I remember reading in the Mopar "Bible" that fuel economy and Horsepower TOGETHER is of no concern...LOL!! With that being said, it does seem that 6 mpg is a little gluttonous. Following to see what you find.
And I get 18-19 with my 273-4 barrel with a 650 AFB and a 3.23 on the highway.I drove 75 miles last Sunday and used 1/2 tank.
273 2bbl 3.23 gears 215 70 14 tires
3/4 of it was on the interstate at 75 mph
1/4 was on surface
Just over 9 mpg
Whata up guys !
A little update on the 64whiteghost aka my 1964 plymouth valiant.
Got my 340 running and broken in i havs about 150 miles left to hit the 500 miles. But i have one problem. Im getting 6 mpg
Im running an FST double pumper 750 with 67 jets. Idk what power valve yet. But im assuming it has the stock 6.5.
Motor: 340 .30 over
Cam specs: See photo. It is a custom cam and peak power is at 680p rpm
Cylinder heads: flow bench showed 235cfm
Rear: 8 3/4 3:73s with a posi
Im wondering if my 750 is too much. Power is crazy good and im happy with that. But my mpg is insane lol And im wondering if i need to go down to a 650 and if that would help.
Thoughts?
In wondering
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I agree completely about taking a look at the air bleeds first. For me though, I would be too chicken to change them out unless I could stuff a blue towel into the bores before pulling the bleed out to make sure it does not accidently drop into the butterflies... then I somehow jerk the throttle and let it through. Ugh!Bigger Air bleeds . More air less fuel. Easy to change on the road by removing the air filter. If you change over to removable style.
also square the carb so your not into the PV at idle. Idle off the secondaries and leave the primaries square
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Yup! Im in that group!I agree completely about taking a look at the air bleeds first. For me though, I would be too chicken to change them out unless I could stuff a blue towel into the bores before pulling the bleed out to make sure it does not accidently drop into the butterflies... then I somehow jerk the throttle and let it through. Ugh!
I agree completely about taking a look at the air bleeds first. For me though, I would be too chicken to change them out unless I could stuff a blue towel into the bores before pulling the bleed out to make sure it does not accidently drop into the butterflies... then I somehow jerk the throttle and let it through. Ugh!Bigger Air bleeds . More air less fuel. Easy to change on the road by removing the air filter. If you change over to removable style.
also square the carb so your not into the PV at idle. Idle off the secondaries and leave the primaries square
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Amen!!!Yup! Im in that group!
Me, I'm taking the carb off to do any work like that.
Paid way too much for the motor to risk something falling into it without me noticing and then ruin it for the sake of removing 4 nuts and some linkage.
Even after doing all thats recommend
If you are into the secondarys you will get chit mpg
LolI'm glad you guys are not working on my car
timing curve is wrong try 16 -20 initial, trial by pinging; all in by 2800 rpm
vacuum advance
195 thermostat
carb most likely is overjetted
What do your spark plugs look like?
Not the smiling version either. HahaEddie Murphy?
Whata up guys !
A little update on the 64whiteghost aka my 1964 plymouth valiant.
Got my 340 running and broken in i havs about 150 miles left to hit the 500 miles. But i have one problem. Im getting 6 mpg
Im running an FST double pumper 750 with 67 jets. Idk what power valve yet. But im assuming it has the stock 6.5.
Motor: 340 .30 over
Cam specs: See photo. It is a custom cam and peak power is at 680p rpm
Cylinder heads: flow bench showed 235cfm
Rear: 8 3/4 3:73s with a posi
Im wondering if my 750 is too much. Power is crazy good and im happy with that. But my mpg is insane lol And im wondering if i need to go down to a 650 and if that would help.
Thoughts?
Its is semi tuned correctly. But yes. Im looking into finding a shop that can dyno tune it correctly
Not a lot to go one, butMy timing is 10 initial and 34 advanced. I ordered a 4.5 power valve and im going to see what mpg i can get this saturday
they effect idle,jetting is where the consumption would be
At what rpm do you do 65 on the highway ?I’m thinking its two things it’s your timing you need more initial 15 initial and 14-16 mechanical
And carb double pumper equals 2 accelerator pumps which drinks gas. Also 67 jets that’s way too small I would think your engine would want 70s
I have a 68 340 10.5 compression also similar cam to yours it takes 16 initial and 14 mechanical I get 12-14 mpg 4 speed 3.55
Thank you !That's a great looking car!!