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Old 08-03-2006, 04:02 PM   #21
phord_phocus86
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what i am getting from that read is that both are correct


This first solution works like the SVT/Escort GT headers by seperating the firing order so that they can move more freely for more HP.
Quote:
The optimum cure to this whole problem is to correct the exhaust firing cycle. The two cylinders that fire in succession into each collector have to be separated. This can be done partially by a "Tri-Y" header, where the four primary tubes from each bank merge into two secondary tubes (separating the two pulses firing in succession) and finally collect into a single collector. This type of header helps, but the two pulses are still coming back together at the collector.

This second solution says it creates more vacuum and works like the focussport zetec header for more torque.
Quote:
The second optimum cure is to cross the two center tubes from each bank, across the engine running them into the collector on the opposite side. This makes the firing cycle in each collector 180 degrees apart, the same as a four cylinder engine. Once this firing order is achieved, the small collector outlet diameter can be used and the "High Velocity Scavenging" at low R.P.M.s cures the reversion problems and eliminates the need for extreme cam duration.

I'm pritty sure I'm getting this right....
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