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Gas Mileage
#1
Took the Mustang to Yosemite for the annual Glacier Point star party.
This is the first long haul excursion for the new engine.
Car was packed with camping gear and astronomy equipment just like
last year. Same load and route. Only difference being the new
engine. Last Fall my 351C 4V developed a cracked block so we
installed a rebuilt 351C 4V long block purchased from Don of OMS.
Only real difference between the two engines is the carb and cam.
The new engine has a "mild" cam and bigger carb. Long story short,
last year I put 15 gallons in the tank at a station outside Yosemite
after topping off before leaving home. This year it took 10 gallons to
top off the tank at the same station. So 50% better mileage with the
new engine, cam and 100 cfm bigger carb. How do you explain that?

mike

[Image: 1_11_11_13_11_50_27.png]
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#2
goodnigh;85848 Wrote:Took the Mustang to Yosemite for the annual Glacier Point star party.
This is the first long haul excursion for the new engine.
Car was packed with camping gear and astronomy equipment just like
last year. Same load and route. Only difference being the new
engine. Last Fall my 351C 4V developed a cracked block so we
installed a rebuilt 351C 4V long block purchased from Don of OMS.
Only real difference between the two engines is the carb and cam.
The new engine has a "mild" cam and bigger carb. Long story short,
last year I put 15 gallons in the tank at a station outside Yosemite
after topping off before leaving home. This year it took 10 gallons to
top off the tank at the same station. So 50% better mileage with the
new engine, cam and 100 cfm bigger carb. How do you explain that?

mike

Your motor has more power and is more efficient...Same with my cousins trans am...It was a stock 400 pontiac motor.....It got about 14mpg....Its now a stroked and poked 465ci with 850cfm carb...pushing 504 Horse power at the rear tire...Long as he drives it normal...He now gets 21 mpg...lol Same gearing and rear end as the original....Long as your not a lead foot..Your motor using less gas to push the same mass....ohhh no...that rymedWink lol
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#3
hyena429;85856 Wrote:Your motor has more power and is more efficient...Same with my cousins trans am...It was a stock 400 pontiac motor.....It got about 14mpg....Its now a stroked and poked 465ci with 850cfm carb...pushing 504 Horse power at the rear tire...Long as he drives it normal...He now gets 21 mpg...lol Same gearing and rear end as the original....Long as your not a lead foot..Your motor using less gas to push the same mass....ohhh no...that rymedWink lol

And people complain about our gas guzzling smoke belching 40 year
old carsHuh I estimate I got around 18 mpg. This is overall travel
from sea level to 7500 feet with mixed highway and mountain roads.
That includes 300 pounds of gear (telescope alone weighs 130 lbs)
and a tank of gas.

mike

[Image: 1_11_11_13_11_50_27.png]
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#4
goodnigh;85910 Wrote:And people complain about our gas guzzling smoke belching 40 year
old carsHuh I estimate I got around 18 mpg. This is overall travel
from sea level to 7500 feet with mixed highway and mountain roads.
That includes 300 pounds of gear (telescope alone weighs 130 lbs)
and a tank of gas.

mike
Very true!! And funny thing is..All the low compression gas saving crap will all have better gas milage with bit higher compression and more cam lift."just cam lift some times is all they need"...I seen a high compression ford escort runing water injection into the carb...getting a amazing 50 too 60 mpg..Long as you wasnt a lead foot that isWink

130 pound scope....packing a nice dobsonion telescope up there?..I got a little 5 inch meade dob...But i need better eye peices still..lol..and im tring to film the moon with it a bit..but camera cant handle how bright it is...Im going to buy some proper moon filters...but i seen a guy online using 3d glasses from the movies and cutting them up...The modern style.."not the blue and red ones" hehe...Cutt them out and he made some good filters...im going to try it for a quick fix for now...lol
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#5
Wow 18 MPG - that is great.

All the fun and decent mileage to boot.

I have got to get my Mach 1 on the road.
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#6
Steven Harris;85931 Wrote:Wow 18 MPG - that is great.

All the fun and decent mileage to boot.

I have got to get my Mach 1 on the road.

I was thinking the same thing. 18 mpg from a fire breathing Cleveland!

Mike: What rear gear do you have? What was your cruising speed on the highway?

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#7
Running on the primaries of a 4 barrel and not letting the secondaries come in can produce some respectable numbers. Remember that CFM's refer to cubic feet of air per minute, not fuel.

A larger carb can allow more air to pass through it, but the jetting of the carb determines the amount of gas that will flow thru it.

Air is drawn thru the carb and a larger carb will not force any more air into an engine than a smaller one, nor will the air draw any more fuel. It can draw less due to decreased vacuum signal though.


Sounds like you have it in the sweet spot. Enjoy!

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#8
with my Stock 302 2 bbl carb 2100 I get a combined milage of about 17-20 MPG's, Not bad for a 40 yrs old car!!

[Image: 2zem9nk.jpg]
Iyman
1972 Mustang convertible run_horse  
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#9
hyena429;85928 Wrote:130 pound scope....packing a nice dobsonion telescope up there?..I got a little 5 inch meade dob...But i need better eye peices still..lol..and im tring to film the moon with it a bit..but camera cant handle how bright it is...Im going to buy some proper moon filters...but i seen a guy online using 3d glasses from the movies and cutting them up...The modern style.."not the blue and red ones" hehe...Cutt them out and he made some good filters...im going to try it for a quick fix for now...lol

Moon filters are not expensive and you do need one.
Bought the biggest Dob that would fit in the trunk of the
Grandé, a 10" 1200mm f/4.7 from Orion. Have had a couple
of "goto" scopes in the past but with less than adequate results.
So I settled on a decent Dob and learned how to star hop.
This last weekend it was partially cloudy near Half Dome so I
had a hard time aiming my scope without visible landmarks.
A properly polar aligned goto would have been better.
A fellow astronomer had a 5" apochromatic that was polar aligned
and you could see M31 (Andromeda galaxy) though the clouds.

mike

[Image: 1_11_11_13_11_50_27.png]
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#10
My car is about as stock as you can get except I have an aftermarket 4 barrel. It has a C-6. I get 12-13 on long trips and 10mpg otherwise. I do not drive it very hard but I do not hyper-mile either.

It is inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians.

Henrik Ibsen
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