| Re: [GMCnet] Dual Carb Intake [message #165729] |
Sun, 08 April 2012 10:30  |
enate98690
Messages: 23
Registered: January 2012
Karma: 0
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Junior Member |
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Hey Chris,
I was very interested in your post because I have a dual quad carb Offenhauser intake that I want to put on my '73 GMC at some point. I believe that the dual carbs would offer a substantial power increase over the small, standard Q-Jet the factory put on the GMCs.
As for the gas use, I really believe it is how the dual quad carbs are linked and how hard you put your foot down. For example, if you mounted two, fairly small Holleys (with a combined CFM greater than the standard Q-Jet, of course) and you linked them progressively (i.e., so the second one only kicks in after the first is wide open or almost wide open), you could end up with gas mileage fairly similar to the Q-Jet - as long as you don't put your foot in it too often. But let's face it, the whole reason for mounting dual 4BBl is so you can put your foot in it ;)
The basic concept isn't too different from turbocharging the 455. As long as you don't sink your foot down and kick in the turbo boost, your gas mileage will be fairly similar to the non-turbo 455. But you will also have the turbo when you want/need it. The one thing you will get with the dual quads you won't get with the turbo is the intake roar of the two 4 barrels opening =) =) =)
Those are my views at least =)
Thanks,
Keith
-----Original Message-----
>From: Chris Choffat <cchoffataz@yahoo.com>
>Sent: Apr 7, 2012 7:36 PM
>To: gmclist@temp.gmcnet.org
>Subject: [GMCnet] Dual Carb Intake
>
>
>
>Anyone interested in this, I have the guy's number. It still has the crossover...
>
>http://www.gmcmhphotos.com/photos/showphoto.php?photo=43794&title=dual-carbs-anyone-3f&cat=500
>--
>-Chr$: Perpetual SmartAss
>Scottsdale, AZ
> "The Escape Pod" A 77 Ex-Kingsley Featuring: Olds 455, Manny Power Drive, 3:21, Rockwell, Jim B QJET, Quadra bag. Still needs paint!
>
>Photosite: Chrisc "It has Begun"
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| Re: [GMCnet] Dual Carb Intake [message #165738 is a reply to message #165729] |
Sun, 08 April 2012 11:20  |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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The beauty of the quadrajet is that the primaries are small to allow good atomization of fuel at low rims, then the secondaries gave more air flow at high revs.
Since the motorhome needs more torque down low than upper rpm horsepower, the quadrajet is not a bad choice.
I think any dual carb manifold would also require you to elevate the engine hatch.
George Rudawsky
Chicago, IL
75 Palm Beach
[Updated on: Sun, 08 April 2012 11:20] Report message to a moderator |
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| Re: [GMCnet] Dual Carb Intake [message #165739 is a reply to message #165729] |
Sun, 08 April 2012 11:24 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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It wouldn't be a good thing if you live in hill country but it would sound impressive with your foot in it.
Roy Keen
Minden,NV
76 X Glenbrook
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