Classic Mini Engine Parts
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BMW Mini Cooper
Mini Cooper Connecting Rod Bolt Set Arp R50 R52 R53

Mini Cooper Connecting Rod Bolt Set Arp R50 R52 R53

Mini Cooper Connecting Rod Bolt Set Arp R50 R52 R53
Specially Priced Item
Part No: NME1077
Internet Price $82.95
A complete set of High Performance ARP Connecting Rod Bolts.


2002-2006 R50 MINI Cooper and R53 Cooper S Hatchback
2005-2008 R52 MINI Cooper and Cooper S Convertible

A Premium grade 8740 chrome moly steel is used to manufacture ARP High Performance connecting rod bolts. This material is heat-treated to provide a tensile strength in the 200,000 psi range, which is substantially stronger than the OEM bolts. Cycle testing show ARP High Performance rod bolts to be nearly five times more reliable than stock bolts.

Tech Notes:
Unquestionably the most important fasteners in any engine are the connecting rod bolts, as they hold the key to the entire rotating assembly. A broken bolt will leat to catastrophic engine failure. As you can imagine, the most critical joint is where the connecting rod halves mate.

The rod bolts must support the primary tension loads caused by each rotation (or cycle) of the crankshaft. When the crank rotates, the big end of the connecting rod essentially becomes oval shaped and the rod bolts bend. As the crankshaft continues to rotate, the rod becomes round again. With alternating tension loads and cyclic bending of the bolts, it is very important to install fasteners that are able to exert a clamping force greater than the load imposed upon the joint (tension).

In addition to utilizing a rod bolt with sufficient strength to withstand the tremendous cyclical strains placed upon it, it is absolutely imperative that the bolts be properly tightened. The preferred method of monitoring the correct amount of tension is through the use of a stretch gauge. This is far more accurate than using a torque wrench. Moreover, though subsequently checking the rod bolts length at teardowns, it is possible to determine if it has been stressed beyond safe limits and must be replaced.

TECH TIP: Measuring Rod Bolt Stretch
The most accurate method of obtaining the correct torque load on a connecting rod bolt is through measuring the amount of bolt stretch. This is preferred to using a torque wrench. See chart below for the appropriate amount to stretch a rod bolt over its relaxed state. ARP’s rod bolt stretch gauge can also be used to determine the condition of a rod bolt. If it has permanently stretched .001" or more, the bolt has been compromised beyond its yield. Replace it immediately!

Rod Bolt Stretch & Torque Specs

Stretch (inches): .0055" - .0060"
ARP Lube (ft/lbs): 25 ft/lbs

See all available ARP products here.

Related Technical Articles:
ARP Bolts & Fasteners
Created: January 28, 2006
Fastener Retention Overview There are three methods that can be employed to determine how much tension is exerted on a fastener; using a torque wrench, measuring the amount of stretch, and turning the fastener a pre-determined amount (torque angle). Of these methods, use of a stretch gauge is the most accurate.
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