Another view of that Engine Masters winning engine

"FalconHoon" (falconhoon) 10/14/2013 at 23:37 • Filed to: None

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My best conclusion is that this design offers both the top-end of 4-1 and low-down of tri-ys

Party-vi > FalconHoon 10/14/2013 at 23:42

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Hmm why split headers?

vdub_nut: scooter snob > Party-vi 10/14/2013 at 23:46

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If you look at head ports, they aren't round (on a two exhaust valve setup). This allows more flow. Not sure why they stay split for so long as opposed to just the first inch or two.

Party-vi > vdub_nut: scooter snob 10/14/2013 at 23:53

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Ah - didn't know there were two exhaust valves. Fancy.

vdub_nut: scooter snob > Party-vi 10/14/2013 at 23:56

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(I'm assuming as much)

DrJohannVegas > vdub_nut: scooter snob 10/15/2013 at 00:21

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It's a Modular (I think...) Cobra, so it should be 4 valves per cylinder.

rotundapig > Party-vi 10/15/2013 at 08:51

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I actually work for the company that runs the dynos there. The split headers give it two different runner lengths, so it's like having exhaust that is tuned for two RPMs. The two primaries are different lengths and will have resonance at two RPM, both in the 3000-7000 range of the pull, kind of giving the engine two peak torques.

Party-vi > rotundapig 10/15/2013 at 09:01

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That is very cool!