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Re: Is my carb to small?
[Re: Runner]
#2033819
03/18/16 03:00 PM
03/18/16 03:00 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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I ran an 850 dp and a 950 HP with the smaller 1.45 venturi, and the 950 et'd better in my full weight 440 challenger. It felt snappier and had better shift recovery.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: Is my carb to small?
[Re: Runner]
#2033870
03/18/16 03:51 PM
03/18/16 03:51 PM
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Joined: Oct 2007
Posts: 4,210
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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The Holley metering (CFM vs. pressure drop across the nozzle) is designed to operate accurately at 1.5" Hg.
If you pull more than that (bigger engine, smaller carburetor; sometimes small plenum):
1. you're leaving some power on the table
2. your A/F BSFC will be slightly off (rich on top)
3. the carb is flowing more than it's rated at
Below 1.5" the signal isn't as effective as I'd like, and needs some work-around with air bleeds etc. but can still help.
Below 1": stop unless you enjoy pain.
Boffin Emeritus
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Re: Is my carb to small?
[Re: dogdays]
#2034235
03/19/16 01:30 AM
03/19/16 01:30 AM
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Joined: Dec 2014
Posts: 304
Florida
Mark Whitener
enthusiast
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enthusiast
Joined: Dec 2014
Posts: 304
Florida
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I think it's a slam dunk. If you're buying a 950HP carb, make sure it's one of the newer ones that were actually 950 cfm, and not the earlier ones that the 950 was just a name.
R. You don't want the new 950, the Venturi design is not right. I've spent a lot of flow bench time with them. The Quick Fuel 1050 4150 is a much better choice, and I would suggest annular boosters. Custom carb would be ideal.
Mark Whitener
[url=www.racingfuelsystems.com[/url]
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