Wow! That's really unfortunate. I remember when Cayennes, 911s, and Caymans had this problem. I thought Porsche was past that by now...

I think you might be the first Macan owner to have this problem? I don't recall anyone else posting about scored cylinders, yet.

Sorry to hear!

 

Not the first, unfortunately...

See these threads:

https://www.macanforum.com/threads/macan-turbo-cylinder-scoring.73874/

​​​​​​https://www.macanforum.com/threads/cylinder-scoring-engine-replacement-needed.156178/

 

Reviving an older thread….



​​​​​​….. anyone seeing bore scoring on the 2.9L Macan’s ..?

 

Not yet.

 

The 2.9 may be immune from the cracked-piston issue, which then causes bore-scoring. The 2.9 Audi V6 uses a different piston than the 3.0 Audi V6.

 

Is bore scoring still an issue in current Macan engines, namely Macan S? I read somewhere that on current fiat six engines the cylinder surfaces were definitively resolved. True or false?

Also… what’s the experience with air suspensions?

 

The 2.9l TT motors (S/GTS/TURBO) have the SUMEbore iron alloy coating on the cylinders which is supposedly much more durable than the alusil surface used in the older 3.0l V6s.

Time will tell how much more durable....

 

This.... as I am about to take delivery on a '26 GTS

 

Deleted

 

No.

EA839 2.9TT and 3.0T have iron cylinder liners.

 

Ahhh.....not sure where you are getting your information but I trust LN Engineering has done their homework. 3l single turbo units get pressed iron liners, but 2.9l TT units get SUMEbore plasma spray iron alloy.

https://lnengineering.com/products/w...e-scoring.html

While bore scoring plagued earlier generations of Porsche engines with Alusil and Lokasil bores, significant strides have been made with the adoption of advanced iron-based spray coatings—APS (Atmospheric Plasma Spray) and PTWA (Plasma Transferred Wire Arc). These technologies enabled Porsche to retain the lightweight benefits of aluminum engine blocks while achieving the wear resistance and durability of iron bores,

APS (SUMEbore) coatings are featured in high-performance VW/Audi-derived engines, starting with the EA825 4.0L twin-turbo V8 introduced in the 2017 Panamera Turbo (971). This same engine architecture was later used in the 2019+ Cayenne Turbo (9Y0), Panamera GTS, Macan GTS/Turbo, and various Audi RS and S models.

Porsche Models without Cylinder Bore Scoring

• 2016+ Porsche 911 Carrera (991.2) uses PTWA coating for its cylinder bores.
• 2017+ Porsche Panamera Turbo (971) features APS (SUMEbore) coated cylinder bores.
• 2019+ Porsche Cayenne Turbo (9Y0) uses APS (SUMEbore) bore coating technology.
• 2019+ Porsche Macan Turbo and GTS models utilize APS (SUMEbore) cylinder coating.
• 2017+ Porsche Panamera GTS benefits from APS (SUMEbore) coated bores.
• 2019+ Porsche Macan S uses the EA839 V6 with pressed-in cast iron liners.
• 2019+ Porsche Panamera 4 is powered by the EA839 V6 with iron liners.
• 2019+ Porsche Cayenne Base model employs the EA839 V6 with thin-wall iron sleeves.
• 2016+ Porsche 718 Boxster and Cayman (all variants) use PTWA bore coating.
• 2014+ Porsche Macan Base models use iron-block VW/Audi 2.0T engines.

The Mezger Engine: A Gold Standard in Porsche Durability

Often heralded as the holy grail of modern Porsche engines, the Mezger-designed flat-six stands in stark contrast to the M96/M97 family when it comes to long-term reliability and engineering robustness. Derived from Porsche's motorsport lineage and originally developed for endurance racing, the Mezger engine was used in 996 and 997 Turbo, 996 and 997 GT2, and 996 and 997 GT3 models:

• 2001–2005 Porsche 911 Turbo (996) uses the Mezger engine with Nikasil-coated cylinder bores.
• 2002–2005 Porsche 911 GT2 (996) features the Mezger engine with Nikasil-plated bores.
• 1999–2005 Porsche 911 GT3 (996) is equipped with the Mezger engine and Nikasil bores.
• 2006–2009 Porsche 911 Turbo (997.1) continues with the Mezger engine and Nikasil coating.
• 2007–2009 Porsche 911 GT2 (997.1) uses the Mezger engine with Nikasil-lined cylinders.
• 2007–2011 Porsche 911 GT3 and GT3 RS (997.1 and 997.2) retain the Mezger engine with Nikasil bores.

 

LN has something wrong.

Starting in 2022 the Macan S, GTS and Turbo all use the same 2.9L engine.

 

yeah that list is incorrect, my MY2020 Cayenne base engine failed due to bore scoring. 52k miles

 

That car has the Audi 3.0L twin scroll single hot-V turbo?

Was it just bore scoring or did you have a piston crack/failure too?

 

For the Audi 3.0 single turbo engine, the root problem are pistons that crack (starting at the skirt), which then causes bore-scoring as the broken piston destroys the cylinder wall.
If the piston does not crack, this cast-iron cylinder lined engine is not susceptible to bore-scoring.