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08-14-2006, 04:15 AM
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CC Member
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Join Date: Oct 2002
Location: sydney australia,
nsw
Cobra Make, Engine: .
Posts: 218
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Not Ranked
cfm
What is the CFM rating a single 44 idf weber?
My 347 has a 650dp, rpm air gap, 10.1 comp, 238/248@.050 solid flat tappet, 4.1 rear ,tremec, weekend cruiser.
If I was to change the 650dp over to twin 44idf's would I increase torque? hp? Or is it not worth the trouble?
Last edited by 347; 08-14-2006 at 04:24 AM..
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08-14-2006, 08:58 AM
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CC Member
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Join Date: Oct 2002
Posts: 42
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Idf
why not go with something like this
http://www.twminduction.com/v8_kits/v8_kits-FR.html
Quote:
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Originally Posted by 347
What is the CFM rating a single 44 idf weber?
My 347 has a 650dp, rpm air gap, 10.1 comp, 238/248@.050 solid flat tappet, 4.1 rear ,tremec, weekend cruiser.
If I was to change the 650dp over to twin 44idf's would I increase torque? hp? Or is it not worth the trouble?
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08-19-2006, 06:57 PM
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CC Member
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Join Date: Oct 2002
Location: sydney australia,
nsw
Cobra Make, Engine: .
Posts: 218
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Not Ranked
I would like to but I dont have the dollars.
Does anybody have any input or suggestions?
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08-20-2006, 08:15 AM
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CC Member
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Join Date: May 2004
Location: centralia,
IL
Cobra Make, Engine: B&B cobra (sold), Hurricane HMS1002 (sold), Kirkham 289 FIA, (sold) RCR GT 40(sold) SPF GT40 2122(sold) Hurricane HMS2002, (sold) RCR SLC (sold) GTR on the way!
Posts: 1,288
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Not Ranked
My 48 IDA's flow aroung 330 per barrell but go to individual runners. It doesn't sound like you have an individual runner set up. I think the IR setup is where the torque is created. If your 2 carbs are on a plenum shared by all cylinders, then I doubt you will see a big difference in torque. That is just my guess. It would still look cool! 
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High Maintenance Racing Team
Run & Gun 2003 - 2013 
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08-20-2006, 11:56 PM
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CC Member
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Join Date: Sep 2004
Location: Canberra,
ACT
Cobra Make, Engine: G-Force Cobra '68 302, T-5, Jag 3.77 LSD.
Posts: 993
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Not Ranked
Given the Webers tunability, I would expect you would see some good improvements in torque and HP, but mainly driveability. The Webber can be tuned precicely right through the rev range where as a Holley is limited to main jet and pump squirters, unless of course you get one modified.
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SLIPRY
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08-26-2006, 05:07 AM
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CC Member
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Join Date: Jul 2003
Location: Ablis,
78
Cobra Make, Engine: Cobra Daytona (from USR) 302RDI Yates headed + Weber induction
Posts: 253
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Not Ranked
Quote:
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Originally Posted by 347
What is the CFM rating a single 44 idf weber?
My 347 has a 650dp, rpm air gap, 10.1 comp, 238/248@.050 solid flat tappet, 4.1 rear ,tremec, weekend cruiser.
If I was to change the 650dp over to twin 44idf's would I increase torque? hp? Or is it not worth the trouble?
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Weber CFM depends mainly of your ventury size (335 cfm for my 48IDF with 42mm venturis). Not sur that a Weber change will increase torque at low rpm significantly. Usually, Weber advantages are mainly between the middle to top end (according to your camshaft characteristics, I believe that expected Weber benefit will be between 4000 to 6500+ rpm). However, a 44IDF works well for a 289/302 engine but for a 347cid I think that a 48IDF with 40mm ventury will be more efficient.
Everybody agree that a good exhaust collector have to be designed with each pipe in the same length to be efficient. I believe that this rule is also applicable to the inlet manifold 
Last edited by nanard289; 08-26-2006 at 05:12 AM..
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