VR38DETT…the power plant of the new GTR. World renowned for being the most formidable V6 built to date and is giving the super cars of our day a big run for their money. Its with no surprise that Nissan pulled back the books and really dove into the design and pushed the envelope to produce such a fantastic engine.

But like all engines, they do fail under unfavorable circumstances. So necessity leads way to producing bigger and better aftermarket components. Fast forward to some newer applications for the GTRs power plant and you see a plethora of newer rotating assemblies and advancements in engine components.

Recently I received one of these newer GTR engines that had an unfortunate outcome. This particular VR had an internal falling out of sorts and completely and uttlery came to a halt. In the racing world we call this engine vomit when the internals of the engine literally grenade themselves into a pile of rubbish at the bottom of the oil pan. For us in the engine machining and building world we cringe when we see things like this.

Engine arrived for rehabilitation

So where do we go from here? Well quite simple really, we build from the ground up of course. Using a brand new block from Nissan and some aftermarket components this setup will surely give way to some interesting power output. With a judgement call by my customer to use a premium rotating assembly on the market by GTC Race Technology we have a solid foundation of beginning a new engine program here at EPR. Coupled with the new GTC Rotating assembly (4.1L) outfit we are also pairing this assembly with CP pistons. A true race inspired combination is going together. Information regarding GTCs rotating assembly is:

VR Crankshaft & Conrods

GT-R EN40B CRANKSHAFT

Made from the finest, aerospace grade EN40B steel billet material. CNC machined on state of the art, 5 axis Mazak Integrex 300-IV CNC machines to exacting tolerances (.0001″). Every crankshaft features large radius journals that add rigidity for high horsepower, high boost, high rpm applications. Gun drilled, CNC ground oil holes feature a smooth surface for extra oiling, tear dropped for added oil scoop, cross drilled for priority main feeding to the rods and micro polished to a mirror finish for optimum bearing lubricity. All cranks are stress relieved, shot peened, magna flux inspected and nitrided (multi step heat treatment) for ultimate performance. Fully profiled counterweights are designed for reduced windage through the crankcase creating less oil resistance for better rpm potential.

National defence level EN40B material, double melt for reliable super strength.
Round All counterweight edges
Enlarged centre counterweights
Teardrop oil hole chamfer on both main and rod journals – improving lubricant flow in & out
5 Axis machined centre drilled oil holes gallery, providing all accurate angle and across each other. The high rpm drilling job providing super smooth oil hole inner surface supporting lubrication.
V-Style drilled lightening holes, removing material but keeping pin strength.
Precision grinned journals. Followed by mico-polishing after nitriding
Special surface treatment for overall crank, removing all sharp edge and blur.

R35 GT-R CONNECTING RODS

100% premium AISI4340 chromoly steel
strict forge and heat treatment processed forgings, hardness of 35-42 HR C.
Aluminium/Silicon/Bronz alloy bushing
3D software re-designed critical C-bore area, special CNC machining ensure smooth commection and free of sharp edge, significantly improved strength
Standard equipped with the best ARP Cust. Age 625+ bolts (260,000PSI)
Accurate sized and edge chamfered dowel sleeve for easy and accurate re-assembling.
Sunnen hone solution for all big bore and pin bore finishing.
Enlarged mating surface increase mating area strength significantly, and grinded mating surface makes re-assembling job accurate and easy.
Thread-end is blinded to same length as bolt
Radial grooved bushing crates an oil reservoir within PE improving pin lubrication.
Cap is designed thicker than beam to increase strength.
Special designed EP hole, establish arch form to undertake loading from BE.
Ribbed PE is standard feature to minimum PE distortion under interia load.
The oil groove on the big end surface is the standard feature.