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05-10-2009, 05:57 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
This is the present set up for my engine. I have a backfire issue at idle and low throtle. Any suggestions from the guys that use webbers on what to do to minimize popping? I have to re-dyno due to dyno improperly set on last tune up.
347 Stroker
Stroke: 3.400
Bore: 4.030
Connecting Rods: Scat I Beam 5.400"
Pistons: J&E Forged
Cam: Solid Roller
106 Degree LSA In Ck 104 Degree
Dur. In 228@050 Lift .635 Inch
Dur. EX 234@ .050 Lift .638 Inch
Lifters: Comp Cams Solid Roller
Heads: Ford Motor Sports Aluminium 1.94 X 1.6
Rocker Arms: Comp Cams 1.6
Weber: 44 IDF 18990.030
Compression: 10.25 to 1
44 IDF Webber Set Up
Venturi ----------------36 mm
Aux Venturi -------------4.50mm
Main Jet ---------------145 mm
Air Corrector----------- 180 mm
Emulsion Tube---------- F-11
Idle Jet---------------- 55 mm
Pump Jet --------------.50mm
Needle Valve -----------1.75mm
Pump Exhaust Valve----- 55mm
Float Adjustment------- 32.5/10mm
Idle Fuel Screw--------- one turn out
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Advertising
05-10-2009, 08:28 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Somehting isn't right. Or, as my kids say: "something's all jacked up dude".
__________________
All that's stopping you now Son, is blind-raging fear.......
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05-10-2009, 09:50 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
Increase Idle jet to 60.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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05-10-2009, 10:41 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
Rick, What does raising the idle jet size do to minimize popping. If the popping is caused by excess fuel entering sidepipes and igniting, wont that put more fule into the pipes??????
Jim
Last edited by race-it; 05-10-2009 at 10:44 PM..
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05-10-2009, 11:37 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
You said it was backfiring, I understood that to mean back through the carbs? If this is at idle and part throttle up to about 2000 Rpm it's indicative of a lean condition in the idle circuit. If the side pipes are popping then its fat. The emulsion tubes work during light accleration and part throttle cruise.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 05-10-2009 at 11:41 PM..
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05-11-2009, 10:43 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
Thanks again for everyone's input. I went to the forum and read all the weber posts. I am using Champion 3025 plugs and have carbon fouling . Would you change to a hotter plug at this time, and if so, what plug would you recommend.
I changed my idle jets from 55 to 60. My idle mixture screw was one half turn out and I went to one full turn out. I also turned my puel presure regulator down from 4 to 3.
Test drove car, Excessive backfiring through pipes on deceleration, far more than anyone would enjoy driving the car about every 5 seconds when you back off the throtle. I checked for leaks in headers but all bolts were tight and no signs of black marks around headers. Still some sneezing during acceleration. Bright side is I have more torque and during acceleration car feels strong. It is still that backfiring in exhaust pipes!!!!!!!!!! I'm thinking my S&W 45 would put some fine venturis in the darn thing!!!!!!!!!!!!
I ordered the LM-1 Air /Fuel Ratio Meter. Not as though I know a rats a-- about that either!
Someone should go into business tuning webers. May save guys like me more money to fly them to the car than waist time and money fiddle farting with something I know little about. I'm just a parts changer and that is expensive.
Thank's
Jim
Last edited by race-it; 05-11-2009 at 12:45 PM..
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05-11-2009, 11:23 AM
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CC Member
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Join Date: Mar 2004
Location: miami,
FL
Cobra Make, Engine: E-M Cobra Ford FE 427 w/ Webers 48 IDA
Posts: 1,383
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Not Ranked
I like the NGK
It works for me |
05-11-2009, 01:34 PM
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Senior Club Cobra Member
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Join Date: Mar 1999
Location: Yuma, AZ / Whitefish, Mt.,
Posts: 483
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Not Ranked
Jim
I feel your pain, as I've been there and done that. My fix for my webers was to take them off install a Tunnel Wedge and sold the weber set up for one hell of a loss. Will be in the NW for a couple of days and then I'm heading to Alaska for a few weeks. I did bring my car back to the NW. Will be back in the area mid July so hope to get in some rides.
Fred
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05-11-2009, 01:46 PM
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CC Member
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Join Date: Mar 2004
Location: miami,
FL
Cobra Make, Engine: E-M Cobra Ford FE 427 w/ Webers 48 IDA
Posts: 1,383
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Not Ranked
Fred will you be selling your Webers / what model how much
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05-11-2009, 01:51 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
Quote:
Originally Posted by race-it
Someone should go into business tuning webers. May save guys like me more money to fly them to the car than waist time and money fiddle farting with something I know little about. I'm just a parts changer and that is expensive.
Thank's
Jim
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I would love to take you up on that offer, but with my luck I might not be able to find 'your' problem & you would make me walk home! 
__________________
Jac Mac
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05-11-2009, 02:41 PM
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Senior Club Cobra Member
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Join Date: Mar 1999
Location: Yuma, AZ / Whitefish, Mt.,
Posts: 483
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Not Ranked
Priobe
Sold them to another NWCC guy.
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05-11-2009, 02:48 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
In a close examination I found carbon coming from inside the four header pipes where they enter the collector on both sides. I will have to weld up all four pipes together up the sides to stop the leak. May be what is causing popping.
Fred, Nice to hear from you. Cant wait to see your car again.
JayMac, You mean a heck of a swim!!!!!!!!!!!!!!!!
Jim
Last edited by race-it; 05-11-2009 at 02:53 PM..
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