Quote:
Originally Posted by infinite_kaos
Now, I was talking with a fellow DSMer today and mentioned the 2.4 build, he said that he wouldn't go that route due to personal choice, and that with the stroked motor the piston speed is gonna be much higher then the piston speed on 2.0. So if you were to rev your engine to 7k rpm, the piston speed would be somewhere up in the 9krpm range.
Is this true, also that the powerband would be smaller, since most of your power wouldn't come until 4k rpm, then if you're redline is 7k rpm you powerband is only 3k rpms which isn't worth it, and you would only benefit from a small turbo.
Any word on this, I've seen guys running some really good numbers on their 2.4's. Maybe he's thinking something different?
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He's thinking about the rate of acceleration of the piston as it arrives and leaves TDC or BDC. And that rate is directly related to rod:stroke ratio.
The destroked 4G64 2.1L long rod achieves the best rod to stroke ratio which is why it revs so high safely. After that, the factory stroked 4G63 is second best, and factory stroked 4G64 is third. BUT, just because it's in 3rd place of the 3 doesn't mean it's bad at all. The 4G64 will rev efficiently AND safely to the factory red line or a little further. After 8k the VE is so bad, there's no point in reving higher anyways.
So yes, if you want to rev to 9 or 10k, stay away from the the 64. You won't make any decent power vs the other combination and the acceleration rates are dangerous and you'll end up with oval rod ends at best.