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Old 08-03-2006, 12:39 PM   #14
Focus Jr. Enthusiast
Join Date: Feb 2006
Fan#: 32315
Location: Manitoba, Canada
What I Drive: 2000 Focus SPI

Posts: 34
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For firing order, you do not want to group the two firing together at the same time until as late as possible.

This would GREATLY reduce flow, as you have 2 times as much air trying to pass through the same size pipe. If they join up further downstream they will have cooled an amount and therefore will require less volume. also i belive that the flow past the other primary tube creates a vaccum which helps scavange exhaust gasses.

At least this is the theory in v8 headers. which i would imagine would be the same.

has anyone tried to make a 4-1 design like the headers i have on my torino? why the tri-y's that the musclecar community now says are crap for performance? Or is it that the tri-y's make more low end tq, and that's more what the spi needs than top end potential?
2000 Ford Focus dialy driver
Short throw shifter, some custom interior pieces

hopefull mods - getting rid of the riceness that was added by the previous owner

Last edited by Dubz; 08-03-2006 at 12:54 PM.
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