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Old 11-24-2004, 06:59 PM
Ciscokid
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Exhaust question

I got this info from a website, anyone do this or care to comment?? Thanks



The first modification I recommend would be to create a complete dual exhaust from the individual cats to the rear of the car. This would eliminate the single secondary cat. The three cylinders on each bank of a flat-six engine fire evenly every 240 degrees of crankshaft travel. Since there is no overlap during this period, this eliminates the problem of one cylinder exhausting while another cylinder's exhaust valve is still open. So keep the two sides completely separate. This will result in the best flow with no reversal. Don't go too large on the pipe diameter, or you will slow the velocity of the exhaust and ruin the mid-range scavenge effect. I would recommend 2" exhaust as a maximum. Definitely do NOT use the 'most advanced new' method of using sewer pipe to conduct exhaust gas away from the vehicle. In some quest for the least amount of backpressure, these folk are missing the point that harnessing the velocity of the exhaust gases creates a scavenge affect that is better than zero backpressure.
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Old 11-24-2004, 07:27 PM
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Chiketkd Chiketkd is offline
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A true 2" dual set-up will work well with our cars but sound horrible. Basically, the sound emanating from the exhuast pipes wouldn't be a lovely flat 6, but more like two raspy 3 cyl engines running at the same time.

That's why it'll still be a good idea to use a cross-over pipe between the two sides.

-Chike
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Old 11-27-2004, 08:57 AM
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Quote:
Originally posted by Chiketkd
A true 2" dual set-up will work well with our cars but sound horrible. Basically, the sound emanating from the exhuast pipes wouldn't be a lovely flat 6, but more like two raspy 3 cyl engines running at the same time.

That's why it'll still be a good idea to use a cross-over pipe between the two sides.

-Chike
First keep in mind that the OEM exhaust system becomes a single pipe after the OEM secondary cat. So, the only way to go with a true dual is to remove the secondary cat. If you can do that in the state where you reside, then you can go with a true dual if you like.
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