Quote:
Originally Posted by x-bird
reason I brought it up, when you;re dealing with altitude, more cubes is not the way to go, increasing volumetric efficiency is the ticket. That's why the big V-8s don't do as well as the blown 4s and 6s at pikes peak. Just not enough air to feed them naturally.
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This is true, naturally aspired engines lose about 3% for every 1000 feet you go up in altitude. But the bigger motor will still have more hp then the turbo'd motor in this case. At the same altitude. This is only because this motor is twice the power of the other. If you are talking identical motors then turbo is the only way to go.