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Old 08-15-2008, 08:45 AM
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Gas consumption

Hi all,I have a 81 TA with a 305sbc,mild cam headers and dual exhaust,change the origanal carb to a edelbrock 600cfm carb last year,gas usage was ok then,This year seems to be burning more gas than usual.Any ideas?.Thanks all.

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Old 08-15-2008, 08:53 AM
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???

not a clue all of my experiance with edies were better milage and worse performance mabey just higher prices makin it look worse?? lol??
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Old 08-15-2008, 12:09 PM
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first question is which 600cfm Edie model?

1406 is set up for more for economy with .098 primary jets and "fat" 75/47 rods to restrict more flow thru the jet....

the other 600cfm model (1405?) is set up stock more for perfomance with something "like" (dang CRS!) .100jets and 70/37 rods(???)

at high Hg light gas pedal cruise, .098-.075=.023 wide "donut shaped hole" opening for gas to flow thru....

the other carb is .100-.070=.030 wide donut hole....

(the tuning charts in the manual save you the aggrevation of calculating the actual area of each donut to be able to make a flow percentage increase compare to each other)
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Old 08-15-2008, 01:02 PM
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I have the 1406 model
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Old 08-15-2008, 01:30 PM
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Quote:
Originally Posted by mcharger440
not a clue all of my experiance with edies were better milage and worse performance mabey just higher prices makin it look worse?? lol??
good point

or maybe the higher ethanol content? Plus I read elsewhere that some gas stations are mixing water?? I find that hard to believe.. they said it will mix due to the alchohol??
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Old 08-15-2008, 03:16 PM
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how weird!
I received your reply on 3 emails and all 3 said 1405....
thread says 1406....

very slim chance that your motor will like any leaner than the 1406 settings,,,,you will need to use more gas pedal to get the same amount of acceleration TQ

Suggestion????:
a pretty simple to do dynamic test for how well is the whole rotating system sealing and operating is rig a vac guage so you can read it while driving....

note that the Hg values given on this animated vac guages link are more correct for a stock camshaft

http://www.users.bigpond.com/ergoff/vac1.htm

first and foremost you want to see a almost rocky steady needle when it's static or while moving....
with a mild cam there should be 24Hg+ on a downshift if the rings and valves are sealing

while you've got the vac guage hooked up:

your old carb metering may have better matched your present timing total and made a higher Hg at hwy speed....
try adjusting your vacuum advance for more or less total timing to see if you can't get a higher Hg....
very very roughly each additional Hg on the hwy is worth up to 2mpg....

Last edited by red65mustang; 08-15-2008 at 03:27 PM.
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Old 08-17-2008, 11:38 AM
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E10 fuel knocks your mileage 6%, more or less, and usually makes the engine run worse.

Buy real gasoline. We have only 2 stations in the whole county with real gas.
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Old 08-17-2008, 02:45 PM
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Geese do ya think the price of gas has anything to do with it?

$20 at the pumps doesn't get you much gas these days.

The Qjet will be better on fuel than a edelbrock carb, hands down. If fuel economy matters, reintall the Qjet and tune it. 80% of the "tuning" of a Qjet for performance is done on the sec side of the carb. If after reintalling the Qjet and it drives, idles fine, all you need to do is dial in the secondarys for maximum performance equal or better than a edelbrock or holley on your 305.

If fuel economy matters more than performance then the factory Qjet intake manifold will probabily return better overall fuel economy then a aftermarket intake will.
If you have stock or near stock rear gearing and a OD trans, and the engine has a low (stock) compression ratio then a typical hi performance cam will return less fuel economy than a stock OEM 305 cam will.
LOW LOW rpm hiway cruising ( OD ) requires a small camshaft to be efficient at that low cruise rpm. Cams that make more power (have more duration and lift) than stock will be less efficient at that critical OD cruising rpm on the hyway.
Its very easy to over cam a mild near stock 305.
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