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CP-Carrillo Connecting Rods

The Choice Connection: CP-Carrillo Forged Connecting Rods for Porsche Engines

Carrillo connecting rods have been used and trusted by top Porsche engine builders for decades over stock connecting rods for performance street and track builds. Although stock Porsche connecting rods can be rebuilt and upgraded with ARP rod bolts, upgrading to Carrillo connecting rods for Porsche engines that will rev over 7400 rpm, make over 400 horsepower, or for engines that will see track use is a much better choice for a performance build. LN Engineering stocks forged Carrillo connecting rods for aircooled Porsche 356 and 911 engines and for watercooled Porsche Boxster, Cayman, and 911 engines featuring Carrillo's lightweight h-beam connecting rod design that provides many benefits including reduced reciprocating mass to make your engine more responsive with increased strength and durability. Most Porsche Carrillo connecting rods are designed to be a drop in upgrade for the original equipment Porsche connecting rod.

LN Engineering offers custom Carrillo connecting rods for Porsche Boxster, Cayman, and 911 M96/M97 engines approved for PCA Club Racing in Spec Boxster, 996, and Cayman classes sized to our specifications for use with our CT-1 coated race rod bearings. Carrillo connecting rods can be special ordered for all aircooled and watercooled Porsche engines in custom lengths, with different wrist pin sizes, or even made out of titanium to further reduce reciprocating mass.

CP-Carrillo connecting rods for aircooled and watercooled Porsche engines are fully machined from Carrillo's proprietary 4330m chromoly steel for strength and durability far superior to original factory Porsche connecting rods. Carrillo connecting rods are available with 2 types of connecting rod bolts: WMC and CARR. The standard WMC-H7 (H11 Tool Steel) connecting rod bolt used in Carrillo connecting rods have an UTS (ultimate tensile strength) of 220 k psi where the upgraded CARR-S7 (MP35N) bolt with a UTS of 285k psi. All Carrillo WMC and Carr rod bolts are manufactured with asymmetrical threads, giving the bolts an evenly distributed thread engagement that helps increase the clamp load and improve the fatigue life of the fastener. Both WMC and CARR bolts typically can be reused during rebuild and do not have to be replaced as long as the engine has not been over-revved. We recommend the WMC bolt for most applications however the upgraded CARR connecting rod bolt is a good choice if the engine will rev over 8500 rpm. CARR rod bolts are standard on all Carrillo connecting rods for Porsche 356 and 912 engines.

 

Carrillo Connecting Rod Bearing and Wrist Pin Clearances

Bearing clearances are dictated primarily by the bearing, not by the housing bore of the Carrillo connecting rods. The Carrillo connecting rod bore determines crush. Bearing clearances vary as to the application, diameter of the journal, and bearing design. Approximate clearance in lieu of factory Porsche specifications (which should always be followed) would be .001 per 1.000” diameter of crankshaft pin measured at the crown of the bearing surface. Wrist pin to bushing clearance is variable per diameter as well. Wrist pin diameters .500" to .750" should run .001" pin clearance (max .0016"); wrist pin diameter .751" to 1.094" should run .0012" pin clearance (max .002").

 

Carrillo Connecting Rod Guarantee

Technological advances are constantly made in the high performance engine business; many components that are adequate today will be outdated and unacceptable tomorrow. For this reason, CP-Carrillo is continually testing their products to assure our customers that we can offer the highest quality products. CP-Carrillo’s enviable reputation in the industry has led competitors throughout the world to copy their h-beam design. As such, watch for counterfeits. These imitation connecting rods do not employ Carrillo's sophisticated methods of certification and inspection. Consequently, these connecting rods cannot approach the high quality component that CP-Carrillo produces. CP-Carrillo's obligation to the high performance engine business is that only the finest quality materials, workmanship and inspection procedures are documented and accepted. This is their guarantee to you, our customer, that every CP-Carrillo connecting rod will exceed the requirements for your aircooled or watercooled Porsche performance engine rebuild.

 

Carrillo Connecting Rod Assembly

The CARRILLO connecting rod is a precision, high strength, quality connecting rod, which when properly installed and maintained, will perform flawlessly in today’s racing and high performance internal combustion engines. We would like to offer some suggestions and specifications that should be helpful in your installation.

Prior to disassembly of your Carrillo connecting rod, number the connecting rod and matching cap. DO NOT use a metal stamp to mark your Carrillo Connecting Rods!

Every CP-Carrillo connecting rod is supplied with specific assembly lubricant to be used. All WMC and CARR bolts should be lubricated under the heads as well as on the threads. Spread an adequate amount of the paste on the threads and under-head. Paste must not be mixed with grease or oils. We recommend that the included connecting rod bolt lube is used, or as an alternative, molybdenum base paste mixed with engine oil. The preferred method to torque the bolt is by using the stretch figure. In order to check bolt stretch, simply fixture one rod, leaving the cap portion free from clamping load. Measure both bolt lengths loose, and then progressively tighten the bolt until the measured increase in length correlates with the listed stretch and torque figures provided by CP-Carrillo below.

CP-Carrillo Connecting Rod Bolt Stretch and Torque Values

Assemble cap to beam, slightly tightening the bolt by hand and simultaneously assuring that the large chamfer on the rod faces the crankshaft cheek. The final torque should be completed in one full motion. Use the indicated torque reading to tighten all the connecting rods in final assembly. We advise AGAINST using an impact gun to start rod bolts and please use caution not to cross threads when installing the connecting rod bolts.

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