The selection process between both I-Beam & H-beam design is usually decided upon the weight, buckling strength & production costs for the conrods. We have designed & made conrods for Fits Nissan RB,SR,VQ, Mitsubishi 4G, EJ & also for Toyota 3S, 1J & 2J engines. We chose to aim for overall strength while maintaining a light weight design.

When the rigidness is insufficient enough at the large end, the metal housing can deform, which can cause metal burns. In order to guarantee overall strength where the rod is connected, the large end was made smoother and the “shoulder form shaped” was adopted.

If the thrust aspect of the connecting rods large end is designed as a simple circle, the conrods side will cause irregular wear on the cranks thrust aspect area and thus shortening the life of the crankshaft.

The TOMEI conrods thrust protector is designed to come into contact with the entire contact surface area rather that just the thrust aspect of the crank.

The oil cap bush now has 2 holes for oil to enter for lubrication.

This bush experiences high load whilst providing oil hole from the top of the bar when the upper piston pin is pressed down when the conrod rises. Unlike other aftermarket conrod designs our H-Beam conrod design does not have the oil feed in the center of the rod from the big end. This way the center is solid for maximum strength.

ARP L19 rod bolts were selected for our applications due to the superior strength and fatigue properties. A special thinner frame was designed with minimal burden on the threads. The threads was cut into the connecting rod side since no nuts are used which helps with weight reduction. This design promotes strength while benefiting with weight reductions. L19 is the top range type of ARP rod bolts used since it’s a much higher strength material compared to the ARP2000 and is capable of delivering the highest clamp loads possible.

The SNCM439 material is normally used only when considerably high rigidity is required. High strength conditions are key elements for the conrod for supporting a highly efficient turbocharged engine. Nickel was also added for extra tension resistance.

To help prevent burns where the metal connects to one another a nock sleeve is inserted in the bolthole to help reduce any gaps between the face of rod side and the cap side. This maintains a more secured fitment.

The lightest weight possible without compromising the conrods strength for high power use.

The ARP Molybdenum grease is highly resistant against heat and pressure, enabling a accurate torque figure when tightening the fastener.