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10-15-2009, 04:58 PM
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CC Member
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Join Date: Oct 2009
Cobra Make, Engine:
Posts: 2
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Not Ranked
351 windsor question
i have a cobra 351 windsor and have a issue when heavy accel starts popping then takes off hard, ive rebuilt carb, test msd dist, replaced coil, adjusted valves, ck timing, holley carb been gone thru. what else help.
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10-15-2009, 05:26 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: 9,417
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Not Ranked
What are you calling popping?
What was your initial/total time set at?
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10-15-2009, 06:59 PM
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CC Member
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Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,448
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Not Ranked
You need to check fuel pressure under acceleration. That can be tough to do without a dyno, though.
If you can buy/borrow a LM-1 or something similar, you can see what the AFR is doing when it's popping. I'd bet that's well above 14:1.
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10-15-2009, 10:53 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
Quote:
Originally Posted by SPRBLKXX
i have a cobra 351 windsor and have a issue when heavy accel starts popping then takes off hard, ive rebuilt carb, test msd dist, replaced coil, adjusted valves, ck timing, holley carb been gone thru. what else help.
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Some more info about the engine would be helpful, compression, cam timing etc and what carb you're running.
"carb been gone through"? Was it running ok before?
Continous popping? or backfire through the intake on hard acceleration?
Either way the engine's not liking the momentary incorrect A/F ratio, accelerator pump volume correct and duration too long or short (pump nozzle) or volume incorrect (pump cam).
Double pumper, vac sec?
__________________
Gary
Gold Certified Holden Technician
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10-15-2009, 11:20 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Quote:
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Either way the engine's not liking the momentary incorrect A/F ratio, accelerator pump volume correct and duration too long or short (pump nozzle) or volume incorrect (pump cam).
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Gary is on the money, check the accelerator pump circuit.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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10-16-2009, 06:30 AM
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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: 9,417
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Not Ranked
He needs to clarify what kind of popping it is....could be a lot of different things, including detonation if he's hammering it under a load at a very low rpm.
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10-16-2009, 06:41 AM
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CC Member
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Join Date: Oct 2009
Cobra Make, Engine:
Posts: 2
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The car is a kit car, 200 miles on it. Friends car, Engine is a summit 351w with a holley carb ,I ll get size soon. Under normal driving its fine but under heavy accel it starts popping (like its clearing it throat) then it takes off, breaks tires loose type take off. when you get towards the end of that gear starts again. fuel pressure is 6-7 lbs.
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10-16-2009, 11:55 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
Sounds like you have a bad accelorator pump on your carb or you are loading up. First check your fuel bowl levels and make sure you are not getting to much gas in your carb.
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