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Re: Horrendous fuel mileage [Re: DrCharles] #2758588
04/01/20 07:54 PM
04/01/20 07:54 PM
Joined: Dec 2004
Posts: 10,550
Rittman Ohio
fourgearsavoy Offline
I Live Here
fourgearsavoy  Offline
I Live Here

Joined: Dec 2004
Posts: 10,550
Rittman Ohio
Originally Posted by DrCharles
Originally Posted by fourgearsavoy
Sounds about right to me shruggy 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 beer


40/15 = 2.7 mpg eek
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 up 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 " shruggy Norwalk Raceway is about 45 miles from my house and the gauge is below E when I get there drive
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 beer

23231224_1750435168331817_8297307229037431265_n.jpg

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: Horrendous fuel mileage [Re: fourgearsavoy] #2758592
04/01/20 08:08 PM
04/01/20 08:08 PM
Joined: Jan 2008
Posts: 2,196
ILLINOIS
V
volaredon Offline
top fuel
volaredon  Offline
top fuel
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Joined: Jan 2008
Posts: 2,196
ILLINOIS
big block, big cam, double pumper..... geez what do you expect?

Re: Horrendous fuel mileage [Re: volaredon] #2758601
04/01/20 08:24 PM
04/01/20 08:24 PM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline OP
master
DrCharles  Offline OP
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Posts: 4,220
West Plains, MO
Originally Posted by volaredon
big block, big cam, double pumper..... geez what do you expect?


From my original post:
Quote
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 wink

Re: Horrendous fuel mileage [Re: DrCharles] #2758632
04/01/20 09:38 PM
04/01/20 09:38 PM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

Joined: Nov 2004
Posts: 25,050
Texas
Originally Posted by DrCharles
Originally Posted by volaredon
big block, big cam, double pumper..... geez what do you expect?


From my original post:
Quote
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 wink


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.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Horrendous fuel mileage [Re: GoodysGotaCuda] #2758634
04/01/20 10:04 PM
04/01/20 10:04 PM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline OP
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DrCharles  Offline OP
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West Plains, MO
Originally Posted by GoodysGotaCuda


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 whistling
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 work

Quote
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 smile

Re: Horrendous fuel mileage [Re: DrCharles] #2758647
04/01/20 10:37 PM
04/01/20 10:37 PM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

Joined: Nov 2004
Posts: 25,050
Texas
Originally Posted by DrCharles

Well, sure, but I can buy a lot of pump gas for the $5-6k it would cost me to install one whistling
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 work




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 biggrin


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Horrendous fuel mileage [Re: dIc dOc Deity !] #2758678
04/01/20 11:52 PM
04/01/20 11:52 PM
Joined: Jan 2003
Posts: 1,908
Nebraska
4
4406bbl Offline
top fuel
4406bbl  Offline
top fuel
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Joined: Jan 2003
Posts: 1,908
Nebraska
Originally Posted by Doc Fiberglass
Originally Posted by DrCharles
Originally Posted by fourgearsavoy
Sounds about right to me shruggy 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 beer


40/15 = 2.7 mpg eek
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 up 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.

Re: Horrendous fuel mileage [Re: DrCharles] #2758682
04/02/20 12:28 AM
04/02/20 12:28 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Work on the AFR so you can get from 14.3 to 15.5 AFR at light throttle cruising under 2500 RPM and see how much that improves the gas consumption on the highway when cruising twocents wrench up
I like to see from 12.8 to 13.3 at WOT(full street exhaust system 3.0 pipes to the rear bumper) on our local pump gas with no ethanol in it up

Last edited by Cab_Burge; 04/02/20 12:29 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Horrendous fuel mileage [Re: DrCharles] #2759038
04/02/20 06:01 PM
04/02/20 06:01 PM
Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
T
TC@HP2 Offline
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Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
Hmmm, my Volare had a 11:1 360 with a way too big cam and a big carb. When I went to the track, I'd put 5 gallons of race gas in it. I could make 3 warm up passes, make 3-4 round passes. Of course for every 1/4 mile pass there was the 1/4 mile back to the pit stall. Roughly 3-4 miles put on it a day. I'd have a small splash of gas left over. So roughly 5 gallons to go 3 miles at 6000 rpm comes out to about .6 mpg.

Could be worse.

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