ZRP BMW 3.0L N55 & S55 I-Beam Connecting Rods
999.99€
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The ZRP I-Beam Connecting Rods for BMW’s 3.0L N55 and S55 engines bring strength you can count on when power levels rise. Each rod starts with 4340 high-tensile steel, shaped to handle heavy load cycles while still keeping weight under control. It’s a design built for engines that see hard use, big boost, and those long pulls that tend to expose weak links.
ZRP uses a straight-cut pin end that works only with aftermarket pistons, but that choice gives the small end extra strength. The AMPCO 18 bushings help here too. They hold oil well thanks to a radial groove built into the surface, and they resist wear even when the engine spends more time at higher RPM than BMW originally planned.
Every rod goes through shot peening to ease stress in the metal, followed by a multi-stage heat-treat process that improves stiffness. The tolerances stay tight from start to finish, which means the oil clearances land exactly where they should. Bend and twist are checked, measured, and corrected so each rod behaves the same way under load.
ARP 2000 fasteners come standard, rated to 220,000 psi, and you can move to ARP L19 if you want the extra clamping force for more demanding setups. The kit includes ARP moly and clear fitting instructions, though most builders already have their own rhythm when assembling an N55 or S55.
For anyone pushing past stock limits on these engines, these I-Beam rods offer the kind of confidence that makes tuning and track days far more enjoyable. It’s strength with purpose — nothing extra, nothing wasted.
FEATURES
- I-Beam Shape for extra rigidity
- Two-Piece forging for great strength
- Shot Peening for improved fatigue life
- Magnaflux Inspection guarantees that the consistency of the forged material meets our high-quality standard
- Double ribbed caps for added support
- Multi Stage Heat Treatment for maximum strength, dimensional stability, and fatigue life.
- CNC machining for superior tolerances, precise as much as 0.0002″
- Center to center is maintained under .001″ tolerance
- Finite Element Analysis (FEA) Computer generated stress analysis of con rods
- Optimal balancing for weight matched sets of ± 1gram
EXTENDED MACHINING CHARACTERISTICS
- “Straight Cut” Pin End – Suitable for aftermarket pistons
- Dowel sleeves for perfect fit and accurate re-assembling
- Lipped Cap Relief for improved big-end integrity at extreme application
- Grooves in Thrust Face for weight reduction
APPLICATIONS
- 2010–2013 BMW N55B30 E82/E88 135i
- 2012–2016 BMW N55B30 F20/F21 M135i
- 2014–2018 BMW N55B30 F22/F23 M235i
- 2015–2018 BMW N55B30 F87 M2
- 2009–2013 BMW N55B30 E90/E91/E92/E93 335i
- 2012–2017 BMW N55B30 F30/F31 335i
- 2009–2013 BMW N55B30 E60/E61 535i
- 2011–2017 BMW N55B30 F10/F11 535i
- 2011–2017 BMW N55B30 F07 535i GT
- 2012–2018 BMW N55B30 F32/F33/F36 435i
- 2013–2018 BMW N55B30 F15 X5 sDrive35i xDrive35i
- 2014–2019 BMW N55B30 F16 X6 xDrive35i
- 2015–2019 BMW N55B30 F26 X4 xDrive35i
- 2011–2015 BMW N55B30 F25 X3 xDrive35i
- 2015–2020 BMW S55B30 M3 Sedan
- 2015–2020 BMW S55B30 M4 Coupe
- 2015–2020 BMW S55B30 M4 Convertible
- 2015–2015 BMW S55B30 M4 GTS Coupe
- 2019–2020 BMW S55B30 M4 CS Coupe
- 2019–2020 BMW S55B30 M2 Competition
NOTES
Horsepower range for these rods is 175HP. per cylinder with ARP 2000 fasteners and 200HP with ARP L19 fasteners
ADDITIONAL INFORMATION:
| Brand | |
|---|---|
| Shape | I-Beam |
| Material | High Tensile Steel 4340 |
| Length | 144.22mm |
| Small End | 22.00mm |
| Bolt Size | 3/8" |
| Application | 3.0L N55 / M4 S55 |
| Big End | 53.635mm |
| B.E Width | 20.88mm |
| Set Of | 6 |
| Discplacement | 3.0L |
| Pin Size | 22.00mm |
| Series | – |
| Engine | 3.0L S55B30, 3.0L N55B30 |
| Note | Non-Tapered Pin End / Straight PE |
PREPREG is a common term for a reinforcing fabric such carbon which has been pre-impregnated with a resin system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is ready to be laid into the mold without the addition of any more resin. In order for the laminate to cure, an autoclave production process is used, a combination of high pressure and heat.
- Maximum strength and performance characterictics. In a hand layup production process, it is difficult to achieve 50% fabric and 50% resin content. Typical hand laminates, even when vacuum bagged, end up with a significant amount of excess resin. Excess resin increases brittleness and reduces overall strength properties. On the other hand, most prepregs contain around 35% resin. This is ideal for maximum cured properties and generally impossible to achieve in normal hand lamination.
- Uniformity and repeatability. The prepreg is of uniform thickness and each part coming out of the mold may theoretically be the same. Vacuum bagging technology may have some errors in processing, but prepreg ensures production consistency.
- Reduce curing time. After the thermal curing cycle, no need to wait for the standard 48 hours can be fully cured.
- Aesthetics. Although prepreg processing still requires mold preparation and demoulding, prepreg processing eliminates air bubbles, makes it easier to obtain a smooth, glossy surface as well as eliminates any seaming lines.
We offer free tracked shipping on all orders within mainland EU. Orders to remote areas such as Malta, Cyprus, and Iceland may incur a surcharge. Worldwide shipping is also available—please contact us for a quote.
Most orders dispatch within one business day (Monday to Friday). EU delivery takes 3–5 working days from dispatch, and tracking details will be provided via email once your order has shipped.
Please note that import taxes may apply outside the EU, and these are the responsibility of the buyer. Some items may ship directly from our suppliers and may have varying delivery times. If an item is out of stock, we will contact you to discuss the available options.
RETURNS
Changed your mind? You can return unused, uninstalled items in original packaging within 30 days of delivery. Return shipping is the customer’s responsibility unless the item is faulty.
Custom, used, or built-to-order items are non-returnable.
Once we receive and inspect your return, refunds are typically processed within 10 business days.
If your item is damaged or incorrect, contact us within 48 hours with photos and order details.
WARRANTY
All VA and VA Motorsports products come with a 1-year limited warranty covering manufacturing defects and fitment issues. For third-party items, warranty terms vary by brand—please check the product listing or contact us for details.
This warranty does not cover wear and tear, incorrect installation, cosmetic damage, labor, or third-party costs.
To start a claim, email us with your order number, issue description, and photos. If the claim is approved, we’ll offer a replacement, store credit, or a refund.
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