Editing Engine tuning (section)

===Blueprinting===
{{Unreferenced section|date=December 2018}}
[[Blueprint]]ing an engine means to build it to exact design specifications, limits and tolerances created by its OEM engineers.

In spite of that definition, the term is often colloquially used for pursuing better-than-factory tolerances and performance, possibly with custom specifications (as for racing). 

Common goals include engine re-manufacturing to achieve the rated power for its manufacturer's design, and rebuilding an engine to optimize its performance by adhering to or exceeding exacting manufacturer specifications. Blueprinted components allow for a more exact [[Engine balance|balancing of reciprocating parts]] and rotating assemblies so less power is lost through excessive engine vibrations and other mechanical inefficiencies.

When feasible, as with a factory-sponsored race team, blueprinting is performed on components removed from the production line before normal balancing and finishing. Over-machined, under-cast, and deficiently manufactured parts are rejected, and only those either exactly meeting specifications or allowing removal of excess material are selected.  Aftermarket and private parties must work with  what they have or seek suitable replacements that can be brought to spec, following the same guidelines.