Originally Posted by QBNKID
Ryan, I know he is talking about the displacement as I mentioned to him above. I just want to know where the 40 hp extra comes from the extra 25 cubes. How do you guys come up with 40? Fill me in...
GENERALLY SPEAKING, Displacement via boring or stroking increases power proportionally . X amount of displacement can yield up to Y amount of power. This magical number is typically around 1.5 HP per cube or so. Again, I stress that I'm being very general and not very specific.
Assuming same compression, cam profile, heads, etc etc. the 6.1 will only be about 40 crank hp ahead of a similiarly equipped 5.7. The 6.1 makes more power out of the box in comparison to the 5.7 because it was set up to do so- the cam profile is slightly more aggressive, the heads are cast differently, the PCM cal is more aggressive, etc. Build each motor with the same heads, same cam, same compression, etc, and the difference between the two respective motors will diminish.