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05-07-2006, 03:11 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
Weber issues - need opinions
When I rev the engine in the garage I have a pop in my sidepipes after about 2000rpm's. Maybe more on the driver side but the damn thing is so loud I really can't tell. What will cause this popping? I have sprayed carb cleaner around the intake but found no leaks. I think my fuel pressure is right at 2.5 and I think my timing is around 38 degs. This is a 408w.
idle jet 65
idle jet holder 120
primary jet 150
air correcter is 190
f7 tubes
50 exhaust valve and pump
37 venturi's
I am running rich around 11 to 12:1 A/F. That is not that far off. If that is the issue, what to change? That ratio is through the whole band.
The car runs pretty good already but I really hate to do to much road testing since it is not exactly legally registered yet. 
__________________
High Maintenance Racing Team
Run & Gun 2003 - 2013 
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06-14-2007, 06:41 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
What did you determine was at fault?
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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06-15-2007, 04:13 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 went to f16 tubes and corrected some carb balance issues. I got your PM, just haven't had time to get back to you but the chokes are OEM.
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High Maintenance Racing Team
Run & Gun 2003 - 2013
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06-15-2007, 05:49 AM
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CC Member
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Join Date: Feb 2006
Location: Glenwood Landing or Southampton,
NY
Cobra Make, Engine: Superformance, FRP460 Big Block
Posts: 975
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Not Ranked
I assume you have 48 IDAs?
Popping usually means too rich; as opposed to sneezing, which would mean lean.
When this occured with my setup, I went lean on the idle jets (55s) and disconnected the distributor vacuum advance. Timed it to 38 deg. max and she's running great. Just a bit fat at idle but the transition is smooth and response immediate. You may want to go to the next smaller size idle jets, 60's maybe.
edit: This was on the GT40 w/ 302.
__________________
Ray
New York
SPF#1052 11mpg
CAV GT40 MONO29 9mpg
'94 35th Anniversary Rover Mini Cooper 32mpg
'01 MB CL600 V12 18mpg
'08 Volvo S80 18mpg
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