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CC Advertisers
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09-16-2007, 10:04 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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Not Ranked
This article at Inglese Inductions helps to understand the Weber carb and its problems and fixes, I found it was a good place to start:
http://inglese.com/tech.htm |
09-16-2007, 10:05 AM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
that is a good article but all bets are off with Deans motor as well as a stroked 427
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SPF Daytona coupe 055, Roush 427R
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09-16-2007, 11:20 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
I am running really rich on the idle circuit. If I open the mixture screws, won't that make the engine run richer? If it fixes the popping would I want to go to a smaller idle jet? When the plates are closed, opening the screw should fix the popping to richen the mix. How do I lean out the off idle A/F ratio? Is that a larger idle jet holder? I am already at 120.
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High Maintenance Racing Team
Run & Gun 2003 - 2013 
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09-16-2007, 01:24 PM
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CC Member
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Join Date: Jan 2003
Location: Atlanta,
GA
Cobra Make, Engine: CAV GT40 with 331 KC
Posts: 2,187
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Not Ranked
I thought I remember reading that these are so easy to set up?
Yeah, right.
Last edited by PatBuckley; 09-16-2007 at 03:50 PM..
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09-16-2007, 01:30 PM
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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
It probably wouldn't be to bad if I had a jet kit. My thought is maybe go to a 55 or 60 idle jet. that would allow me to back out the mixture screw a full turn so maybe it wouldn't lean out when I am coasting down in RPM's with the throttle plate closed. Do you think that makes sense?
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High Maintenance Racing Team
Run & Gun 2003 - 2013
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09-16-2007, 01:59 PM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
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Not Ranked
Deane,
Dont Coast, use the blasted brakes to slow down, thats what you put those big rotors on there for. 
Now in regard to your jetting, if its a 'lean' pop then go to a slightly smaller air corrector in the main circuit rather than the idle-reason being that regardless of you having closed the throttle that big cube unit of yours will actually pull the throttle blades partially open under engine braking conditions. Think about it, you cannot get that much air thru those 3 or 4 idle and transition orifices of 1mm dia each.
As Pat has mentioned that combo is going to try your patience to get setup correctly-dont make it harder for yourself by trying to make the carburettor into a brake caliper.
Have just done a quick check on your jet sizes etc, its a mile away from where I would start , will post later, gotta go earn a buck- monday morning here.
Jac Mac
Last edited by Jac Mac; 09-16-2007 at 02:08 PM..
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09-16-2007, 03:06 PM
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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
Thats how you are going to leave me?  Come on, tell me where you would set the starting point.
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High Maintenance Racing Team
Run & Gun 2003 - 2013
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