists the standard version of the DCPR8 plug, but a Platinum version exists.
Here they are compared, but only the standard one is listed as compatible for the 997 GT3 cars. Would the Platinum version be a good choice, and not listed as compatible because the Bosch plug for GT3 was never offered in Platinum?

The reason I found the Platinum version was because I searched for BMW DCPREKC and found that the BMW motorcycle riders opt for the Platinum version, or the single ground electrode Iridium version.
So here are the two dual ground electrode plugs compared. There is a difference in the projection, the Platinum says "extended projection":

https://www.ngk.com/compareproducts

Rockauto, $5.98 for the standard NGK:
https://www.rockauto.com/en/parts/ng...park+plug,7212

JB911

Ok, NGK's website is an irritant, I does not retain the compared items. Here's a screen shot:

JB911

The Platinum version of the NGK is stock number 7415
When you search NGK's site for Porsche 997 GT3, only the standard version comes up. This is probably because the Bosch Y5DDC was a standard plug.
I posted the screen shot of the two NGK plugs, and these are the only ones with dual ground electrodes.
The Platinum plugs are between $6-$14 depending where you get them. FCPeuro has them, Ecs tuning, Jegs, autohauz etc

Here's a link
https://www.carid.com/ngk/laser-plat...-mpn-7415.html

So to sum up the NGK option:

DCPR8EKC is standard, NGK site lists as their plug for the 997 GT3 cars
DCPR8EKP is the Platinum version, not listed for the 997 GT3.
However you interpret this, it is most likely because Porsche only used a non Platinum plug, the Bosch Y5DDC
It would be interesting to call NGK and speak to a qualified rep and ask about the Platinum version. Otherwise, the standard version is probably the best choice. Ferrari, BMW, Alfa and other cars come with NGKs...

JB

JG 996T

All Maintenance up to date.
Plugs coils oil brake flush
Running strong.

NGK and Bosch

JB911

Still curious if the platinum version of the NGK is worth getting, or just stick with the regular one(?)

John

Upscale Audio

I'm late to the party on the plugs. I called a local dealer and asked for 999 170 129 90 and they stated there were 23 at the main Porsche warehouse. I asked if this was a newer substitution and he said no.

Did I misread the thread?

The Ebay dealer lists them too Ebay

JB911

This and the other thread spell it out-Bosch discontinued the Y5DDC plug. If you can find them at dealers, expect to pay around $30-$40 per plug while supplies last. The NGK plugs seem like the best choice, and I posted online links with prices(between $5-$14 more or less)There is a platinum version as well. Keep in mind Ferraris use NGK so I consider them a good choice(I suppose) Cup racing plugs also made by NGK.
Don't bother with eBay, supplies dried up-I probably bought the last of the Y5DDC in Porsche boxes.
The blue box Y5DDC-vendors don't have them in stock and refunded many who ordered them

Here's the other thread, and I mirrored most of the info/details and vendors there:
https://rennlist.com/forums/997-gt2-...997-1-gt3.html

John

JG 996T

How would platinum improve performance? L9ngevity?

I have put about 350 miles on the car since plug change and it’s running great.

JB911

Since you're the first to run these NGKs, let's see pictures to compare to used Y5DDCs-
Problem is, it'll be a while until they need replacement

I guess Platinum plugs are supposed to last longer-the problem with spark plugs, the marketing etc, information is all over the place. There might be articles that one could trust from builders, tuners and hopefully manufacturers, and I'll search further out of curiosity. As far as our cars, the racing NGK costs $115 each and I'd like to see what they look like after 30 hs of use.
I might also search for aviation spark plugs since failures up there would be catastrophic.
In the 80s Mobil ventured into synthetic aviation oil and it was catastrophic, following a lawsuit from the deaths that ensued. So in the aviation industry there seems to be essential testing and regulation. Twin plugs of course, and there are quite a few horizontally opposed 6 cyl engine designs. Porsche even had an airplane engine in the '80s/'90s.

There is one catastrophic event blamed on a defective Bosch, I would think maybe whoever installed it might have dropped the plug before installing it. It happened to rennlister Namvet, and once it broke off inside, it destroyed the cylinder/piston-left an imprint on the head:


Here's the complete discussion:

https://rennlist.com/forums/997-gt2-...e-found-3.html

John

JG 996T

The above pic is Bosch plug after 3 years use. I’ll bump this in three years. Interesting that Cup use NGK.

i read the failure thread… was it the plug or the lack of the fuel pump fuse causing a lean condition then detonation…then boom.?

(I bought an old Jeep once for cheap. Changed the plugs and coils/wires - 2 of 6 plugs were toast, like no porcelain at all. Lol.)

JB911

Yeah that catastrophic engine failure thread got complicated, either way, fuel pump fuse issue or the plug disintegrating, either being dropped or detonation, it was crazy.

So in the aircraft world, they do plug maintenance, even rotate plugs after cleaning since they have twin plugs-
They do this to ensure the electrodes are wearing out evenly-
They look a lot like our plugs, with twin ground electrodes:

In the aviation world these are considered "massive" electrodes, and the newer iridium and ruthenium plugs are "fine" wire plugs.

Here's an article discussing the two types, with some testing. Keep in mind aircraft engines usually operate bellow 3000 rpm, and the fuel is leaded{
https://www.aviationconsumer.com/mai...ch-spark-plug/

And imagine the powerful engines culminating in the WWII period, only possible with 150 octane Tetraethyl lead, patented by the Standard Oil company. Those motors would all explode if it wasn't for the extreme octane-

JB

ngng

jb- are you a pilot or an AMT?

JB911

No, my dad was a private pilot and my childhood friend is a pilot, helicopter and fixed wing. I'm a cinematographer and started shooting with Cineflex(on Jet Rangers etc, no more R-44s for me)and I got to fly a 172 after my friend gave me an instant lesson on the ground before takeoff And he assisted landing which is the hard part, lol
Cineflex nose mount/gimbal:


He now flies the new Agusta rescue helicopters the county has here, which replaced the aging Bell fleet.
We've done quite a bit on Jet Rangers/Long Rangers and R-44s which he now refuses to fly-he also refuses to fly the turbo twin flat 6 planes, too dangerous despite decades of existence. He got the special training where they cut off one engine by surprise and you need to control the thing. Many twins go down because of that.
But I remember being around planes since I was around 5 and flew with my dad at an early age.
The point of bringing up aviation plugs is I figured there had to be quite a bit of data and testing-

John