There are some avenues that might provide *some* information, but none will give you complete, detailed blueprints:
* Reverse Engineering: This involves taking apart an engine and meticulously documenting its components and assembly. This is a very time-consuming and expensive process, and even then, you'll likely miss crucial details about the design process and manufacturing tolerances. Furthermore, it's likely to infringe on patents if you then use that information to manufacture engines.
* Technical Manuals and Service Manuals: These manuals provide detailed information about the engine's operation, maintenance, and repair, but they won't contain the full design blueprints.
* Academic Research: Some universities and research institutions might conduct research on engine design, and you might be able to access some publications based on their work. However, this information will be generalized, not specific to a particular car engine's blueprints.
* Patents: Manufacturers often file patents related to specific engine components or technologies. You can access these patents through patent databases like the USPTO (United States Patent and Trademark Office), but they won't provide complete blueprints, only specific details of patented elements.
In short, accessing the complete blueprints of a car engine is highly unlikely and illegal without the explicit permission of the manufacturer. The information available through other means is limited and incomplete.