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08-16-2007, 02:38 PM
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CC Member
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Join Date: Aug 2007
Cobra Make, Engine:
Posts: 4
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Not Ranked
New Crate GT-40 Webers Carb setup
Pleased to find your CC site.....here goes 1st post
Im running a Crate GT40 T56 6 speed and have prob with the low end off idle
with my IDF48's on base setting idle is fair except when temps are running hot then it becomes rather crappy. I then get backfiring through the stacks off & on untill I reach approx 2500-2800 & then it pulls steady & smooth.
I'm still reading all the redline/Inglese stuff but was wondering if anyone has been through htis in hopes you might recommend idle jet sizes along with any other help . much appreciate any adv Sincerely bmace
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08-18-2007, 06:52 AM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Quote:
Originally Posted by bmace
Pleased to find your CC site.....here goes 1st post
Im running a Crate GT40 T56 6 speed and have prob with the low end off idle
with my IDF48's on base setting idle is fair except when temps are running hot then it becomes rather crappy. I then get backfiring through the stacks off & on untill I reach approx 2500-2800 & then it pulls steady & smooth.
I'm still reading all the redline/Inglese stuff but was wondering if anyone has been through htis in hopes you might recommend idle jet sizes along with any other help . much appreciate any adv Sincerely bmace
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is your cam Weber friendly?
Z. Ray
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'65 K code Mustang
'66 Galaxie 500
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08-18-2007, 09:55 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: 4,161
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That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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08-19-2007, 09:25 AM
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Quote:
Originally Posted by Brent Mills
That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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Sorry.....idle jets are 55ml,air corr 180m, main 150m, chokes 40m
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08-22-2007, 04:16 AM
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CC Member
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Join Date: Oct 2001
Location: Linkenheim,
BW
Cobra Make, Engine: Sorry "just" a 68 Shelby GT500
Posts: 90
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I would recomend gtting a wide band o2 sensor setup, like the Innnovate LC-1.
It takes away most of the rich lean guessing and allows you to pinpoint the sources of drivability issues.
Do you have the 3rd transition hole drilled ? On my setup it made a world of a difference.
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Mike
68 GT 500
(Germany)
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08-22-2007, 11:28 PM
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CC Member
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Quote:
Originally Posted by 68gt500
I would recomend gtting a wide band o2 sensor setup, like the Innnovate LC-1.
It takes away most of the rich lean guessing and allows you to pinpoint the sources of drivability issues.
Do you have the 3rd transition hole drilled ? On my setup it made a world of a difference.
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68GT500
Pardon my ignorance..........pls explain "drilling 3rd transition hole" thks bmace
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08-23-2007, 05:54 AM
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CC Member
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Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
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Quote:
Originally Posted by Brent Mills
That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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Brent,
do you know the cam spec parameters for using Webers ?
thanks,
Z. Ray
__________________
'65 K code Mustang
'66 Galaxie 500
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08-27-2007, 09:47 AM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Evans,
CO
Cobra Make, Engine: NAF 289 FIA, 347 stroker with Weber 48's, building a '48 Anglia gasser, driving a '55 Chevy resto-rod
Posts: 3,119
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Ideally a 50/50 camshaft is recommended. Not to say that if you have a "hot" cam with a lot of overlap, a thumpty-thump sound when at idle, that Webers won't work, they'll just be a PITA to get into tune and run properly though if it is a "radical" cam as some people run you may never get Webers tuned up.
I have a 289 with a mild cam just slightly hotter than stock and Webers.
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"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
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08-27-2007, 09:59 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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40 chokes are too big for a small block,go with 37's max, this should help your low end and off idle characteristics
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SPF Daytona coupe 055, Roush 427R
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08-27-2007, 10:15 AM
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CC Member
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Join Date: Sep 2000
Location: Brownsville,
CA.
Cobra Make, Engine: Superformance, #930, 351W/427CID 419 RWHP (before the Webers!)
Posts: 224
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Would you think 40s are too big if the SB is stroked to 408 or 427?
Tks
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Terry Brown SPF #930 427W 419 RWHP 48 IDA Webers
"Remember, your car will not be more valuable after Track Day than it is the day before the event" - Eric W. instructional presentation on Track Day safety, 05/15/2008 WSCB
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08-30-2007, 05:49 PM
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Quote:
Originally Posted by ENTDOC
40 chokes are too big for a small block,go with 37's max, this should help your low end and off idle characteristics
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Thks Entdoc for the choke adv. I agree as local weber gurus
have mentioned similar ideas. much appreciate you input.
Sincerely
bmace
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08-30-2007, 06:40 PM
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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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Terry, 40's may be fine for those applications at least for the 427 stroker. Many feel 40's are too big for even a stroked 427so,that has not been my experience at all and seems to cure the over rich situation . I do think they are too big for 302's however.
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SPF Daytona coupe 055, Roush 427R
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