Go Back   Dakota Durango Message Board > General Parts Forums > Engine Modifications
Home Register Forum Extras Website Features Search Today's Posts Mark Forums Read

Engine Modifications Intake Manifolds, Heads, Camshafts, Roller Rockers & Other Engine Parts

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 10-25-2009, 09:37 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Dual Quad Intake Conversion To Dual 2-BBL Throttle Bodies

I think I am going to try to convert an old low rise Chrysler 273 Offenhauser dual quad intake manifold to fit my Magnum and run two 2-bbl throttle bodies on it. I plan to modify two OEM 50mm TBs which should provide an inexpensive way to substantially increase the cfm for the engine without buying a 4-bbl TB or 58mm TB. The manifold may also provide more even flow to each intake port. I have the OEM TB off my 360 and can pick up another one from a junkyard on the cheap. I will weld in injector bungs and convert to the vertical bolt pattern necessary for the Magnum head. I'll have to figure out the cooling hose location from the LA style to the Magnum. I will try to hook the accelerator and cruise control cable to the front TB along with the MAP sensor. I will also try to hook up the TV cable to the back TB along with the IAC motor and TPS sensor. I may try to use the conversion adapters for a 4-bbl to 2-bbl or make some type of attaching plate.

I am all ears to pros and cons including ideas for this set up.

I just purchased this used and unmodified intake to play with.

__________________


Thank you for looking, Richard
Reply With Quote
  #2  
Old 10-27-2009, 04:42 PM
B Bomb B Bomb is offline
Registered User
 
Join Date: Jul 2009
Location: Virginia
Vehicle: '92 Dakota
Posts: 17
iTrader Rating: (0)
Reputation: 13 B Bomb is just getting started
Manifold

Mounting the throttle body is the least of your worries, ie. locating injectors, matching up to Magnum heads, sensors. Save the vintage manifold for a '66 Barracuda project and port your kegger, and throttle body; you will have better flow than the oldie with MUCH less hassle. You could sell the dual quad for enough to finance a reall nice aftermarket throttle body if you so desire.
Reply With Quote
  #3  
Old 10-27-2009, 04:46 PM
b2™'s Avatar
b2™ b2™ is offline
Yup.....

 
Join Date: Oct 2005
Location: Bushy Fork, NC
Vehicle: 97 Dak, 84 Ram, & 08 Kawi
Posts: 6,040
iTrader Rating: (13)
Reputation: 120 b2™ is just really niceb2™ is just really nice
Send a message via AIM to b2™
Well for people who want to replicate this and haven't bought their heads yet. EQ Heads has some 2.02 Magnum Heads that are drilled for the LA intakes. But the problem still lies with injector placement etc.
__________________


Reply With Quote
  #4  
Old 10-27-2009, 05:01 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
Mounting the throttle body is the least of your worries, ie. locating injectors, matching up to Magnum heads, sensors. Save the vintage manifold for a '66 Barracuda project and port your kegger, and throttle body; you will have better flow than the oldie with MUCH less hassle. You could sell the dual quad for enough to finance a reall nice aftermarket throttle body if you so desire.
Where's your spirit of hotrod adventure?

F&B pulled it off with the old Mopar six pack manifold. It may not work well for me but...nothing ventured...nothing gained.
__________________


Thank you for looking, Richard
Reply With Quote
  #5  
Old 11-05-2009, 02:14 AM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
I have been giving further thought to the low rise Offenhauser intake. A few things concern me: 1) The intake port runners are almost too small for me to port to the size of my ported Edelbrock heads. 2) In order for the throttle body to clear the fuel rails I'd have to use the 1" spacer as well as the 2-BBL to 4-BBL conversion adapter. It may be okay but it seems like a long run and then a somewhat sharp 90-degree angle into the port runners. (But there is a plenum at the bottom and it may be okay.)

I started thinking about using a modified tunnel ram intake instead. It has a nice flowing straight shot into the head ports. There is plenty of room for the injectors. I can make my own adapter plate to the height necessary for hood clearance and can incorporate a plenum for low speed idle quality and MAP signal.

There was a Weiand dual quad tunnel ram for a 340-360 on ebay that was painted orange (with peeling paint) that bid up to $280 plus $20 shipping so let it go before going that high. This morning I found the same intake in great shape (unpainted and unmolested) for $140 locally, so I snapped it up.

Whichever intake I decide to use I'll sell the other one. I'm really leaning toward the tunnel ram though.

__________________


Thank you for looking, Richard
Reply With Quote
  #6  
Old 11-07-2009, 05:56 PM
96BlkDak's Avatar
96BlkDak 96BlkDak is offline
Beer the nectaur of God.


 
Join Date: Aug 2008
Location: S. Arlington, Tx
Vehicle: 1996 Dakota CC V6 5Speed
Posts: 6,702
iTrader Rating: (3)
Reputation: 125 96BlkDak is a glorious beacon of light96BlkDak is a glorious beacon of light
Send a message via MSN to 96BlkDak
how much power are you hoping to make???
__________________
Paul - 1996 Black CC 3.9 and 5speed. 17" R/T wheels. Sport bucket seats. Someday a 408 and 6speed.
I think he knows what America is. America is the mob. Conjure magic for them and they'll be distracted. Take away their freedom and still they'll roar. The beating heart of America is not the marble of the Congress, it's the cellulose of the Hollywood. He'll bring them death, pestilence, and disease - and they will love him for it.

2010 Campaigns are starting, research your candidates and vote for LIBERTY!
Reply With Quote
  #7  
Old 11-07-2009, 06:28 PM
Grapejuice1998's Avatar
Grapejuice1998 Grapejuice1998 is offline
O.G. D.R.T.C.
 
Join Date: Feb 2005
Location: Richardson, Texas
Vehicle: 1998 Dakota R/T RC DA
Posts: 1,365
iTrader Rating: (0)
Reputation: 71 Grapejuice1998 has a spectacular aura about
Quote:
Originally Posted by 98Dak408 View Post

Are you still going to neck them down to accept 2x2bbl t/b's? If so, why not go with 2x4's?

It will also be interesting to see how you address the injectors and fuel rail.
__________________
Reply With Quote
  #8  
Old 11-07-2009, 07:06 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
how much power are you hoping to make???
I don't know. This is an experiment.
__________________


Thank you for looking, Richard
Reply With Quote
  #9  
Old 11-07-2009, 07:18 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
Are you still going to neck them down to accept 2x2bbl t/b's? If so, why not go with 2x4's?

It will also be interesting to see how you address the injectors and fuel rail.
I may fabricate a short 1-2" tall plenum and machine that for the 2x2-bbl TBs to attach to. I'm trying to do this on the cheap and don't want to pay for 2x4-bbl TBs. Perhaps I can modify the plenum that came with the manifold also. Ross Racing has injector bungs that I may purchase and weld into the intake runners. Making and mounting the fuel rails...figuring out the linkage...welding in vertical bolt hole bosses...and tuning will be interesting.
__________________


Thank you for looking, Richard
Reply With Quote
  #10  
Old 11-07-2009, 07:35 PM
96BlkDak's Avatar
96BlkDak 96BlkDak is offline
Beer the nectaur of God.


 
Join Date: Aug 2008
Location: S. Arlington, Tx
Vehicle: 1996 Dakota CC V6 5Speed
Posts: 6,702
iTrader Rating: (3)
Reputation: 125 96BlkDak is a glorious beacon of light96BlkDak is a glorious beacon of light
Send a message via MSN to 96BlkDak
how about machining the 4bbl holes in the first intake into one big ass hole and using 4-2bbl M1 adapters? its a standard 4150 patter at the bottom and a mopar 2bbl pattern on the top.
__________________
Paul - 1996 Black CC 3.9 and 5speed. 17" R/T wheels. Sport bucket seats. Someday a 408 and 6speed.
I think he knows what America is. America is the mob. Conjure magic for them and they'll be distracted. Take away their freedom and still they'll roar. The beating heart of America is not the marble of the Congress, it's the cellulose of the Hollywood. He'll bring them death, pestilence, and disease - and they will love him for it.

2010 Campaigns are starting, research your candidates and vote for LIBERTY!
Reply With Quote
  #11  
Old 11-07-2009, 07:45 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
how about machining the 4bbl holes in the first intake into one big ass hole and using 4-2bbl M1 adapters? its a standard 4150 patter at the bottom and a mopar 2bbl pattern on the top.
I've considered that. With the first intake, I would need the 1" spacer and 2-4bbl M1 adapter in order for the TB linkage to clear the fuel rail. That would work.
__________________


Thank you for looking, Richard
Reply With Quote
  #12  
Old 11-07-2009, 08:31 PM
96BlkDak's Avatar
96BlkDak 96BlkDak is offline
Beer the nectaur of God.


 
Join Date: Aug 2008
Location: S. Arlington, Tx
Vehicle: 1996 Dakota CC V6 5Speed
Posts: 6,702
iTrader Rating: (3)
Reputation: 125 96BlkDak is a glorious beacon of light96BlkDak is a glorious beacon of light
Send a message via MSN to 96BlkDak
Quote:
Originally Posted by 98Dak408 View Post
I've considered that. With the first intake, I would need the 1" spacer and 2-4bbl M1 adapter in order for the TB linkage to clear the fuel rail. That would work.
clearing the fuel rail, didnt think of that. I was trying to think of a simple way.
__________________
Paul - 1996 Black CC 3.9 and 5speed. 17" R/T wheels. Sport bucket seats. Someday a 408 and 6speed.
I think he knows what America is. America is the mob. Conjure magic for them and they'll be distracted. Take away their freedom and still they'll roar. The beating heart of America is not the marble of the Congress, it's the cellulose of the Hollywood. He'll bring them death, pestilence, and disease - and they will love him for it.

2010 Campaigns are starting, research your candidates and vote for LIBERTY!
Reply With Quote
  #13  
Old 11-07-2009, 08:47 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
clearing the fuel rail, didnt think of that. I was trying to think of a simple way.
Simple is good.
__________________


Thank you for looking, Richard
Reply With Quote
  #14  
Old 11-08-2009, 01:40 PM
9t9-5.2's Avatar
9t9-5.2 9t9-5.2 is offline
Registered User

 
Join Date: Feb 2006
Location: IA
Posts: 1,125
iTrader Rating: (0)
Reputation: 40 9t9-5.2 must have done something right
What about fabricating a intake from scratch?
Reply With Quote
  #15  
Old 11-08-2009, 04:03 PM
98Dak408's Avatar
98Dak408 98Dak408 is offline
Supporting Vendor
 
Join Date: Feb 2009
Location: Detroit Area, Michigan
Vehicle: 1998, CC Dakota R/T
Posts: 292
iTrader Rating: (3)
Reputation: 18 98Dak408 is just getting started
Quote:
What about fabricating a intake from scratch?
I've considered that but modifying an existing manifold "should" be easier and cheaper. I haven't ruled that out though.
__________________


Thank you for looking, Richard
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 01:30 AM.


Powered by vBulletin® Version 3.6.7
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Copyright 2001-2008 Dakota-Durango Archive