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Cayenne, Macan, & Panamera

Cylinder Bore Scoring in Porsche Cayenne, Macan, and Panamera Vehicles with Alusil Engine Blocks

Porsche Cayenne, Macan, and Panamera cylinder bore scoring example

If you own a Porsche Cayenne, Macan, or Panamera equipped with an Alusil V6 or V8 engine block, you may be at risk for cylinder bore scoring. This problem can be a major headache for Porsche owners, leading to engine damage, reduced performance, and costly repairs. In this blog post, we will discuss the symptoms, preventative maintenance, and repair options for cylinder bore scoring in Porsche vehicles with Alusil engine blocks.


What is Cylinder Bore Scoring?

Cylinder bore scoring is a condition where the engine block's cylinder bores become scored or damaged. This can be caused by a variety of factors, including debris in the engine oil, poor engine design, and wear on the engine's components. The scoring can cause increased friction and heat within the engine, leading to decreased performance and engine damage.


Symptoms of Cylinder Bore Scoring

The symptoms of cylinder bore scoring may not be immediately apparent, but they will become more noticeable over time as the problem worsens. Some common symptoms of cylinder bore scoring include:

  • Engine misfires
  • Decreased engine performance
  • Engine oil consumption
  • Engine knocking or ticking sounds
  • Engine vibration
  • Increased wear metals in the engine oil including aluminum, iron, and silicon

How to Prevent Cylinder Bore Scoring

To help prevent cylinder bore scoring, it is important to maintain your Porsche vehicle properly. Some preventative maintenance steps include:

  • Regular oil changes using high-quality engine oil like Driven DT40 or Driven DI40
  • Keeping the engine oil level within the proper range
  • Using a high-quality engine oil filter
  • Reducing the time and mileage between oil changes to 6 months or 5,000 miles
  • Avoiding short drives
  • Using Top Tier premium fuels and fuel additives including PEA (polyetheramine) like Driven Injector Defender to keep fuel injectors clean
  • Checking fuel trims to make sure your engine doesn't have vacuum leaks or bad sensors causing the engine to run rich

How to Fix Cylinder Bore Scoring

Rebuilt Porsche Cayenne S, GTS, Turbo V8 engine

If you suspect that your Porsche Cayenne, Macan, or Panamera vehicle has developed cylinder bore scoring, it is important to have it inspected by a professional mechanic. It can often be detected through used oil analysis and by borescoping each cylinder of the engine. Once cylinder bore scoring starts, there is no way to stop it. Using an engine oil like Driven DT40 or DI40 with increased MoS2 (moly) levels or a slightly thicker viscosity like Driven FR50 for DI50 will help to extend the life of the engine. If the scoring is severe, the only way to fix the engine block is to have it rebuilt or replaced. This can be a costly repair, but it is necessary to ensure that your vehicle is safe and reliable. Your options to fix cylinder bore scoring include the following solutions:

  • For shallow cylinder bore scoring, over-boring the Alusil engine block and using direct Nikasil plating to restore the cylinder bore back to its original size is possible
  • For deep cylinder bore scoring, over-boring the Alusil engine block an additional 1mm should clear up the damage and allow the surface to be Nikasil plated. An oversized piston with matching Nikasil compatible pistons rings would be necessary
  • Dry and Wet Sleeves can be fitted to the engine block to correct for deep cylinder bore scoring if the original bore size must be retained, however the costs involved with this are much higher than using direct plating.

In conclusion, cylinder bore scoring in Porsche Cayenne, Macan, and Panamera models is a problem that should not be ignored. By performing regular preventative maintenance including used oil analysis and being aware of the symptoms of cylinder bore scoring, you can help prevent this problem from happening to your Porsche vehicle. If you do experience cylinder bore scoring, it is important to have it repaired as soon as possible to avoid further damage and to keep your vehicle running smoothly. This would require your local Porsche repair shop to pull your engine and disassemble it so the engine block can be shipped to LN Engineering for repair and reconditioning. We supply new matching pistons with bank specific pin offsets (unlike most factory pistons which do not have bank specific offsets) to improve the performance and longevity of your engine. Nikasil compatible piston rings are included.

Porsche Cayenne, Macan, and Panamera cylinder bore scoring repair

LN Engineering's services for Porsche Cayenne S, GTS, and Turbo models are listed below. Cylinder bore scoring solutions for Macan and Panamera models are not listed below but are available upon request.

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