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Chains & Tensioners

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99710555171
Product Information
Product Information
Timing Chain.
Genuine Porsche duplex timing chain for 911 997 Turbo/GT2 MKI / MKII 3.6L M97.70 2006-2011 – replaces stretched or worn chain to restore precise engine timing.
Sold Each.
x2 Required Per Car.

Fits:
  • Porsche 997 MK1 TURBO 2007-09
  • Porsche 997 MK1 GT2 2007-09
  • Porsche 997 MKII Turbo 2010-11
  • Porsche 997 MKII GT2 RS 2011-11

Diagram Ref No 29

What This Product Does:

  • The timing chain transfers rotational motion from the crankshaft or intermediate shaft to the camshaft(s) (and/or to the secondary shaft) allowing valves to open and close in synchrony with piston movement.
  • A “duplex” chain (two rows of links) provides greater strength and durability under the high loads and high engine speeds typical of a Porsche 911 performance engine.
  • Because the chain drives critical timing, any slack, wear or movement will affect valve timing, ignition timing, engine management, and can result in noise, performance loss or engine damage.
  • In this context, this chain is often replaced as part of a full timing drive overhaul (including guides, rails, tensioners) rather than alone.

Symptoms & When You Should Replace:
  • Rattling or clattering noise from the front of the engine (timing cover area), often heard at idle or on start-up — typical of chain slack.
  • Check engine light related to camshaft or timing chain position sensors, or codes showing timing deviation.
  • Loss of engine power, mis-firing, rough running — could indicate timing drift due to chain wear.
  • High mileage or older engine with original chain: preventive replacement recommended to avoid catastrophic failure.
  • During major engine service (removing timing cover, replacing chains/guides) — because labour is high, replacing the chain proactively makes sense.
  • If inspection reveals visible wear: elongated chain links, damaged chain guides or missing/broken tensioner components.

Why Replacement Matters:
  • Protects the entire engine: A failed timing chain can lead to valve-to-piston contact, major damage and extremely costly repairs — replacing the chain is preventive.
  • Restores proper timing & performance: A new chain ensures correct valve and ignition timing, helping engine run smoothly, powerfully and reliably.
  • Eliminates noise & wear risk: Worn chains and guides cause noise and degrade timing drive integrity — a new chain reduces risk and improves sound.
  • Cost-efficient when engine is opened: Since accessing the chain involves removing major parts (timing cover, possibly front of engine), replacing the chain while it’s open saves re-labour.



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About Chains & Tensioners

Precision Timing Chains & Tensioners – Engine Synchronisation and Reliability for Porsche Models

The timing chain system is one of the most critical components of a Porsche engine, ensuring perfect synchronisation between the crankshaft and camshafts. This precise coordination allows valves to open and close at the right moment, maintaining smooth power delivery, fuel efficiency, and long-term engine health.

At Design911, we supply a comprehensive range of precision-engineered timing chains, guides, and hydraulic tensioners designed to meet or exceed manufacturer performance standards. Each component is manufactured from high-strength materials for exceptional wear resistance and durability — vital for high-revving, performance-oriented Porsche engines.

What Do Timing Chains and Tensioners Do?

A timing chain connects the crankshaft to the camshafts, ensuring accurate valve timing. The tensioner keeps the chain taut to prevent slack, vibration, or noise, maintaining precise timing under all load conditions.

Core Functions:

  • Synchronise engine timing between the camshaft and crankshaft.
  • Maintain valve timing accuracy for optimal combustion and power.
  • Prevent chain slack and noise through hydraulic or spring-loaded tensioning.
  • Ensure long-term reliability in both performance and everyday driving.

Together, these components preserve the exacting standards of Porsche engine operation — vital for both power and longevity.

Why Do Timing Chains and Tensioners Fail?

Over time, wear, oil degradation, and heat cycles can cause timing components to deteriorate. When neglected, they may stretch, seize, or lose tension — leading to severe engine damage.

Common Causes of Failure Include:

  • Chain stretch or elongation, resulting in timing misalignment.
  • Worn or leaking hydraulic tensioners, causing chain rattle on start-up.
  • Contaminated or degraded engine oil, accelerating wear.
  • Broken chain guides from heat stress or material fatigue.
  • Insufficient oil pressure, reducing hydraulic tensioner performance.

A failing timing chain system can lead to poor performance, rough idling, check-engine lights, or — in extreme cases — catastrophic valve-to-piston contact.

Why Replace with Performance-Grade Timing Components?

Replacing aging timing components with manufacturer-quality parts ensures reliable valve timing, smoother operation, and peace of mind.

Key Benefits:

  • Restores precise valve timing for peak performance and efficiency.
  • Prevents engine noise and vibration caused by chain slack.
  • Protects against catastrophic engine damage due to chain failure.
  • Constructed from heat-treated, high-grade steel for long service life.
  • Engineered to match original timing profiles for Porsche engines.
  • Perfect fitment for classic air-cooled and modern water-cooled models.

Whether performing preventive maintenance or a complete rebuild, these timing chains and tensioners deliver race-ready reliability with road-tested durability.

Highlights:

  • Precision-engineered timing chains, guides, and tensioners for Porsche engines.
  • Restores timing accuracy and eliminates start-up rattle or misfire issues.
  • Built from heat-treated alloy steel for maximum longevity.
  • Hydraulic and mechanical tensioners available for various Porsche models.
  • Ideal for performance rebuilds and preventative maintenance.
  • Compatible with air-cooled and water-cooled Porsche engines.

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