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Old 08-03-2006, 10:47 AM   #11
phord_phocus86
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Re-updated, have the facts on firing order now. just need the facts on what is the best way to pair the header
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Old 08-03-2006, 12:05 PM   #12
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Quote:
Originally posted by 03_SPI_sedan
ok so it's Focusnewb who has the shorty header....
Nope, I have the FC long tube header. (with the wrong firing order I've heard)



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Old 08-03-2006, 12:20 PM   #13
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no, yours is the right firing order! unless the majority of the zetec headers are wrong.

zetecs have the same firign order as us and look at the focus sport header. same thing.
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Old 08-03-2006, 12:39 PM   #14
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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?
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Old 08-03-2006, 01:00 PM   #15
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Some of the shortys are designed as a 4-1.

As for the wrong firing order, it must be diffrent between this and the V-8's. I mean I'm no expert but I've spent alot of time looking at all the fact I have, and if this is wrong the 90% of the zetec headers have the wrong firing order.
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Old 08-03-2006, 01:02 PM   #16
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Quote:
Originally posted by Dubz
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.
well if you think about it, its a chain reaction 1 and 3 don't fire at the same time, it's 1 then 3 so you have fire#1 working its way down with fire #3 right behind it giving it an extra push.
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Old 08-03-2006, 02:15 PM   #17
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My comment about the Focus Central header being the incorrect firing order was based on what I had read on FJ in their SPI aftermarket parts & mods list.

"focus-central has made the first spi focus aftermarket race header but it has the wrong firing order! However there is no other option except the escort gt header which is alot of work. Wrong firing order or not it has proven to be a worthwhile mod." post by Gigaherz
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Old 08-03-2006, 02:28 PM   #18
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I know I think theres just a big bunch of mis information around theres only two ways, one is correct, one is not. i still think either one is an improvement over the stock one where it is just released but has no where to go. it's kinda like rushing oout of the mall then looking around and figuring you went out the wrong door.
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Old 08-03-2006, 02:34 PM   #19
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ok, i just looked up some more info. The SVT Focus has the same firing order as well and they come stock with a 4-2-1 header that uses the non sequential firing order look here-

so this get more and more confusing...
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Old 08-03-2006, 02:35 PM   #20
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This may or may not be helpful;

http://www.ssheaders.com/header.htm
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