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 17Likes
03-25-2020, 09:13 AM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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Not Ranked
Carburetors
Let's hear some opinions and preferences about carbs. Different makes or different models.
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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03-25-2020, 09:42 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine: SPF GT40
Posts: 237
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Not Ranked
QuickFuel 750 mechanical. Ability to change all jets especially idle fuel restrictor. Most Holley carbs have a fixed idle fuel orifice and it's too big.
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03-25-2020, 10:26 AM
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CC Member
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Join Date: Oct 2007
Location: Rockford / Mesa, AZ,
IL
Cobra Make, Engine: FFR, 347, 462 hp, 4 barrel
Posts: 487
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Not Ranked
Quick Fuel 650 cfm on a 347 ci engine. Set up on dyno then final adjustments made with a O2 sensor in pipes. No choke also. I have not touched any adjustments in over FIVE years.
Lee
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03-25-2020, 10:58 AM
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CC Member
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Join Date: Jun 2001
Location: Mesa,
AZ
Cobra Make, Engine: ERA #2119 289FIA
Posts: 5,380
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Not Ranked
I had "Pro Systems" build a carb for my Biggie Rat and was totally pleased. Bolted it on, set idle speed, and WOW! I even loaned it to my Buddy, Camaro Bob, and he liked it so well that he ordered one. There's an extensive info sheet to fill out and Patrick will build a carb specific to your needs. At the time it was maybe $100 more than a HiPo Holley off the shelf and so worth the money. Your asked, I'm telling. My 2¢ worth.
__________________
Karlos
"In the Land of the Pigs, The Butcher is King"
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03-25-2020, 11:40 AM
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CC Member
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Join Date: Sep 2012
Cobra Make, Engine: ERA #816, 427 Side Oiler
Posts: 92
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Not Ranked
I have a 850DP with mechanical secondaries and 4 corner idle I rebuilt myself. I did have Holley re-dichromate the carb since it was previously installed on my Chevelle big block car... I eliminated the choke and did the tuning myself (if you are not familiar there are a couple of books out there that have VERY good information). I understand that not everyone is a carb guru and that small businesses need to make money but I really try to shy away from paying for something I can do myself. I personally find that Holley carbs are VERY EASY to tune given the basic knowledge set. My main advice on the matter is, you can usually make a larger carb run smaller but not the other way around... within reason
Last edited by jetblue69; 03-25-2020 at 11:48 AM..
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03-25-2020, 03:45 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,415
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Not Ranked
I'm a Quick Fuel guy. Pretty much all I use.
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03-25-2020, 04:55 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Holley Ultra XP 850, BLP Rapid Jet Metering Blocks, External PV referencing.
Constructed from all new parts.
PV opening point externally adjustable, all fuel and air metering can be changed without removing a fuel bowl.
__________________
Gary
Gold Certified Holden Technician
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03-25-2020, 05:12 PM
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CC Member
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Join Date: Jul 2005
Location: Carpentersville,IL & Maricopa,,
AZ
Cobra Make, Engine: ACE, 351W, 3550 Tremec, Raging(?) Red W/ White Stripe.
Posts: 2,082
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Not Ranked
Quote:
Originally Posted by Danr55
Let's hear some opinions and preferences about carbs. Different makes or different models.
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OK, Dan, what is the REAL reason for asking? Don't keep us in suspense! 
__________________
SPEED WAS HIGH - WEATHER WAS NOT - TIRES WERE WET - X MARKS THE SPOT
Burma Shave 
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03-25-2020, 08:25 PM
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CC Member
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Join Date: Apr 2016
Location: Phoenix,
AZ
Cobra Make, Engine: Ex owner of a polished Kirkham 427 S/C. Now Cobra-less and driving a mid-engine German hot rod.
Posts: 828
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Not Ranked
I have a Quickfuel 780 with the vacuum secondaries. Works great....
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03-26-2020, 03:49 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,685
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Not Ranked
Quote:
Originally Posted by Danr55
Let's hear some opinions and preferences about carbs. Different makes or different models.
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Spent days on a chassis (not engine) dyno with a virtually unlimited supply of carbs and came to the conclusion, bigger is not always better 
Bill S.
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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03-26-2020, 05:34 AM
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CC Member
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Join Date: Mar 2020
Location: Tellico Village,
Tn
Cobra Make, Engine: Superformance
Posts: 25
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Not Ranked
Quick Fuel 850 DP no issues at all!!!!!
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03-26-2020, 05:58 AM
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CC Member
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Join Date: Jan 2017
Location: Glendale,
AZ
Cobra Make, Engine: FFR MkIV 427
Posts: 635
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Not Ranked
I had a Quick Fuel 780 vs, it would not work well below 1800 rpm with a big cam, no carb will without steady vacuum. Ended up going with a FiTech 800 hp system. Little bit of a learning curve, but it runs smooth and compensates for altitude. Had to add 177 lph in tank fuel pump and a return fuel line.
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04-02-2020, 09:24 PM
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CC Member
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Join Date: Apr 2016
Location: Phoenix,
AZ
Cobra Make, Engine: Ex owner of a polished Kirkham 427 S/C. Now Cobra-less and driving a mid-engine German hot rod.
Posts: 828
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Not Ranked
Quote:
Originally Posted by MKS427
I had a Quick Fuel 780 vs, it would not work well below 1800 rpm with a big cam, no carb will without steady vacuum. Ended up going with a FiTech 800 hp system. Little bit of a learning curve, but it runs smooth and compensates for altitude. Had to add 177 lph in tank fuel pump and a return fuel line.
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My cam is not real big considering the size of my engine (482 ci)....cam is 242/248 at .050 with 112 LSA and lift at .642 intake and .631 exhaust. Installed 4 degrees advanced. Runs great everywhere even below 1800 rpm but I never run there. Likes 3000-6000 best. But....it is a carb so it runs rich at altitude and doesn’t like the cold and....
But it does work as well as any carb I have ever used... |
04-02-2020, 09:34 PM
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CC Member
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Join Date: Apr 2016
Location: Phoenix,
AZ
Cobra Make, Engine: Ex owner of a polished Kirkham 427 S/C. Now Cobra-less and driving a mid-engine German hot rod.
Posts: 828
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Not Ranked
No choke on mine either ... we don’t need no stinkin’ Choke.....it’s Arizona!
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04-03-2020, 07:10 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,283
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Not Ranked
I'm running twin Quickfuel 750s on my 482" KC side-oiler. I had Quickfuel custom build them exactly for my engine. On the chassis dyno they ran 14.7 AFR at idle and 12.4 AFR through the RPM band at WOT.
__________________
Too many toys?? never!
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04-03-2020, 09:08 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,908
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Not Ranked
Holley 770 Street Avenger. Works well, once I sorted out the choke pull-off - when I got it the choke opened about 1/4 as much as it now does.
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Brian
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04-03-2020, 01:35 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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Not Ranked
I got a Blykins built Quick Fuel 750Q from a friend for a song.. I think I'll be quite happy.
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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04-04-2020, 10:24 AM
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CC Member
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Join Date: Jun 2001
Location: Mesa,
AZ
Cobra Make, Engine: ERA #2119 289FIA
Posts: 5,380
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Not Ranked
Danr, who you gonna get to install the new carb for you?
You know things don't go well when you work on your engine
__________________
Karlos
"In the Land of the Pigs, The Butcher is King"
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04-04-2020, 04:16 PM
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CC Member
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Join Date: Aug 2017
Cobra Make, Engine:
Posts: 167
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Not Ranked
Have a 850 mighty Demon very happy with it
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04-04-2020, 06:11 PM
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CC Member
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Join Date: Apr 2016
Location: Phoenix,
AZ
Cobra Make, Engine: Ex owner of a polished Kirkham 427 S/C. Now Cobra-less and driving a mid-engine German hot rod.
Posts: 828
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Not Ranked
Dan what happened to your old carb(s)? Why are you changing?
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