I hear ppl talk about balancing and blueprinted engines. What does this exactly mean? What do u balance and what gets blueprinted?

 

bump

 

It's when the engine is taken apart and everything is port matched. The crank is balanced perfectly etc. Correct me if I'm wrong.

 

The blueprinting I believe is when everything is put back to factory spec or something isn't it?

 

Yup like he said.

See when you buy all the "best" parts, you throw them together and they won't work. It's not like doing bolt ons when your tolerances are so close. So what machinest's do is they put it all together, spin the hell outta it and trim and weigh parts so everything is in sync.

Imagine a washing machine on spin cycle... if all the clothes are on one side it'll stop and you have to balance the load... the same is for the parts inside your motor!

 

yeah thats a good explanation bolsen. As far as the blueprinting they just match the ports up so there is an even airflow with out extra metal getting in the way. Basically makeing sure that the 2 holes line up correctly.

 

Just going through this process can add a lot of extra horse power.

 

I dont know about that Evo007, I will find out when my engine is done being built.

 

Depends how off everything was to start with. You could end up with 5hp or 20hp gain from it depending I would think.

 

I shall find out.

 

remember kids, the dead honest truth about building motors, is you get what you pay for.

 

Technically, balancing and blueprinting are different processes. Balancing is a somewhat involved process of weight matching the moving or reciprocating parts in a short block. When done correctly pistons with wrist pins and rings are weight balanced to the lightest piston. Rods are balanced at both ends and then weight matched to the one with the least weight. These reciprocating masses are thus matched. The crank is then balanced with bob weights which are a percentage of the actual rod plus piston weight (differs by manufacturer and engine design). Occasionally, the flywheel, clutch, harmonic dampner and crank shaft are assembled and balanced as a complete rotating assembly. Again, it all depends on the engine design and whether the crank boltons are zero balanced. Some might call knife edging the counter weights a part of blueprinting the crank. Nitride treatment of the crank would also fall into this category.

The origin of blueprinting was to take all relevant tolerances out or in to the maximum or minimum allowed (as in the design blueprints). This was originally done most commonly in stock classes where all parts had to be stock in both material and dimension. This process made some "stock" engines much stronger than others. Today, blueprinting has degraded to mean that extra care is given to proper internal tolerances and assembly preparation. In some applications the piston to cylinder wall clearance should be tight and in others more power is to be had with them loose. Today, we don't tend to make "super" stock engines by the judicious maximizing and minimizing of dimensions. In many cases the factory dimensions are already optimized. However, the best engine builders often do know where performance advantages can be had. Alternatively, they may have inside knowledge of stock failure items and how to avoid these failures when the stock equipment is exposed to high boost or high RPM as in the case of the Evo engine.

Blueprinting is often used to describe head work. As such it is an old fashioned term for port matching, flow bench porting, blending, polishing, unshrouding, multi angle valve jobs, installing high performance valves, retainers and springs, not to mention the installation of oversized valves that are parts of high performance head work.

 

http://www.hastingsmfg.com/Service%2...ueprinting.htm check this link-it explains everything.