Quote:
Originally Posted by Chance
Higher compression ratio can certainly improve fuel economy, which is why everyone has been trying to do that for so long. What I'm really curious about is how "state-of-the-art" the new V8 that replaces the V10 will be.
If we look at the very newest Ford naturally-aspirated engines tuned for pickups (the F-150s), they have 12:1 compression ratio, which is way higher than the 9.2:1 of the V10. They also have 4-valve DOHC, variable valve timing, direct injection plus port injection, and so on. All this yields 80 lb-ft of torque per liter, and a lot of HP per liter too.
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All three of my Spyders put a 12:1 or better squeeze on the mix... and they needed to run 91 octane fuel.
Yes: modern electronics can compensate, when you feed them 87... but that can compromise fuel economy and power.
Leaving you right back where you started.
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