WHAT IS CNC BLUEPRINTING?

"What Is CNC Engine Block Blueprinting?

For those currently exploring engine block choices, it is evident that a multitude of options are available, ranging from seasoned factory blocks to aftermarket counterparts. The selection between these two categories is reliant on the specific application. Nonetheless, a comprehensive grasp of the machining techniques employed is essential for making an informed choice that significantly impacts the ultimate quality of your end product.

Engine block blueprinting is a precise process for optimizing engine performance. It involves careful measurements, machining, and adjustments to ensure critical components are within specified tolerances and locations within the block. This results in improved engine performance and reliability, commonly used in high-performance and racing engines.

Typically, many shops employ the use of boring machines with a floating head, like the one pictured below. This type of Machine relies on a cushion of air for positioning. This head is initially positioned centered within the cylinder bore and then secured in place. While these machines are generally effective, they exhibit a notable limitation. Namely, they operate by aligning themselves with the pre-existing bore and cutting it oversize in the exact same location. This may raise the question of why this practice is problematic. Well, very simply put, these cylinder locations are incorrect from the factory. Yes, Maybe they are good enough for stock production vehicles, but not when you are trying to obtain maximum power and reliability from your engine. This is where the CNC operations come into play.

 

CNC (Computer Numerical Control) machines, equipped with digital probing tools, offer a distinctive advantage. The digital touch probe enables the determination of bore centers in relation to the crankshaft centerline. Now, a simple offset of the cylinder locations makes certain the new oversize bore is cut exactly where it belongs. A similar rationale applies to the angularity of the decks. Whether dealing with a factory block or a new aftermarket alternative, it becomes evident that the decks lack precision concerning their alignment with the mains and with the opposing bank. This too is easily rectified in the CNC machining operations.

A common misconception within the industry is that an aftermarket block arrives in a state ready for immediate assembly. This assumption, however, is false. Aftermarket blocks are typically supplied with undersized bores and unsquare decks that will both require machining. This all can easily be accomplished by a reputable machine shop, but is definitely worth considering, especially if budget is a factor.

Another Advantage to CNC machining of engine blocks is the ease of add-on features like, lifter bore correction, stroker clearance, block lightening, etc. All of the features can be completed by the touch of a button, in the same machine, saving you time, and money.