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Old 08-03-2006, 03:02 PM   #21
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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.
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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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Old 08-03-2006, 04:56 PM   #22
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Newb- That header looks SOO familiar


This is great info, I will stick this up on top.
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Old 08-03-2006, 05:50 PM   #23
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I just wish we could get an experts input on this. It's not even vehicle specific just 4cyl. specific so if anybody has a friend who knows their exhaust ask them about firing order and header configuration, because right now it looks like any configuration works.
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Old 08-03-2006, 07:52 PM   #24
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I came home from work so excited to see so many posts, and that this became a sticky ... but alas, not quite there yet ... good information guys, keep it up!

this might help; [hint; it's plain english] and leans toward the 1-3-4-2 firing order doing better by having cylinders 1 and 3 seperated ... I could be wrong, I'm so burned out from work.

http://auto.howstuffworks.com/question172.htm

so; have we come up with a solution yet?

----[edit below]----

I also thought we should probably follow the way ford racing headers work, since they designed the engine, and probably know more about what they're doing ...

----[edit above]----
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Old 08-03-2006, 09:34 PM   #25
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What the hell man, this is getting more and more complex. I found out the mustang 2.3L 4Cyl shares the same firing order as well, and their after market headers use both the 1-3 and 4-2 pattern, and the 1-4 and 2-3 pattern... so its pritty much evenly split now.
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Old 08-03-2006, 09:41 PM   #26
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1-4 and 2-3 gets my vote, it just amkes more sense; backpressure is going to build up big-time if both 1 and three are going off after each other, into the same downpipe ... seems as if you would want 1 going off, then 3 into the other set, then 4 into the same as 1, and finally 2 into the last pipe, nothing builds up as pressure ...

I guess my real question would be; what exactly fits our engine, rather than which one uses the correct order? Any clues to something we can find relatively simply? (as in; go to this website, click add to cart, install)
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Old 08-03-2006, 09:47 PM   #27
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ok, VW MK@ Jetta has the same firing order and use the AVT/ escort focus design in their after market...
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Old 08-03-2006, 10:03 PM   #28
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Quote:
Originally posted by pLaYa2284

I guess my real question would be; what exactly fits our engine, rather than which one uses the correct order? Any clues to something we can find relatively simply? (as in; go to this website, click add to cart, install)

ok, so this is where we need jeff to chime in. In the Goodies list here it says that the 86-90 GT header is the one to modify, however in my serach I found no GT for 86-90.

Here is what I found that might fit-

Ford Escort (86-90) 1.9L SOHC - 1-1/2", 2 1/2", 169854 $302.29
OR
Ford Escort (91-96) GT 1.8L - 1-5/8", 2 1/4", 169872 $302.29

link- http://www.horsepowerfreaks.com/pric...Jet_Hot_Coated
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Old 08-03-2006, 10:21 PM   #29
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Also I found out that the 86-90 GT uses the 1.9 SEFI version of the CVH motors, so does that mean that any SEFI header bolts up??? I'll keep looking around
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Old 08-03-2006, 10:33 PM   #30
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haha, got you working overtime on here?
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