Has anyone ever seen a mfg that produces cracked rods for our cars? I know there are a lot of great rods out on the market but there all (the ones I've found) two piece forged that need to be matched. A single piece forged rod that is cracked generally gives you a superior rod.

 

alright i have stared at this post for a few minutes......

Hmmmm, I had to look that one up:

High strength cracked connecting rods are used that minimize weight and size, while also increasing connecting rod rigidity and long term durability. A "cracked" connecting means that the rod and cap are forged as a complete unit during the manufacturing process, and then cracked apart to create a custom fit between the two matching surfaces. The use of high strength steel contributes to the connecting rod's slender shape and results in a 50 percent increase in fatigue resistance for a long lasting engine.

The design allows for the elimination of connecting rod bolt pins, since the connecting rod bolts can be precision machined to fit the cap to the rod. The end result is a connecting rod that is 13 percent lighter and has a 20 percent smaller cross section, resulting in less rotating mass inside the engine and less space occupied by the connecting rod - a significant component to creating a powerful, efficient and compact engine.

 

"Forged" rods are not cracked. Powder metal (PM) rods are. The metal grain structure in a PM rod (or really, lack thereof) is what allows them to "crack" them.

I've never seen a PM rod in a performance application. They make great OE production rods in mass manufacturing and can be made quite strong. But they are not the same as a forged rod.

 

Why when i can get a rod like manleys that will hold over 800 ponies

Cracked rods are used widely in the diesel arena

 

I stand corrected. I did find where the GM Duramax has forged and cracked rods.

Still, I think you'd be hard pressed to find a forged cracked rods in the aftermarket segment.