What is the EC Pinnacle 3.600" connecting rod?
The EC Pinnacle 3.600" connecting rod is a purpose-built performance rod designed specifically for Wildcat 240RS and 240RX racing engines.
It is engineered to work with the Wildcat 59mm crankshaft and EC WC-200 72mm forged piston, creating a matched rotating assembly for high-performance Wildcat 240 engine builds.
What Wildcat engines does the EC Pinnacle 3.600" rod fit?
The rod is designed specifically for the:
- Wildcat 240RS
- Wildcat 240RX
- Compatible Wildcat 240 racing blocks
It is intended for use with the Wildcat 59mm crankshaft and EC WC-200 72mm forged piston.
What piston should I use with the EC Pinnacle 3.600" rod?
The EC Pinnacle 3.600" rod is designed specifically for the EC WC-200 72mm forged piston.
The piston uses a 13mm wrist pin and has the compression height required for this rod and crankshaft combination.
Will the EC Pinnacle rod work with a Tillotson 72mm piston?
No. The standard Tillotson 72mm piston has a different compression height than the EC WC-200 piston. Using the Tillotson 72mm piston with the EC Pinnacle 3.600" rod can result in excessive piston pop-up and potentially cause piston-to-head or other clearance problems. Do not substitute a different 72mm piston without verifying compression height and all required clearances.
What crankshaft is the EC Pinnacle 3.600" rod designed for?
The rod is specifically designed for the Wildcat 59mm crankshaft.
The 59mm stroke, 3.600" rod length, EC 72mm piston compression height, and Wildcat 240 block deck height are designed to work together as a matched combination.
Is the EC Pinnacle 3.600" rod a universal Honda Clone connecting rod?
No. Although the big-end crankpin uses the 1.180" Honda/Clone crankpin standard, the EC Pinnacle rod is not a universal replacement for Honda GX200, Predator, Tillotson, Ducar, or other Clone engines. The rod's length and geometry are specifically designed around the Wildcat 240 block, 59mm crankshaft, and EC 72mm piston.
What is the rod length?
The EC Pinnacle connecting rod is: 3.600 inches center-to-center. The length is specifically selected for the Wildcat 240 / 59mm crankshaft / EC 72mm piston combination.
Why is the 3.600" rod length important?
Rod length is an important part of an engine's rotating geometry.
The 3.600" rod works with the 59mm stroke and EC 72mm piston compression height to establish the intended piston position within the Wildcat 240 cylinder. Changing the rod length or substituting a different piston or crankshaft can significantly change deck height and engine geometry.
What is the EC Pinnacle rod made from?
The rod is manufactured from billet aluminum for a lightweight, high-strength design intended for demanding high-RPM racing applications.
How much does the EC Pinnacle 3.600" rod weigh?
The rod weighs approximately: 155 grams including bolts and bearings. The lightweight construction helps reduce reciprocating and rotating mass for improved engine response.
What is the big-end crankpin size?
The big end is designed around the: 1.180" Honda/Clone crankpin standard.
This does not make the rod universally compatible with all Honda Clone engines because rod length, piston compression height, block deck height, and other dimensions must also match.
What size wrist pin does the EC Pinnacle rod use?
The small end is designed for a: 13mm piston wrist pin.
It is designed specifically around the 13mm wrist pin used with the EC WC-200 72mm forged piston.
What is the EC Pinnacle rod bolt torque?
The recommended rod bolt torque is:
150 in-lbs.
Use a calibrated torque wrench and follow the appropriate assembly procedure for rod bolt lubrication and installation.
Does the EC Pinnacle rod come with rod bolts and bearings?
The listed rod weight of approximately 155 grams includes the rod bolts and bearings.
Verify the current product packaging and listing for the exact components included with your purchase.
Is the EC Pinnacle 3.600" rod designed for racing?
Yes. The rod is specifically designed for high-RPM Wildcat 240 racing applications.
It is particularly suited to:
- Kart racing
- Wildcat 240RX engines
- Wildcat 240RS engines
- Full-race engine builds
- High-performance stroker combinations
- Competition engine development
Can I use the EC Pinnacle rod in a stock Wildcat 240 engine?
The rod is designed around the Wildcat 59mm crankshaft and EC WC-200 72mm forged piston combination, rather than as a stock replacement rod.
If building a stock or near-stock engine, verify that the complete rotating assembly is compatible before using this rod.
Does the EC Pinnacle rod increase horsepower?
The connecting rod itself is not a direct horsepower-producing component. Its purpose is to provide the correct strength, weight, and geometry for the Wildcat 240 stroker combination. The lightweight design can reduce reciprocating mass and improve engine response, while the correct rod geometry allows the 59mm crankshaft and EC 72mm piston to work together properly.
Does the 3.600" rod change piston deck height?
Yes. Rod length is one of several factors that determines piston deck height.
Final deck height is determined by the combination of:
- Block deck height
- Crankshaft stroke
- Connecting rod length
- Piston compression height
- Head gasket thickness
Always measure actual piston-to-deck clearance during engine assembly.
Does the EC Pinnacle rod require checking piston-to-head clearance?
Yes. Piston-to-head clearance should always be measured during final engine assembly. Do not rely solely on calculated dimensions because manufacturing tolerances and variations between components can affect actual clearance.
What clearances should be checked when installing the rod?
Before final assembly, verify:
- Piston-to-deck clearance
- Piston-to-head clearance
- Valve-to-piston clearance
- Rod-to-cylinder clearance
- Rod-to-cam clearance
- Piston skirt clearance
- Crankshaft endplay
- Wrist pin fit
- Connecting rod bearing clearance
These checks are particularly important in high-RPM racing engines.
Can I use a different 72mm piston with this connecting rod?
Only if the replacement piston has the correct compression height, wrist pin diameter, and overall dimensions for the Wildcat 240 / 59mm crankshaft combination. The EC Pinnacle rod is specifically designed for the EC WC-200 piston, so substituting another piston requires complete dimensional verification.
Why can't I use the stock Tillotson 72mm piston?
The issue is not the 72mm bore diameter. The important difference is the piston's compression height. The stock Tillotson 72mm piston positions the wrist pin and piston crown differently than the EC WC-200 piston. With the 3.600" rod, that difference can cause excessive piston pop-up and create clearance problems.
Can the EC Pinnacle rod be used with a different crankshaft?
The rod is specifically designed around the Wildcat 59mm crankshaft.
Changing the crankshaft stroke changes piston position and engine geometry. Any alternate crankshaft combination should be fully calculated and physically checked before assembly.
Is the EC Pinnacle rod suitable for high-RPM engines?
Yes. The rod is designed specifically for high-RPM Wildcat 240 racing applications and uses lightweight forged billet aluminum construction.
As with any racing engine component, proper assembly, bearing clearance, lubrication, balancing, and inspection are critical to reliable high-RPM operation.
What is the complete rotating assembly combination for this rod?
The intended combination is: Wildcat 240 block + Wildcat 59mm crankshaft + EC Pinnacle 3.600" rod + EC WC-200 72mm forged piston
This combination is the foundation of the intended Wildcat 240 high-performance stroker build.
Is the EC Pinnacle rod compatible with Predator engines?
No, not as a direct-fit application. The rod is specifically designed for the Wildcat 240 platform. Even though the big-end crankpin is based on the 1.180" Honda/Clone standard, the rod's length and geometry are not intended for standard Predator engine blocks.
Is the EC Pinnacle rod compatible with Honda GX200 engines?
No, not as a direct-fit replacement. The EC Pinnacle 3.600" rod is specifically engineered for the Wildcat 240 block and 59mm crankshaft combination.
Is the EC Pinnacle rod compatible with Ducar or Tillotson engines?
It should not be considered a direct-fit rod for Ducar or Tillotson engines. The rod is purpose-built for the Wildcat 240 platform and its taller deck height.
What is the most important thing to verify during assembly?
Measure the actual piston deck height and all required clearances. Do not assume that calculated dimensions will exactly match the assembled engine.
The piston, rod, crankshaft, block, cylinder, head, and gasket combination should be measured and checked before final assembly.
Who is the EC Pinnacle 3.600" rod designed for?
The EC Pinnacle rod is designed for engine builders who are developing high-performance Wildcat 240RS and 240RX racing engines, particularly those using the EC 72mm forged piston and Wildcat 59mm crankshaft. It is a purpose-built component for builders looking to develop a serious Wildcat 240 stroker and full-race engine combination.
