why would i only be getting 9 mpg? i just got my carb 650cfm tuned on my 383 magnum...i thought they got like 17 to 19 mpg?
2007-01-02 09:54:51 · 7 answers · asked by John M 2 in Cars & Transportation ➔ Car Makes ➔ Dodge
I had a '69 Plymouth Road Runner with the 383cid and an automatic transmission. The engine was completely stock including the Carter AVS four-barrel carburetor. It averaged 13mpg with the 3.55 ratio rear axle and 14mpg when I changed it to the 2.76 ratio. The worst mileage was 9mpg. The several 318s (5.2 L) I have owned, including all three generations of engines this size, averaged 15mpg. You may want to check to see if your speedometer/odometer is accurate. Tire/wheel sizes and axle ratios could have been changed in the past 37 years. I changed the speedometer pinion to compensate for the axle ratio change on my Road Runner.
2007-01-02 12:12:33 · answer #1 · answered by db79300 4 · 0⤊ 0⤋
67 charger with a 383 4barrel about 7mpg
2014-07-03 09:41:45 · answer #2 · answered by specialized3249 2 · 0⤊ 0⤋
Check the timing, including the vacuum advance.
Check for normal vacuum at idle.
Check spark plug gaps.
Verify that the carb is the correct size for the engine and verify correct float level.
Be careful how you drive it. Rapid acceleration = poor gas mileage.
2007-01-02 18:01:24 · answer #3 · answered by cranknbank9 4 · 0⤊ 0⤋
9 mpg is pretty good for that car/motor combo. That is a HUGE 8cyl motor in a very heavy car 9 mpg is good if you do not believe me look up the original specs for that car and you will see that 9 mpg is good for the General Lee.........
2007-01-02 18:04:34 · answer #4 · answered by crawler 4 · 0⤊ 0⤋
9 to 13 miles per gallon
2007-01-02 17:59:01 · answer #5 · answered by johnny 1 · 0⤊ 0⤋
I had a similar problem with my dads old pickup. My friend sent me this article, following it has helped me a grip, so- i hope it helps for you too! The comprehensive to-do list is at www.cargens.com
2007-01-04 05:32:11 · answer #6 · answered by Bbo F 2 · 0⤊ 0⤋
keep your foot out of it and putsy around or sell it to a gearhead that won't complain.
2007-01-05 21:51:51 · answer #7 · answered by mister ss 7 · 0⤊ 0⤋