Quote:
Originally Posted by Calum
Why does the famous K20 make such great NA power? It's because of the headflow and great combustion chambers.
The FA20 has been shown to have outstanding resistance to knock even at 12.5:1 compression, so the combustion chambers are certainly there.
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Problem is bottom end of the K20 is designed for higher revs, they've got 15% longer rods, and Honda only thought it safe to bring the K20 to 8600rpm. The FA20 loses on breathing capability because of this and because of the heads (likely not the best flowing), so it's gotta make it up with efficiency, and while it's got the latest combustion system design on its side, that's a lot of air it's missing out on.