What Is Ultimate Duty?
Manufactured exclusively for MAPerformance by Howards Racing Components we developed these connecting rods to fulfill the needs of the hardcore enthusiast. Designed to handle 1000+ horsepower in a 4 cylinder application these truly are ultimate duty connecting rods!
Why 156mm Long Rods?
These connecting rods can be used in three separate configurations to yield an improved rod ratio for the most demanding high RPM applications:
- Long Rod 2.0L (Utilizes 88mm Crank, 2.0L Block, and Stroker Pistons)
- 2.1L (Utilizes 88mm Crank, 2.4L Block, and 2.4L Pistons)
- Long Rod 2.4L (Utilizes 100mm Crank, 2.4L Block, and Custom Big Bore Stroker Pistons)
Research & Development
The research phase for these connecting rods consisted of a process called Finite Element Analysis which helped us to determine the weakest points of the factory connecting rod design. Using that information we developed a prototype using state-of-the-art CNC equipment that included the finest high nickel AQ4340 billet steel material, Ampco 18 bronze wristpin bushings, Manton alignment sleeves, and massive 7/16″ ARP 2000 series fasteners. In the final development phase the prototype was heat treated, fully stress relieved, and shot peened to ensure that no stress risers or surface imperfections remain. The end result: A 652 gram connecting rod that we feel is the strongest and most reliable steel connecting rod available on the market for this application.
Important Note: In order to increase bearing surface area and load capacity these connecting rods utilize rod bearings from the 1990-1992.5 6 bolt 4g63 (ACL Part # 4B1146H).
Optionally we can apply an oil shedding thermal dispersant coating to your rods. This coating will speed up heat transfer from the rod to the oil then shed it quickly to allow fresh, cooler oil to come into contact with the rod. This will improve heat related stress issues associated with high performance, high revving, motors. A ‘must have’ for those wanting the highest confidence in their builds.
Modern Automotive Performance
9905 13th Ave N.
Plymouth, MN 55441
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