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02-21-2009, 08:11 AM
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CC Member
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Join Date: Feb 2007
Location: Graham, WA,
wa
Cobra Make, Engine: Everett-Morrison, 347 Stroker
Posts: 425
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Not Ranked
Weber said "Good Luck Stopping Popping!!!!
I installed a set of 44 IDF weber carbs on my 347 Stroker. Syncronized carbs but cant seem to stop popping from sidepipes. I spoke to Weber and the man said "GOOD LUCK trying to stop that. Is popping common when using webers. The engine has not been dynoed and perhaps popping could be minimized. Those of you who know webers, what do you think!
Race-it 
Last edited by race-it; 02-22-2009 at 09:29 PM..
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02-21-2009, 09:13 AM
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Administrator
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Join Date: Jan 1999
Location: Duvall,
Wa
Cobra Make, Engine: KMP286, Shelby 482, Webers, 593HP
Posts: 4,162
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Not Ranked
Popping when letting off gas is very common. Popping while accelerating isn't good.
I've tinkered enough to tell you that I don't know how the heck to make it stop popping on deceleration.  |
02-21-2009, 10:44 AM
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CC Member
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Join Date: Feb 2006
Location: Lakewood,
WA
Cobra Make, Engine: FFR, Carb 302
Posts: 359
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Not Ranked
I think they look nice.  |
02-21-2009, 11:10 AM
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Senior Club Cobra Member
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Join Date: Feb 2004
Cobra Make, Engine:
Posts: 1,226
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Not Ranked
Quote:
Originally Posted by Steve Bisson
I think they look nice. |
Like a beautiful woman, until they start acting up.
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02-21-2009, 12:15 PM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
from my limited experience i understand the popping on decelleration to be fuel dumping into the exhaust then igniting when o2 from an exhaust leak is intermixed, how the stuff ignites i have no idea.
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02-21-2009, 12:43 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
When do you experience the popping? Part throttle? Cruise? Deceleration? Full throttle?
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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02-21-2009, 01:01 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 Rick Parker
When do you experience the popping? Part throttle? Cruise? Deceleration? Full throttle?
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As above, when does it happen, what rpm at what throttle?
What's the settings of the carbs:
Venturi, emulsion tube, main, air, idle, pump jet, pump bleed, float level?
You really need a wideband O2 data logger to note the A/F ratio at the time of popping.
__________________
Gary
Gold Certified Holden Technician
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02-21-2009, 02:12 PM
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CC Member
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Join Date: Feb 2007
Location: Graham, WA,
wa
Cobra Make, Engine: Everett-Morrison, 347 Stroker
Posts: 425
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Not Ranked
When do you experience the popping? Part throttle? Cruise? Deceleration? Full throttle?
__________________
It pops at part throttle and deceleration.
Full throttle it screams!!!!!!!!! To bad God made so many trees I could stay at full throttle: 
Jim
Last edited by race-it; 02-22-2009 at 02:00 AM..
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02-21-2009, 02:16 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
Please post the air corrector, and jet sizes (idle & Main) as well as venturi size & emulsion tube # you are currently using.
We need that info before we can point you in the right direction.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 02-21-2009 at 04:15 PM..
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02-21-2009, 09:19 PM
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CC Member
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Join Date: Dec 2001
Location: Olalla Wa.,
wa
Cobra Make, Engine: Classic ND 427 big block 427 ford with tri power I know the 427 didnt come with tri power just wanted something different. 9 inc. ford rear end top loader four wheel dic brakes.
Posts: 402
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Not Ranked
Jim,
As steve said they due look so cool and the Cobra sounds good as you take off. Send me your correct e mial as what I have is wrong.
Andy   |
02-22-2009, 02:03 AM
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CC Member
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Join Date: Feb 2007
Location: Graham, WA,
wa
Cobra Make, Engine: Everett-Morrison, 347 Stroker
Posts: 425
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Not Ranked
Andy,
stormwaterllc@aol.com.
I've lost two hats this weekend with my low rider windshield if you can call it that!!!!!!!! 
It's so unforgiving on I-5 at 80 MPH.
Jim |
02-22-2009, 03:58 AM
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CC Member
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Join Date: Jun 2003
Location: Palma de Mallorca, Spain,
ESP
Cobra Make, Engine: Contemporary with 482 KC/SO, TKO600,IRS Jag/AMP, 3.54 Salisbury PL,
Posts: 578
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Not Ranked
set the idle a little bit higher and turn the mixture screw out a little bit more than needed and most of the popping on deceleration will go away. It will also pop if your idle mixture is too lean.Go one size up on the idle jet.
Also check that your exhaust manifold has no leaks.
Some popping will be always be there, so get used to it.
__________________
Nothing sounds better than a Cobra in a Tunnel !
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02-22-2009, 07:43 AM
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CC Member
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Join Date: Nov 2003
Location: West Barnstable,
MA
Cobra Make, Engine: Shelby CSX4252,aluminum body, 427 side-oiler, Webers
Posts: 138
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Not Ranked
I agree with Eljaro. I have 48IDA's on a Side-Oiler. Backing the idle mixture screws out little-by-little corrected the popping I was getting from the pipes when lifting off the throttle at crusing speed or after accelerating quickly. I didn't have to change the idle jets but that would have been my next step if the idle screw adjustment didn't do it.
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02-22-2009, 09:04 AM
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CC Member
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Join Date: Feb 2007
Location: Graham, WA,
wa
Cobra Make, Engine: Everett-Morrison, 347 Stroker
Posts: 425
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Not Ranked
Unfortunatly, I'm not the mechanic, I will have my mechanic read all posts on Monday and he will ask some more questions I'm sure. Thanks to all you guys who responded. Without people like you, I could not own a Cobra! I am very thankfull.
Jim
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02-22-2009, 08:29 PM
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CC Member
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Join Date: Dec 2001
Location: Olalla Wa.,
wa
Cobra Make, Engine: Classic ND 427 big block 427 ford with tri power I know the 427 didnt come with tri power just wanted something different. 9 inc. ford rear end top loader four wheel dic brakes.
Posts: 402
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Not Ranked
Ray,
I well send you a e mail to see if I got it right. I think you need a chin strap, to keep your hat on, or mybe super glue your hat on. ha ha . Poping, I dont remember any of those race cars in the sixty poping with there webers. They must have had them down cold as far as jetting etc,etc.. I dont think I well put the webers on tell fall, mybe Fred well have them here in June.? They should be close, on the setting as Fred has a 428 and I have a 427. Mybee I should talk to the Viper guy that wanted to trade the guy on BI for his classic 427
Andy |
02-22-2009, 09:33 PM
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CC Member
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Join Date: Feb 2007
Location: Graham, WA,
wa
Cobra Make, Engine: Everett-Morrison, 347 Stroker
Posts: 425
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Not Ranked
Andy, Did you mean me or Ray
If it was me , try to send again.
Jim |
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