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CC Advertisers
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09-19-2007, 09:21 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: 1,380
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Not Ranked
BB Weber fuel economy
I was wondering what you guys are getting for fuel economy with a big block 427 and webers.
Just curious  |
09-19-2007, 09:23 AM
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CC Member
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Join Date: Apr 2000
Location: Leesburg, VA USA,
VA
Cobra Make, Engine: Contemporary, 427 FE Center Oiler w/ 48 IDA Webers
Posts: 238
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Not Ranked
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09-19-2007, 10:26 AM
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CC Member
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Join Date: Aug 2006
Location: Jersey Shore,
NJ
Cobra Make, Engine: Superformance SPF#2572, 427 S/O 2X4
Posts: 379
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Not Ranked
Bid block and fuel economy are two words you usually do not see in the same sentence.
__________________
Peace through superior firepower...or is it horsepower? Either way, more is always better!
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09-19-2007, 12:27 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: 1,380
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Not Ranked
Just Curious
Not that I am looking for a fuel saver just wanted to know.
I could see from the responses that my car must be running perfect!!!!  |
09-19-2007, 12:33 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
Since I am going in the same direction I was kinda of wondering the same, but its not something that will change my mind. Another question that comes to mind is what kind of HP will you see? Again it really doesn't matter as it won't change the swap over but it would be nice to know.
Fred
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09-19-2007, 12:50 PM
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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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Not Ranked
Quote:
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Originally Posted by Fred Hamilton
Since I am going in the same direction I was kinda of wondering the same, but its not something that will change my mind. Another question that comes to mind is what kind of HP will you see? Again it really doesn't matter as it won't change the swap over but it would be nice to know.
Fred
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Fred, the universal assertions are that your torque will be the primary beneficiary. You'll notice the difference. You will be a good gauge for the seat of the pants measure, as you are making the switch with an engine you are intimately in tune with.
As for gas mileage....there's enough gas stations around that I've never run out.  |
09-19-2007, 02:25 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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Not Ranked
12mpg witht he 750 demon about 10.5 with webers
__________________
SPF Daytona coupe 055, Roush 427R
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09-20-2007, 11:03 PM
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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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Not Ranked
Quote:
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Originally Posted by priobe
I was wondering what you guys are getting for fuel economy with a big block 427 and webers.
Just curious |
Not quite 427 & Cobra but 428 & Shelby:
Relaxed highway driving (70-90 mph)
Holley 750 (3310) 16-17 mpg
Holley 850 DP 14-15 mpg
48 IDAs (tuned by an "expert"  ) 8-9 mpg
48 IDAs 13-14 mpg (my current - not yet perfect tune)
The leaner tune runs much , much better than the "expert" and also noticeable better than the Holleys.
I expect the Webers to do as well or better than the 3310, after I find a way to reconnect the vacum advance.
At $2 per Liter (3.78l / gal)  I do care.
__________________
Mike
68 GT 500
(Germany)
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09-21-2007, 07:43 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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Not Ranked
3mpg, even with 42 gallon tank, have run dry twice:
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09-21-2007, 07:47 AM
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Banned
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Join Date: Oct 2003
Location: Yorba Linda,
CA
Cobra Make, Engine: SPF w/392CI stroker
Posts: 3,293
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Not Ranked
[quote=Full Throttle Al] 3mpg, even with 42 gallon tank, have run dry twice:
What make's this even funnier is that in this day of "green" this and "green" that, Al's car IS green!
Oh yeah...and gorgeous.
-Dean |
09-21-2007, 08:46 AM
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CC Member
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Join Date: Dec 2006
Location: Georgetown,
TX
Cobra Make, Engine: KMP 210 / CSX 4323
Posts: 61
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Not Ranked
6 mpg with mine (427/48's)
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10-22-2007, 01:27 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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Not Ranked
Quote:
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Originally Posted by 68gt500
Not quite 427 & Cobra but 428 & Shelby:
Relaxed highway driving (70-90 mph)
Holley 750 (3310) 16-17 mpg
Holley 850 DP 14-15 mpg
48 IDAs (tuned by an "expert" ) 8-9 mpg
48 IDAs 13-14 mpg (my current - not yet perfect tune)
The leaner tune runs much , much better than the "expert" and also noticeable better than the Holleys.
I expect the Webers to do as well or better than the 3310, after I find a way to reconnect the vacum advance.
At $2 per Liter (3.78l / gal) I do care. |
Update on the tuning & "fuel economy"
The last couple of weekends were filled with nice drives to car shows.
The mileage has stabilized at 16mpg. Not too bad considering that the vacuum advance is still not hooked up.
Seems the Webers have a build in choke, I have noticed that the car runs noticeably richer when cold and leans out as temperature increases.
With temperatures arround freezing the drive back from the show on Saturday was a pretty frosty experience ... (should have replaced the heater core in the summer)
__________________
Mike
68 GT 500
(Germany)
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