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Author
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Topic: Fuel economy?
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MrWesson22
Gearhead Posts: 610
From: Dacula, GA
Registered: Sep 2000
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posted 03-18-2002 10:03 PM
   
The 69 is going to pressed into daily driver duty for a couple months (I know, I know...) until I get something else. I'm expecting atrocious gas mileage, but the carb will help. Any guesses on how bad it'll really be?351C 4V quench heads, 10.8:1. Edelbrock torker intake, holley 770 street avenger carb, comp cams solid - 282/288 244/252 .590/.600 108LSA. This is in a 69 coupe with a 4sp and 3.00 gears (yuck - very, very temporary). I'm thinking the cam and heads will kill the mileage, but the carb and gears will help.
I'm trying to calculate how much I really will be spending on gas every week. So, what's the verdict?? Any predictions? Thanks! ------------------
Neal
Member #723
[email protected] AIM: MrWesson22 69 Gulfstream Aqua Grande
351C/Toploader 4sp
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steve'66
Gearhead Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-19-2002 12:02 AM
8-10 mpg,SteveW
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kid vishus
Gearhead Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000
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posted 03-19-2002 05:16 AM
I agree with Steve 8-10. That tall gear will help you on the hwy, but will make it worse in town.
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MrWesson22
Gearhead Posts: 610
From: Dacula, GA
Registered: Sep 2000
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posted 03-19-2002 07:04 AM
I was thinking 8-9, so I guess I was right on par. What can I expect when I get my 4.11s? I'm thinking 7-8.
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Neal
Member #723
[email protected] AIM: MrWesson22 69 Gulfstream Aqua Grande
351C/Toploader 4sp
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wvcat
Journeyman Posts: 88
From: New Cumberland,WV
Registered: May 2001
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posted 03-19-2002 07:04 AM
In wvcat I get 12 mpg with a 357w dart sr's and a big cam but I also have an AOD. I'm running 3:73's with 275/60/15's too. I think you will end up in the same neighborhood.
John------------------
Thanks
John
(wvcat)
http://www.geocities.com/wvxr7cougar/wvcat_01.html?989286238390
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MrWesson22
Gearhead Posts: 610
From: Dacula, GA
Registered: Sep 2000
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posted 03-19-2002 10:07 AM
I got about 10-11 on the old combination - same basic idea, but no work on the heads and a mild hydraulic cam. I do have a bit of a lead foot of course -- why else would I build an engine like this to begin with?  ------------------
Neal
Member #723
[email protected] AIM: MrWesson22 69 Gulfstream Aqua Grande
351C/Toploader 4sp
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Hemikiller
Journeyman Posts: 62
From: Clinton, CT
Registered: Feb 2002
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posted 03-19-2002 12:31 PM
I used to get 18 highway with my '71 Mach with 351C-4V 10.5:1, Motorsport 214/224-.510/.536 hydraulic, and 3.00 gears, 4 speed. Switched to 3.70's, got 12-13, 3.91's, got 10...maybe. May mess with a T-5 on my next round of mods......
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TomP
Gearhead Posts: 3609
From: Delta BC Canada
Registered: Dec 99
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posted 03-19-2002 01:37 PM
the lead foot will get you poor mileage in any car.The lower gears won't hurt that much if the engine is running at very little throttle opening.
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