Since 1963, Carrillo is recognized as the preeminent custom connecting rod manufacturer in the world. Carrillo has provided custom and prototype connecting rods to virtually every major automotive and motorcycle venue, most notably to the high performance and speed equipment industry. Whether it is a development engine or a modified existing engine, when nothing but the finest, most accurate, proven part is needed, Carrillo has earned the reputation of simply being the best.

Carrillo has been working to improve the availability of our products to the entire motorsports industry. In an effort to allow more access to Carrillo’s unsurpassed attention to detail, exceptional processing, and proprietary materials, we increased our standard stocking inventory of parts.

In addition to our well known H beam connecting rod, we offer an A beam configuration as well. The A beam configuration is available in a Pro-A, Pro-A-Ltd and Pro-Super A (SA) and Heavy Duty configurations.

Typically, the Pro-A beam configuration is well suited for less demanding, more economical, high-performance, aftermarket applications. Pro-A-Ltd connecting rods are designed for limited and restricted motor applications. And the Carrillo Pro-Super-A (SA) bridges the gap between the Pro-H and Pro-A applications.

All versions of Pro-H and A are stocking parts, which are limited to the more popular dimensions and part numbers. To decide which beam type is best suited for your application, please call our Technical Sales staff. Together we can build a rod that is best suited for your application and needs.

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Carrillo uses proprietary chrome, nickel, moly, vanadium alloy which meets all VAR (vacuum arc re-melt ASTM standards). The heat is validated, both by the supplier and an independent metallurgist whom confirm the desired physical and chemical properties of steel.

All heat treat processes are via a mar-aged operation, resulting in UTS of 195,000 with a yield of 182,000 while maintaining the critical elements of low notch-sensitivity and ductility.

All Carrillo connecting rods are manufactured from an oversized forging resulting in the proper grainflow as well as the surface removal of any potential inclusions or surface conversions generated by the forging process. All critical CNC machines at Carrillo are equipped with probing to accurately validate dimensional integrity. In the production process each part is magnafluxed at least twice, further each piece is Rockwell tested to validate the heat treat procedure. A final shotpeen operation completes the part.

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Carrillo employs fasteners jointly designed by Carrillo. We employ two different materials: H-11 tool steel (220,000 UTS) as well as Multiphase TM (285,000 UTS). All our fasteners employ a patented thread design as well as the highest dimensional integrity in the industry. Each lot is sample tested destructively for both ultimate tensile strength as well as fatigue.

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.

Click to download a pdf of:
    Bolt Instructions 
    Bolt MSDS Sheets
    Introducing CP-Carrillo Fastener Assembly Lube

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Here are some of Carrillo’s popular features for the rod designs. However, if you have some unique feature in mind, please contact our Sales Technicians to inquire about how to get it incorporated into your rod design.

Annular Groves
A radial groove in the pin end bushing.
  Tapered Pin End
To reduce reciprocating mass or accommodate piston design, the pin end width could be tapered.
  PE and/or BE Lapped Finish
Instead of a standard finish, the pin end and big end thrust face are lapped to obtain a finer finish.
Grooves in Thrust Face
For weight reduction, grooves are machined on the big end thrust faces.
  Super Hone Finish
A mirror finish with less than 4 RA on the wristpin bore.
Double Locks
To provide flexibility for a rod with different bearing configurations or for rods that required double bearings.
Carrillo offers a variety of fasteners, in various sizes, including metric and materials such as H-11 steel (WMC) and multiphase (CARR).
Oil Reservoir on PE
A larger "funnel" at the top oil hole gives a better chance to collect oil for the PE lubrication. It is often combined with a PE bump out.

Lipped Cap and Lipped Cap Relief
When tension loads on connecting rods reach the higher limits of today’s automotive engines we have seen an improvement in the big-end integrity by slightly increasing the contact area between the cap and the connecting rod itself. Carrillo’s Lipped-Cap design achieves this goal with minimal additional weight. Because tension load is a product of stroke, piston weight and RPM, this feature is only necessary in very extreme applications.
FPO (force feed oiling)
Force Feed Oiling, or Forced Pin Oiling (FPO), in actuality does not offer forced or pressurized oiling. However, by installing a slot behind the bearing and a hole through the center of the rod we have established a reservoir that supplies oil underneath the wrist pin when the connecting rod is pulling mass down the cylinder. It certainly contributes to the longevity; however it is only effectual on one of the four strokes of the engine cycle.
Bushings and Split Bushing
Carrillo’s bushings are generally manufactured from Aluminum/ Silicon/ Bronze. As a custom connecting rod manufacturer we also offer a variety of other material such as Nickel/Tin/Copper and Beryllium Copper. In special and limited applications Carrillo offers the option to run rods without bushings. This option requires the use of a special coated pin. Please consult our technical sales engineers for application information.
Custom Laser Mark/ Serialization
Carrillo offers custom laser marking such as serialization, barcodes, text, including any TrueType font, alphanumeric serial numbers, date codes, logos, part numbers, graphics, and data matrix codes.
Ribbed PE
This feature has the H-Beam design extended around the PE-strap for increased stiffness / minimum PE distortion under inertia load. An option that is used for high engine speed applications.
Con Rod Materials
In addition to our standard proprietary blend of steel, Carrilloloy, Carrillo offers other connecting rod materials, such as Aluminum and Gen4. We constantly research and test potential materials to improve product offerings.
Arc Groove
The arc grooves guides oil from the 10&2 oil holes towards the 6 o'clock position of the PE. Since the grooves are running out before reaching the 5 & 7 o'clock position, the full bearing surface under compression load is effective.
BE Oil Squirters
This oil hole in the Big End neck allows pressure fed oil to squirt up to the piston and rod Pin End for additional cooling and improved lubrication. This option can be considered for engines without oil squirters.
Dowel Pin
The dowel pin is the alternative option to ring dowels for locating the rod cap. It allows the bolts to be positioned closer to the big end bore for improved big end stability. However, this design is less robust in assembly and disassembly than the standard ring dowel.
PE Radius
All Carrillo non-bushed rods are manufactured with a 0.020" radius as a standard. This option gives the opportunity to increase the radius if required for reduced edge loading.
Radius Slot
The radius slot represents the well-known and durable standard Carrillo H-Beam Rod design.
Square Slot
A reduced radius in the H-beam slot allows for additional weight saving with minimum compromise of rod rigidity. Ideal for applications that are critical on meeting a low target weight.
Tapered H-Beam
The strong H-beam configuration can handle extreme engine loads. The tapered beam allows for some weight saving on the reciprocation end and gives increased clearance for fully boxed pistons.
Straight H-Beam
The stoutest beam configuration available. It is capable of handling the most abusive forces in an engine.
A light weight rod design for high engine speeds and limited cylinder pressures.
Super A-Beam
With an increased beam thickness, the Super A-Beam design has a higher load capacity than the regular A-beam design.
Finite Element Analysis FEA
Computer generated stress analysis of con rods.

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Carrillo is often asked about general horsepower ratings for the various designs

of its connecting rods. Unfortunately, this cannot be answered in a simple way.
The most relevant rod design parameters are Inertia forces (a function of engine
speed, crank train geometry and assembly weights) and Cylinder firing pressure
(tuning, fuel, boost, etc.)
Through increased engine speed, displacement, firing pressure or a combination
thereof, horsepower is gained. However, though the various changes in the
cycle, the demand on the rods varies greatly. Moreover, extreme dynamic loads
on the drive train such as intermittently free spinning wheels or propellers (Hill
Climb races, Off-Shore boat races) should be considered the when making the
right choice of rod.
Based on our experience combined with our analysis methods we like to provide
you with our best suggestion for your specific application.