[quote name='flash' date='Nov 28 2005, 11:38 AM']balancing an engine entails carefully weighing each component of the reciprocating mass and then adjusting the weights of each item so as to insure equality of them - it generally means shaving some material off or driling some holes to remove material - this process makes for a more free revving engine, and generally increases the capacity for sustained higher revs
blueprinting is essentially a process of hand assembling, fitting, and checking each and every component, insuring perfect fit, alignment, straightness, specification, and tolerance of each of the components so they have maximum possible match to insure optimum power and longevity
it is a very time consuming and tedious process, abnd one that does not come cheaply, but one that results in a much better and stronger running engine - this is not something done by the manufacturer, at least not to the level that a race engine would be - the manufacturer has much looser tolerances and restrictions, creating a nominal acceptable condition that they can easily repeat in quantity - this process goes much farther in achieving maximum power
that is why different stock engines output different levels of power - one may do 220hp, and another 240hp, purely as a result of this process and how close the component matching and assembly was to the optimum
i highly recommend this process to anybody contemplating building an engine
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Agree with all of the above! In point of fact, the B/B of the engine resulted in (almost) negating the frictional losses from the powertrain-the engine's rated horsepower at the flywheel is 236. The same engine builder replicated the same bhp and torque numbers on Donna Amico's yellow 968 racer as with the #69 car-as both vehicles have similarly prepped engines. There's not much else to do-and stay within the PCA rules-to the motor to garner much more power.
Gary
