| [GMCnet] Blueprinting an Internal Combustion Engine [message #281262] |
Thu, 02 July 2015 09:29  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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I've heard this term bounced around a few times over the years here. And it's a subject that is not well understood overall . It's the process of making EVERY factory dimension perfect. It's expensive, and time consuming. I'll give you some examples. Because I don't want to make this e-mail into a paperback novel. When our engine came from GM. There is what's called the deck height. That's the distance from the center line of the crankshaft to the height of the block were the heads are bolted too. With mass produced engines. This height will always be on the positive side. Too short. The piston could end up running into the cylinder heads. This positive dimension will be in the range of .005 to .020. Depending on engine design, and material used in the block. Blueprinting that dimension will put it to perfect factory specs. That is when the four corners. And all surfaces between will be the same. On our V8's, that also means that both deck heights will be perfect to e
ach other. As to the crankshaft itself. The rod journals aren't always turned to their proper timing to all the other rod journals for proper top dead center timing. This means that the rod journals must be ground to their proper positions on the crankshaft. All four rod journals in our case.The heads. One examples here. CC'ing the heads. This means that all combustion chambers are made to have the same volume in CC's.These three examples are just the tip of the iceberg. So if you hear someone say that their engine was blueprinted. Ask for some details. You will probable not get much of a response back. Because for what it cost. And them seeing the bill. They would know the details.Engine work is time consuming, thus expensive. John, and Teresa are getting off cheap. Their just paying for the parts. I will balance it.
Bob Dunahugh Member GMCMI
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