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Author Topic:   Fuel economy?
MrWesson22
Gearhead

Posts: 610
From: Dacula, GA
Registered: Sep 2000

posted 03-18-2002 10:03 PM     Click Here to See the Profile for MrWesson22   Click Here to Email MrWesson22     Edit/Delete Message   Reply w/Quote
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!

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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

posted 03-19-2002 12:02 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
8-10 mpg,

SteveW

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kid vishus
Gearhead

Posts: 1994
From: huh?? what? who? ME!?!?!?!
Registered: Oct 2000

posted 03-19-2002 05:16 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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

posted 03-19-2002 07:04 AM     Click Here to See the Profile for MrWesson22   Click Here to Email MrWesson22     Edit/Delete Message   Reply w/Quote
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

posted 03-19-2002 07:04 AM     Click Here to See the Profile for wvcat   Click Here to Email wvcat     Edit/Delete Message   Reply w/Quote
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

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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

posted 03-19-2002 10:07 AM     Click Here to See the Profile for MrWesson22   Click Here to Email MrWesson22     Edit/Delete Message   Reply w/Quote
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?

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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

posted 03-19-2002 12:31 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
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

posted 03-19-2002 01:37 PM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
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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