You're right. You can also run a high CR with forced induction applications as well. Although, you really can't compare compression ratio and boost of one engine to a totally different engine that has a different bore and stroke.Originally Posted by Init2winit
Power comes from Fuel, air, compression, given spark at the right time. Compression ratio is math to help you determine the compression (pressure) you will have at TDC. As most people know to make the most power you are trying to stuff the most air/fuel you can in there at the highest compression your assembly will handle without detonation. In this case, a high quality forged rotating assembly can handle the higher CR and nitrous, it's all only up to a point though. Friction(which is heat) is another factor, this is where the detonation comes in... every enigne has its own dynamic compression ratio which is influenced by mechanical factors variables are adjusted in tuning to prevent detonation. There are so many factors and I can go on and on... and then the question... why do engine builders recomend LOWER CRs on boosted applications... and that is because you will have more options when it comes to matching up the compressions, the amount of boost, cam(s), head(s), intake, exhaust, timing, spark, squish or quench area, surface temps, air inlet temps, fuel, & fuel octane.
Whoa that kinda filled up quick... if you have any questions PM me.
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