CP-Carrillo Connecting Rods Set for Porsche 9A1 2009+ 3.4/3.6/3.8 Non-Turbo with WMC Bolts
sku: PR_B9A1_0HS_5512B6H

CP-Carrillo Connecting Rods Set for Porsche 9A1 2009+ 3.4/3.6/3.8 Non-Turbo with WMC Bolts

$1,845.90

IN STOCK

CP-Carrillo connecting rods are fully machined from a proprietary 4330m alloy forging for strength and durability. Rods are available with 2 types of bolts: The standard WMC-H7 (H11) bolt with a UTS of 220ksi and our upgraded CARR-S7 (MP35N) bolt with a UTS of 285ksi. The CARR upgraded bolt is a good choice if planning on revving the engine higher than 8500rpm. All our bolts are manufactured with asymmetrical threads, each thread has a slightly different design than the previous giving the bolts an evenly distributed thread engagement. This helps increasing the clamp load and fatigue life of the fastener.

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Description

Connecting rod part number with WMC bolts: PR_B9A1_0HS_5512B6H

Connecting rod part number with optional CARR bolts: PR_B9A1_0HS_5512B6S

Important Update: CP-Carrillo Connecting Rod Bolt Installation

CP-Carrillo has provided updated guidance regarding connecting rod bolt installation, particularly the relationship between bolt stretch and tightening torque. The most important takeaway is that achieving the specified bolt stretch takes priority over the published torque range.

DOWNLOAD 21 STEEL BOLT INSTRUCTION SHEET v51021Download

Bolt Stretch vs. Torque

CP-Carrillo recommends measuring bolt stretch during installation rather than relying on torque alone. Bolt stretch provides a more accurate indication of the clamping force applied by the fastener. While each bolt has a specified torque range, CP-Carrillo confirms that it is acceptable to exceed that range when necessary to achieve the required bolt stretch, provided the bolts are properly lubricated and installed according to their instructions.

Always reference the supplied CP-Carrillo installation instructions for the correct stretch and torque specifications for your specific bolts.

Why Multiple Tightening Cycles Matter

CP-Carrillo has found that bolt stretch and torque readings can change slightly during repeated tightening. As bolts are tightened and loosened, the mating surfaces of the threads and beneath the bolt heads become progressively polished, reducing friction.

During CP-Carrillo’s testing:

  • When bolts were repeatedly tightened to the same torque, the resulting stretch increased slightly with each cycle.
  • When bolts were repeatedly tightened to the same stretch, the torque required decreased slightly with each cycle.
  • After approximately 10 tightening cycles, the readings stabilized and became consistent.

This explains why torque readings may change during repeated assembly, even when tightening to the same bolt stretch.

CP-Carrillo’s findings do not establish a requirement to cycle every bolt 10 times, but that when installing the bolts, the stretch and torque readings need to stabilize and be consistent. Installers should follow the manufacturer’s current installation procedure and monitor both torque and stretch throughout the process. When in doubt, contact CP-Carrillo for further advice and instruction.

  • Proper Lubrication Is Essential
  • Always use the CP-Carrillo fastener assembly lubricant supplied with your connecting rods.
  • Apply the lubricant to both the bolt threads and the underside of the bolt head (or bolt seating surface), as directed in the installation instructions.
  • Proper lubrication is critical to achieving consistent bolt preload. Do not substitute engine oil, grease, or another lubricant, or mix other lubricants with the supplied assembly lubricant.

Important Installation Reminders

  • Record the initial rod bolt length prior to installation.
  • Measure bolt stretch using an appropriate bolt stretch gauge.
  • Monitor both torque and stretch during tightening.
  • Do not rely on torque alone to verify proper bolt preload
  • Investigate any significant or unexpected changes in the torque required to achieve the specified stretch.
  • Do not use an impact gun to start connecting rod bolts.
  • Discard older CP-Carrillo instructions stating “Do Not Exceed” for the published torque range. Those instructions are obsolete.

Final Recommendation

Correct bolt stretch, consistent tightening, and proper lubrication are essential for connecting rod bolt installation.

Always use the supplied CP-Carrillo assembly lubricant and follow the latest installation instructions provided with your connecting rods.

Fits: Porsche 981, Porsche 987.2, Porsche 997.2

Important: Before ordering, always confirm that the part fits your specific type/model/engine.

Additional information

Weight 12 lbs
  • Images are stock photos. Actual product may vary. While we strive to ensure that all product images and descriptions on our website are accurate, slight variations in appearance may occur due to updates in design, manufacturing processes, or material finishes. These differences do not affect the functionality or quality of the product. If you have specific concerns or need more details before purchasing, please contact our customer support team for assistance.
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Some products sold by LN Engineering LLC or on https://www.LNengineering.com contain or may contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. LN Engineering has chosen to provide a warning based on its knowledge of the presence of one or more listed chemicals without evaluating the exposure. Products may contain chemicals in amounts acceptable by the safe harbor levels as outlined by Proposition 65, or not at all, however we have chosen to issue this warning on all of our products as an act of caution.

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