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347 08-14-2006 04:15 AM
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?

Hankcar 08-14-2006 08:58 AM
Idf
 
why not go with something like this
http://www.twminduction.com/v8_kits/v8_kits-FR.html
Quote:
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?

347 08-19-2006 06:57 PM
I would like to but I dont have the dollars.

Does anybody have any input or suggestions?

dlampe 08-20-2006 08:15 AM
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!:D

David Hodgson 08-20-2006 11:56 PM
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.

nanard289 08-26-2006 05:07 AM
Quote:
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?
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 ;)


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