500 Cubic inch MPG

grubby65 · May 23, 2018

SlinktRR said:
do you still have the 850 edelbrock carb?

Yep, It’s for sale. 1year old.

Paul_G · May 23, 2018

Dennis H said:
I can get mid teens babying it. Gonna add vacuum advance. Want to increase range beyond 200 miles on a tank.

Make sure you get an adjustable advance can. If it starts to knock when cruising you may need to limit how much vacuum advance it gets. Also lean out your idle mixture as much as the engine will allow for best MPG.

not so famous bob · May 24, 2018

grubby65 said:
Previously I had submitted a post concerning the addition of a Holley Sniper FI unit to my 1964 Dodge Polara 500. The question was asked at to what kind of fuel mileage I was getting with the car. So I decided to start keeping track of it. I knew the speedometer was off substantially so I did a couple of tests to determine the extent of error. The first was a 10 mile test using the odometer of the car and mile markers along the road the other involved a direct comparison between the speedometer and GPS speed. The calculations showed the speedometer was off by 1.23. Here are some of the specifics for the car:

3.54 gears, P295/55 -15 ET Street SS tires

500 cubic inch stroker (400 block)

ProComp CNC ported Aluminum heads 325 CC intake runners

Heads flow 330 cfm intake, 250 cfm exhaust @ 28"

Harlan Sharpe, roller tip, 1.5 ratio rockers

230/236 @ .050", .550" lift Comp Roller Cam

Torker Intake (Ports opened up to match heads)

TTI Headers, 1 3/4" Primary, 3" collectors

1800 RPM stall, the motor is a torque monster.

9-1 Compression

MSD 6AL box and distributor

TTI 2 1/2" X-Pipe Exhaust

The tests were done basically driving to work which is a 25 mile trip through rural Nebraska so not much stop and go driving. I tried to maintain 60-65 mph. Here are the results:

1) 4/20/18 9.1 mpg (3 or 4 full throttle blasts)
2) 5/8/18 10.1 mpg (the best grandma driving I could do)

View attachment 603937

I found this very interesting. I`m running a bigger solid street roller, 1/6 rockers,raised port heads that flow more, FAST 2.0 fuel inj., 3;73 rear gear, 295 65 15 drag radials, 727 w/ loose 3500/3800 convertor. I haven`t got around to checking yet, but feel its about the same . ??? not sure! Initial timing at 22, I do need to raise my total cruise timing , running it now at 42/no load. Going to raise it to about 50. Only have about 400/500 miles on it .
3270 pounds. -------bob

SlinktRR · May 25, 2018

rumblefish360 said:
Fixed

haha yes, nevermind. Wishful thinking on my part! I already run the 800

500 Cubic inch MPG

grubby65

Well-Known Member

Paul_G

Well-Known Member

not so famous bob

Well-Known Member

SlinktRR

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