Duratec manifold spotters guide. - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus Second Generation > DURATEC Performance (2008-2011)

DURATEC Performance (2008-2011) The place to chat about any Duratec 20 engine performance, tuning and exhaust related upgrades.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 08-22-2010, 07:00 PM   #1
tb1999
Focus Addict
 
tb1999's Avatar
 
Join Date: Feb 2007
Fan#: 44261
Location: Northern NJ, United States
What I Drive: '05 ZX3 D2.3 & '03 Jag S-TYPE 4.2L

Posts: 1,219
FF Reputation: 47 tb1999 Great Standing Member
Buy-Sell-Trade Rating: (7)
Post Duratec manifold spotters guide.

OK, during my engine build for 2010 I needed to retain a stock Intake Manifold for class rules, so I ended up looking at alot of stock IM's used on various DURATEC engines and this is what I have learned.

First off, all of the DURATEC Manifolds for FWD vehicles are black plastic. Only the Ranger uses an aluminum manifold.

Second, there are two types intake manifold control systems used on the DURATEC Engine.

The "Tumble Flap" device is a simple butterfly valve located in the manifold runners within 1/2" of where it mates to the cylinder head. This is mainly an emissions device to improve combustion in the engine by creating a "tumble" motion in the intake airstream as the air enters the cylinders.

The "Runner Control" device is another butterfly valve buried deep in the center of the manifold. This is an engine performance tuning device that allows the ECM to switch between the long or short path through the manifold. The longer path is used at lower RPM's to enhance low end torque, the short path is used at higher RPM's to improve peak power.

Details:

I have personally handled 3 types of DURATEC Manifolds:
2005 D20 Focus
2004 D23 Focus
2006 D23 Escape

These 3 manifolds use a unique combination of the 2 control devices as follows:

The D20 Manifold only uses the Tumble Flaps
Both D23 manifolds use the Runner Control flap.
Only the D23 Focus Manifold uses both the Tumble Flaps and Runner Controls.

Pics:
D20, note how narrow it is in the middle. (no Runner Controls)


D20, this only has the Tumble Flaps, there is a single vac actuator and solenoid located under the TB.


D23, wider in the middle to make room for the Runner Controls


D23, may have only Runner Control or could have Tumble Flaps also.




These are shots of where the Tumble Flaps would be. The first pic is after existing Tumble Flaps were deleted, leaving the holes in the runner where the shaft would normally pass through.


This one is from a D23 Escape which was not mfg with tumble flaps so the runners have no holes in them.


Final techincal notes. Since I was doing lots of computer simulations for my engine build, I needed to get accurate runner dimensions/lengths.

This is what I came up with.

The ports are ovals and have a width of 1.9" and height of 1.3". This yields a CSA of just over 2 square inches. This appears to be the same for all 3 manifolds.

The D20 has a single intake runner path approx 14" long.

The D23 with the Runner Control flap has 2 paths through the manifold with the long path being approx 17" long, and the short path being approx 11" long.

All runner lengths were calculated from the parting face where the manifold meets the head to the point where the individual runner meets the common plenum chamber in the manifold, measured through the approximate center of the runner.


__________________
213 whp / 160 wtq D23 NA with stock intake and TB.

Inventor of "The $0 Thunder Throttle" & "Focuzdax-7" brake swap.
I like the same qualities in women and pistons; Lightweight, fast, and with the smallest skirts possible...

Last edited by tb1999; 08-22-2010 at 09:09 PM. Reason: sp
tb1999 is online now  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 08-22-2010, 07:10 PM   #2
jetrinka
Focus Fanatic
 
jetrinka's Avatar
 
Join Date: Mar 2007
Fan#: 45622
Location: Snohomish, WA
What I Drive: 88 5-speed XR4TI

Posts: 7,528
FF Reputation: 180 jetrinka Excellent Standing Memberjetrinka Excellent Standing Member
Buy-Sell-Trade Rating: (6)
Very good info. Should be added to the Duratec Wiki if EGZ sees this.
jetrinka is offline  
    Reply With Quote
Old 08-22-2010, 07:21 PM   #3
ehancock
un1corn
 
ehancock's Avatar
 
Join Date: Feb 2008
Fan#: 53353
Location: Farmington Hills, MI, MI
What I Drive: 2004 Twilight Blue D23 ZX5

Posts: 2,702
FF Reputation: 14 ehancock Great Standing Member
Buy-Sell-Trade Rating: (7)
It's like you were reading my mind! I'm glad you got
all this data and posted it! Someone with a cossie manifold needs to
measure the runner size and length.
ehancock is offline  
    Reply With Quote
Old 08-22-2010, 08:52 PM   #4
tb1999
Focus Addict
 
tb1999's Avatar
 
Join Date: Feb 2007
Fan#: 44261
Location: Northern NJ, United States
What I Drive: '05 ZX3 D2.3 & '03 Jag S-TYPE 4.2L

Posts: 1,219
FF Reputation: 47 tb1999 Great Standing Member
Buy-Sell-Trade Rating: (7)
Quote:
Originally Posted by ehancock View Post
It's like you were reading my mind! I'm glad you got
all this data and posted it! Someone with a cossie manifold needs to
measure the runner size and length.
warneej has the Cossie IM, it's actually his donated stock take-off manifold that I have bolted on my race motor.

Anyway, I'm pretty sure the Cossie IM has very short runners, not more than 5-6" inches long.
__________________
213 whp / 160 wtq D23 NA with stock intake and TB.

Inventor of "The $0 Thunder Throttle" & "Focuzdax-7" brake swap.
I like the same qualities in women and pistons; Lightweight, fast, and with the smallest skirts possible...
tb1999 is online now  
    Reply With Quote
Old 08-22-2010, 08:57 PM   #5
1BlackST
Focus Enthusiast
 
Join Date: Feb 2010
Fan#: 72637
Location: Memphis, TN
What I Drive: 2007 Pitch Black ST

Posts: 136
FF Reputation: 1 1BlackST Good Standing Member
Buy-Sell-Trade Rating: (0)
did i just get educated??
i think i did... someone should send this to egz for the duratec wiki page..
__________________
ST Crew #84
153.26 whp, 153.45 wtq
1BlackST is offline  
    Reply With Quote
Old 08-22-2010, 09:43 PM   #6
ehancock
un1corn
 
ehancock's Avatar
 
Join Date: Feb 2008
Fan#: 53353
Location: Farmington Hills, MI, MI
What I Drive: 2004 Twilight Blue D23 ZX5

Posts: 2,702
FF Reputation: 14 ehancock Great Standing Member
Buy-Sell-Trade Rating: (7)
Yeah I had one but sold it this past winter. I should have measured them when I had it. The runners are very short and iirc appear to be "trumpet" shaped with velocity stacks. Still would be nice to have exact measurements though
ehancock is offline  
    Reply With Quote
Old 08-22-2010, 10:04 PM   #7
SaleenT121
Focus Addict
 
SaleenT121's Avatar
 
Join Date: Jul 2008
Fan#: 57997
Location: Birmingham, AL
What I Drive: 05 Saleen Focus

Posts: 565
FF Reputation: 3 SaleenT121 Good Standing Member
Buy-Sell-Trade Rating: (3)
Based on the dimensions, what reasons would you chose one manifold over the other?
__________________
Saleen Focus #74
-Carbon Hood and trunk
-SVT rear Disc brake conversion
-Custom fab turbo kit
-Built 2.0L by Turbo Turtle
SaleenT121 is offline  
    Reply With Quote
Old 08-22-2010, 10:32 PM   #8
tb1999
Focus Addict
 
tb1999's Avatar
 
Join Date: Feb 2007
Fan#: 44261
Location: Northern NJ, United States
What I Drive: '05 ZX3 D2.3 & '03 Jag S-TYPE 4.2L

Posts: 1,219
FF Reputation: 47 tb1999 Great Standing Member
Buy-Sell-Trade Rating: (7)
Quote:
Originally Posted by SaleenT121 View Post
Based on the dimensions, what reasons would you chose one manifold over the other?
I had to use the stock D23 manifold for the class rules, since it's technically an engine swap the manifold and TB from the donor engine was a required.

As it turns out, if I had a choice between the D20 and D23 manifolds, I would have picked the D23 anyway. Having the different runner lengths means I can get a bit more low end torque from the longer runner, and keep it pulling to about 7250 on the short runner before power starts to drop off significantly.

Since I don't have a racing close ratio gearset in the trans yet, having this extra flexibility in the torque/power bands is a big plus for road racing.

In my case, according to the simulation, having the 11" short runner gets my peak BHP close to 250. (we'll have to see what the dyno says) which is about 20BHP more than what I could hit on the 14" or 17" runners.
__________________
213 whp / 160 wtq D23 NA with stock intake and TB.

Inventor of "The $0 Thunder Throttle" & "Focuzdax-7" brake swap.
I like the same qualities in women and pistons; Lightweight, fast, and with the smallest skirts possible...

Last edited by tb1999; 08-22-2010 at 10:44 PM. Reason: added image
tb1999 is online now  
    Reply With Quote
Old 08-23-2010, 12:52 AM   #9
K26
Focus Fanatic
 
K26's Avatar
 
Join Date: Oct 2007
Fan#: 51125
Location: Sardinia, Ohio, OH
What I Drive: 2006, Red, turbo'd ST

Posts: 1,682
FF Reputation: 8 K26 Good Standing Member
Buy-Sell-Trade Rating: (6)
Quote:
Originally Posted by ehancock View Post
It's like you were reading my mind! I'm glad you got
all this data and posted it! Someone with a cossie manifold needs to
measure the runner size and length.
I actually will be getting your IM this week i hope. just bought it from the guy that bought it off you. I will measure when i get it. Is there a sticky anywhere with all of the Cossie IM install anywhere. I would just like to read and study it for a few days
__________________
FOCUS FACTOR
K26 is offline  
    Reply With Quote
Old 08-23-2010, 07:18 AM   #10
ehancock
un1corn
 
ehancock's Avatar
 
Join Date: Feb 2008
Fan#: 53353
Location: Farmington Hills, MI, MI
What I Drive: 2004 Twilight Blue D23 ZX5

Posts: 2,702
FF Reputation: 14 ehancock Great Standing Member
Buy-Sell-Trade Rating: (7)
Yeah, I think egz scanned it and put it on the dutatec wiki and I might have a PDF of it on my work computer, I'll check today. It might be a pita but an accurate measurement of plenum volume might be helpful to everyone as well.
ehancock is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks

Tags
design, duratec, identify, intake manifold, specs

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:06 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information : Site Map

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.