CP-CARRILLO CATALOG

SECTION S-S Design & Engineering MATERIALS ALUMINUM PISTON ALLOYS 2618 ALLOY R1.225 R1.225 1.245 1.055 1.160 1.335

5.33 .210 2.46 .097 4.45 .175

Z

U The backbone of our aluminum connecting rods lies in the materials we use—specifically the 7000 series and CR509 aluminum. These materials are chosen for their unique properties that excel under extreme pressure, temperature, and load conditions. The choice between these materials depends on the specific application, ensuring that the rod’s performance is perfectly matched to the engine’s demands. 7000 Series Aluminum : Known for its high strength and excellent fatigue resistance, the 7000 series aluminum is ideal for applications where weight and durability are critical. This material is frequently used in racing disciplines that require high RPMs and substantial horsepower, such as Sport Compact and Blown Alcohol engines. CR509 Aluminum : CR509 takes aluminum rod strength to the next level. This proprietary alloy is specifically engineered for the most extreme racing conditions, making it the go-to choice for Top Fuel and Nitro Fueled engines where horsepower often exceeds 11,000. Its superior tensile strength allows it to withstand the incredible forces generated by engines in drag racing and other extreme motorsports. No two racing applications are the same, which is why we tailor our aluminum rods to suit a wide range of engines and power levels and set the benchmark for strength, precision, and reliability in high- performance racing engines. Whether it’s the explosive power of Top Fuel drag racing, or the high RPM demands of Sport Compact engines, our rods are engineered to meet and exceed the most extreme requirements. With H-11 bolts options in 3 / 8, 7 / 16, and 12mm sizes and designs formulated with the aid of FEA, our aluminum connecting rods are built to dominate the track.to meet and exceed the most extreme requirements. With H-11 bolts options in 3 / 8, 7 / 16, and 12mm sizes and designs formulated with the aid of FEA, our aluminum connecting rods are built to dominate the track . H ALUMINUM ROD ALLOYS In the high-stakes world of high-performance engines, choosing the right connecting rod material can mean the difference between victory and failure. CP-Carrillo’s aluminum connecting rods are designed to meet the most demanding applications, whether it’s the raw power of Top Fuel dragsters or the precision of Sport Compact engines. Our rods, made from the 7000 series and CR509 aluminum materials, are forged from proprietary alloys, 100% CNC machined, and formulated using Finite Element Analysis (FEA) for maximum strength and efficiency. MATERIAL INNOVATION: 7000 SERIES & CR509 I .492 MIN 21.59±0.025 10.80 .425 .850±.001 A C C C B B SECTION A-A EXHAUST 0.156 8° R0.830 SECTION H-H

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U One of the most significant advantages of 2618 alloys is its ability to retain its mechanical properties at elevated temperatures. In high-performance engines (turbocharged or supercharged), pistons can be exposed to intense heat. 2618 aluminum’s stability under these conditions helps prevent premature failure or warping, making it ideal for motorsports and high-power applications. 2618 alloy has a lower silicon content compared to other aluminum alloys, this allows for better absorption of impacts and stress, but it also means that 2618 pistons tend to expand more when heated. Therefore, these pistons require more clearance to accommodate thermal expansion. 4032 ALLOY 4032 aluminum alloy is another popular material used in piston manufacturing, particularly for applications that prioritize durability, wear resistance, and dimensional stability. It belongs to the 4000 series of aluminum alloys, which are characterized by a higher silicon content compared to other aluminum alloys like 2618. This high silicon level reduces the material’s expansion rate under heat, which allows tighter piston-to-wall clearances. This feature is particularly well suited for high-mileage applications or engines that require extended durability, such as street cars and mild performance builds. While 4032 is not as strong as 2618 aluminum, it still offers a good balance of strength and wear resistance, making it ideal for naturally aspirated engines or lower boost applications. Due to its lower expansion rate, 4032 pistons can be installed with tighter clearances, reducing piston slap (the noise produced when the piston rocks back and forth in the cylinder). While 4032 pistons might not handle the extreme stress of top-level racing engines like pistons made from 2618, they offer a balance for engines focused on consistent performance, reliability, and quiet operation in daily or moderately aggressive driving conditions. I 15.39 .606 3.18 .125 5.09 .200 20.17 .794 90° of aluminum alloys, primarily known for its superior mechanical properties and ability to withstand extreme conditions. 32 R1.260 6.86 .270 33.02 R1.300 33.02 R1.300 33.34 R1.313 67.69 33.85 1.333 30° 45° .355 ±.005 .090 ±.010 1.400 ±.010 .450 REF .962 .937 .100 ±.010 A A 32 32 .003 A .006 P.D. A A 11.81 .465 A E E 3.99 R.157 13.72 .540 8.13 .320 0.8660 0.891 The vast majority of our pistons are made from 2618 forgings, locally sourced in the USA. 2618 aluminum is a popular material used in high-performance pistons due to its strength and thermal properties. It is a high-strength, high-temperature alloy that belongs to the 2000 series H

0.120

.439 .430

61.47

2.420

D D

.430 ±.010

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