Quote:
Originally Posted by serialk11r
hahaha okay I think we are on the same page. I was being pretty vague still sorry about that. When I was talking about pressure I was talking about pressure at the end of the expansion stroke, but anyways...
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Gotcha, meaning just before the exhaust stroke. A result and expected trade off when you have a peak cylinder pressure that is so much higher for so much longer than the same cylinder under NA conditions.
This is when you have to look at the pressure ratio of the two conditions and decide if you're making a fuel economy or performance engine. This is where you'll also view it from an efficiency point of view as you now have a ratio that you can compare between the two.
I'll take the trade off for power any day
I've come to find so many people say 'efficicency' is better in this or that but never specificy what efficiency. For instance, power desity or efficiecny of power per unit of displacement is better on the FI 2.0L making 400bhp than a 4.0L V8 making 400 hp. However the BSFC of the 4.0L NA is better....it all depends on what you're looking at
I'm going to see if I have anything at work that I can share about the break down of energy in an engine...ie things that won't get me fired for posting lol