horrible gas mileage.
#1
horrible gas mileage.
Just finished my truck. Has a 4bbl 360. I put a 650 cfm edelbrock performer on it. I get absolutely horrible mileage. Is it too big for my small block? Do I need to jet it down? Any help would be nice. Cannot afford 100 bucks a week on gas. My other 360 did way better.
#2
#3
50 liters of gas got me around 75-100 kms in town. the engine is stock. 727 4x4. Stock size tires. About 4 inches of lift. No vacuum leaks. Went over it with a fine tooth comb. Maybe I need to jet it down? I live in southern Alberta. So with that elevation and stuff do I need to work on it? Thanks for the quick reply.
#4
that part of the problem right there. if all you did was city driving your gas mileage will suck. i get about 9mpg or worse if all i do is city driving with either of my 318's. 3.5-5mpg is definitely low. there is actually an active thread over on RCC that is talking about carbs. i think most people said that a 650cfm is about the max you want to run a on 360.
http://ramchargercentral.com/vehicle...arb/?topicseen
http://ramchargercentral.com/vehicle...arb/?topicseen
#5
that part of the problem right there. if all you did was city driving your gas mileage will suck. i get about 9mpg or worse if all i do is city driving with either of my 318's. 3.5-5mpg is definitely low. there is actually an active thread over on RCC that is talking about carbs. i think most people said that a 650cfm is about the max you want to run a on 360.
http://ramchargercentral.com/vehicle-help/small-cfm-carb/?topicseen
http://ramchargercentral.com/vehicle-help/small-cfm-carb/?topicseen
It down and stuff to help with the economy. It runs really really strong, but I keep my foot out of it. I've never had that bad mileage with any truck I've owned. My Ramcharger, my singlecab short box all had 4bbl carbs and 360. should I just call the edelbrock guys and ask what should be done? Thank you much.
#6
i guess you could call up edelbrock and ask. i just noticed he found a 500cfm carb and he did a small right up on it. apparently the 500cfm one works better than the 650cfm one.
http://ramchargercentral.com/technic...-cfm-the-test/
http://ramchargercentral.com/technic...-cfm-the-test/
#7
I have an old Carter AFB on my '72, with a 318, and I get about 11 around town and 12 on the freeway with it (with monster 39's, 4.10's, and a 4spd) . Problem is I have no idea what size the carb is. I imagine maybe 550 or 600 cfm, but I really don't know.
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#9
My grandfather, being a carb guru, is ordering me some rods, springs, and jets just incase, and we will play with the setups. We will set the timing back to right degrees. I also have a lose u-joint. We will get that all done asap. Thanks for the info guys. I really appreciate it. I might take off the brushguard cause it's heavy as hell. That might help. I'll get my headers and exhaust done then it'll be better I think.
#10
Long tubes also help with fuel economy. Make sure your exhaust isn't too big. I have 2" duals, no crossover, with 32" (i think) thrush glasspacks right before the exit.
Last edited by Wombat Ranger; 05-26-2012 at 05:17 PM.