MZR 2.3 DISI Rods from cp-e™

[www.cp-e.com]

cp-e™ has chosen K1 as its manufacturer of choice for connecting rods. K1’s H-beam connecting rods are formed from billet 4340 steel. 4340 steel is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and high strength in the heat treated condition while retaining good fatigue strength. It is used for applications such as aircraft landing gear, power transmission gears and shafts, connecting rods, and other structural parts. The rods are shot peened for even more strength.

...more here

[Matrix311]

Great stuff! Any update on the big turbo kit? Your announcing rods, pistons, injector seals etc. Just waiting for the announcement of your big turbo kit.

[www.cp-e.com]

We are getting there.

All products go through extensive testing before they are confirmed for public use.

[06Speed6]

So how much power are these rods rated to? I have looked at them before, but I never could find what I thought was a reliable strength rating, just a general rating for all their import rods.

[www.cp-e.com]

The reason you cant find strength data is because rods will not get labeled for HP rating. Its over-revving that kills rods and failure of lubrication, bearings or pistons or improper install.

Here is a snippet from a Wiseco/K1 article about rods.

It's nearly impossible to put a power rating on a connecting rod. Power is produced from the expanding gasses in the combustion chamber pushing down on the piston which in turn pushes down on the connecting rods. While there are certain situations that could lead to failed rods due to compressive loads, rods generally do not fail due to power loads. If they did, they would experience severe bending to the point of permanent deformation prior to breaking. When you see a broken connecting rod where there is no seizure of the bearing or failure of the piston/pin/cylinder wall, look closely and you will see that the rod was actually pulled in two. This high tension pulling load on the rod takes place at TDC on the exhaust stroke and is caused by the piston trying to continue up the cylinder walls and through the cylinder head, and the crankshaft trying to pull it back down. The heavier the piston, longer the stroke and the higher the RPM, the more pulling load is placed on the rod. When you look at a Dyno sheet, you will see that as the RPM is taken past peak power the power falls off. However, most of us have seen engines that have had rods break when over revved. If power broke rods, they would never break due to being over revved.