Re: Horrendous fuel mileage
[Re: DrCharles]
#2758588
04/01/20 07:54 PM
04/01/20 07:54 PM
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Joined: Dec 2004
Posts: 10,555 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,555
Rittman Ohio
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Sounds about right to me My Savoy with a 493 ,620 cam and 3,54 gears, 1050 QF carb. gets about 40 miles on 15 gallons of fuel just normal driving with a couple of full throttle blasts. It really drinks the fuel on 100 MPH blasts. Gus 40/15 = 2.7 mpg So I am in the ballpark, at least for the "too much is just right" crowd. Oh well, I didn't build this toy for economy but I may need to get a bigger fuel cell! Yeah my wife always tell me "every time you drive that car it costs you $50 " Norwalk Raceway is about 45 miles from my house and the gauge is below E when I get there Going to put some 3.23 gears in the Dana and put an 800 Thunder series AVS carb on and see if I can get 50 miles out of a tank. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Horrendous fuel mileage
[Re: volaredon]
#2758601
04/01/20 08:24 PM
04/01/20 08:24 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
OP
master
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OP
master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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big block, big cam, double pumper..... geez what do you expect? From my original post: I suppose I shouldn't be surprised because big cams are not known for economy, but still... Since I got 8 to 15 mpg from a mild 383 with 3.23 gears, I figured 6 to 10 with this one. Well, I'd like to get 10 mpg on the highway at a steady 60, since I already know it cruises nicely at 15-15.5 AFR there. We shall see
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Re: Horrendous fuel mileage
[Re: DrCharles]
#2758632
04/01/20 09:38 PM
04/01/20 09:38 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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big block, big cam, double pumper..... geez what do you expect? From my original post: I suppose I shouldn't be surprised because big cams are not known for economy, but still... Since I got 8 to 15 mpg from a mild 383 with 3.23 gears, I figured 6 to 10 with this one. Well, I'd like to get 10 mpg on the highway at a steady 60, since I already know it cruises nicely at 15-15.5 AFR there. We shall see An overdrive would change your world. Spinning 451 cubes at 3,000rpm still requires a substantial amount of fuel to obtain 15-15.5 AFR, the shear volume of air you are pumping per minute is substantial. The amount of fuel you need to run at that rpm is probably what my little Hemi consumes at 100mph in 6th.
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Re: Horrendous fuel mileage
[Re: GoodysGotaCuda]
#2758634
04/01/20 10:04 PM
04/01/20 10:04 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
OP
master
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OP
master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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An overdrive would change your world.
Spinning 451 cubes at 3,000rpm still requires a substantial amount of fuel to obtain 15-15.5 AFR, the shear volume of air you are pumping per minute is substantial.
Well, sure, but I can buy a lot of pump gas for the $5-6k it would cost me to install one Especially since I'll probably only drive it a few hundred miles a year... Don't forget that the throttle is mostly closed (14" vacuum) and the VE is way down. It's not like the cfm is anywhere near what it is at WOT The amount of fuel you need to run at that rpm is probably what my little Hemi consumes at 100mph in 6th. Could be, it's a much more efficient and modern engine - although I don't know what body it's in (drag coefficient). My '72 Dart is not quite as aerodynamic as a brick but it's close
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Re: Horrendous fuel mileage
[Re: DrCharles]
#2758647
04/01/20 10:37 PM
04/01/20 10:37 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Well, sure, but I can buy a lot of pump gas for the $5-6k it would cost me to install one Especially since I'll probably only drive it a few hundred miles a year... Don't forget that the throttle is mostly closed (14" vacuum) and the VE is way down. It's not like the cfm is anywhere near what it is at WOT We've found than an OD is not nearly as much of a fuel saving idea as much as it helps you enjoy the car more than you think you could. We put a GV in a Lil Red Express, for about $3,000, and my father-in-law couldn't be happier. The fuel savings will never add up on paper, but the pure enjoyment it brings is worth it 10x over. It's much MUCH nicer to just get in an go somewhere, you don't feel the stress though the car as it screams down the road. You can carry on a decent conversation and make it to a reasonable destination without constantly monitoring the fuel gauge. It depends on your location, but here in Texas we can run 100-150mi round trips at 75-80mph to attend a decent car event, I do not miss the days of running 1:1 904 with 3.91s. That said, enjoy! I know my Warlock is good for about 250whp and gets about 8mpg, those trucks are barns on wheels...but I do have a a518 OD in the shed for it
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Re: Horrendous fuel mileage
[Re: dOoC]
#2758678
04/01/20 11:52 PM
04/01/20 11:52 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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Sounds about right to me My Savoy with a 493 ,620 cam and 3,54 gears, 1050 QF carb. gets about 40 miles on 15 gallons of fuel just normal driving with a couple of full throttle blasts. It really drinks the fuel on 100 MPH blasts. Gus 40/15 = 2.7 mpg So I am in the ballpark, at least for the "too much is just right" crowd. Oh well, I didn't build this toy for economy but I may need to get a bigger fuel cell! Sounds like WOT mpg on a Hellcat ! Well if the 11 minutes to a tank is right, I figure 1.98 mpg on a demon wide open at 200 mph, hellcat would get better.
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Re: Horrendous fuel mileage
[Re: DrCharles]
#2758682
04/02/20 12:28 AM
04/02/20 12:28 AM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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Last edited by Cab_Burge; 04/02/20 12:29 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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