Spark plug question
#3
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Rmeuropean part 99917012990
Bosche Y5ddc
Bosche Y5ddc
#6
Rennlist Member
#7
Premium Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
The original has what I think is a slightly better shaped contact tips but however there's absolutely zero difference in function from my experience.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
![](https://cimg9.ibsrv.net/gimg/rennlist.com-vbulletin/640x480/spark_plug1_c9f616baf5f189089f32c1b82062e7440afa2c77.jpg)
![](https://cimg2.ibsrv.net/gimg/rennlist.com-vbulletin/640x480/spark_plug2_42f04f04d0db6d514b8d5376d6caaa417f51969c.jpg)
![](https://cimg2.ibsrv.net/gimg/rennlist.com-vbulletin/640x480/spark_plug4_168c60ce15e7f2936d97942de6b5d6ba6f2763e3.jpg)
__________________
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
Trending Topics
#9
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Interesting. I have a set installed by a Porsche dealer and the ones I pulled out were identical to the non Porsche ones I put in. Wonder if they had a change at some point. Even the Markings on the ceramic are the same.
#11
Pro
Join Date: Mar 2011
Location: Rock Hill, SC, just south of Charlotte, NC
Posts: 705
Likes: 0
Received 4 Likes
on
4 Posts
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
plugs can look the same, but have different "heat" ranges. A plug has to get hot enough to burn fuel carbonized deposits off the electrode insulators. Not "hot" enough, the plug gets fouled, too "hot" and it can cause pre-ignition, or at least that is way i remember it when i was choosing plugs for my built Cobra's motor. Plugs for street engines are a compromise. As for alternate plugs for our motors, I have no suggestion.
All the best...
All the best...
#12
Premium Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
In this case the number "5" in the Y5DDC is the heat range.
#13
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
True, but the Y5DDC is the proper plug for our GT3's. No reason to use anything else.
#14
Premium Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
#15
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)