Quote:
Originally Posted by priobe
Wouldn't it be dependent on alot of factors rather than CI.
As example, camshaft spec, compression ratio, ported heads, valve size etc:
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Those factors would effect volumetric efficiency and airflow demand, so yes they have an impact, but probably more second order. It kind of already ties into the rpm demand, ie you couldn't have an engine that makes peak power at 7,000 rpm if it doesn't have good heads, cam, etc. The chart is intended as a ballpark. Some people are happy with engine configurations somewhat above or below this curve. I think it should be looked at as an indicator where if you have an engine which is stoutly built and you run chokes that plot to the left of the dashed curve, then you may have great off idle response, but you're most likely limiting your performance potential to a significant degree (and many in this category bad mouth webers for loosing steam at top end). Conversely, if you're running chokes that plot to the right of this curve, then you may be getting a few more HP at top end, but will generally have disproportionately poor low speed performance, including a much greater tendency for the legendary part throttle transition stumble (may not be important on a race car).