Quote:
Originally Posted by WingsofWar
i think any inline engine that runs a true dual is kinda retarded, because it has a single exhaust bank. I don't think any 4s come with true duals or any flat-4s for that matter even with 2 exhaust banks.
For small engines like the FB20 i don't believe there are enough exhaust gases being pushed out to see any more gains on a true dual setup vs a single exit on a street car. Just added weight.
But once we get to a level of performance achieved in which fuel and engine tuning are more fickle and demanding, a true duals setup helps further monitor engine performance via 2 EGTs or 2 WO2, and provides additional power to each bank separately. But at that point its more like track car status.
Only reason why rotaries benefit from a true dual setup despite being a 1.3 liter is that they physically push an equivalent gas volume of a 2.6L v6.
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I think you are right in that it might not make sense for an inline 4. For a flat 4 though, I guess we'd have to see some tests. As for the output volume it would really depend on the diameter. If performance gains are realized for say, a 3" single pipe, it would be reasonable to expect similar or even better gains from a true dual with ~2" pipes.