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| mpg with 4bbl carb https://slantsix.org/forum/viewtopic.php?t=44041 |
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| Author: | moparman55 [ Mon Mar 14, 2011 5:07 pm ] |
| Post subject: | mpg with 4bbl carb |
I was wondering what would my mpg be like if i switched to a 390 cfm holley i have a 1974 gold duster pretty much stock except it has hooker headers, 2.5" exhaust with glasspacks and a clifford intake with a 2bbl on it right now but i dont care for it so i was wondering what the gas millage would be like if i switched to the 390 holley, and how reliable would it be all together because i would like it to be my daily driver its got 73,000 miles and has lived a fairly easy life |
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| Author: | SlantSixDan [ Mon Mar 14, 2011 5:23 pm ] |
| Post subject: | |
Exactly what are you hoping to achieve? What do you mean by "I don't care for it"? |
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| Author: | 1974duster kev [ Mon Mar 14, 2011 5:30 pm ] |
| Post subject: | |
I ran a 390 on my daily for a few years with no big issues. Kev |
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| Author: | moparman55 [ Mon Mar 14, 2011 5:30 pm ] |
| Post subject: | |
well basicly im looking for a little more power at least more than stock and the 2bbl im having vacuum issues and its too tall for an air cleaner unless i want to make one myself and im just curious on mpg and drive-ability |
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| Author: | ceej [ Mon Mar 14, 2011 5:35 pm ] |
| Post subject: | |
The best mileage I got with the Hooptie (74 Valiant) was while the engine was stock, running a Feather Duster 2-1/4" and a Holley 390. The distributor was recurved to work with the four barrel. I peaked at about 24 mpg freeway. There was a lot of messing about with the 390 to make it work. Pretty much everything had to be adjusted, tweaked, and played with to get it working. My engine made 8.0:1, which is bare minimum to work. It did not perform as well as most of the 2 bbl cars of like build. I would seriously think about getting some more compression at a minimum. 9:1 or a tad better will go a long way to making things work better with the 4 bbl. You will want to have a vacuum gauge, a tach, and if possible some form of A/F gauge to tune with. Even if it isn't terribly accurate, you will be able to use it qualitatively if not quantitatively for getting all the circuits working right. CJ |
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| Author: | 65CrewCabPW [ Tue Mar 15, 2011 10:35 am ] |
| Post subject: | |
I had a 78 D150 with oversized tires, 3.55 gears, a 4 speed, and isky cam and offy manifold, and I ran a 625 AFB carter on it. it was good for low 20's on the highway, and about 18 if you didn't have to drive in town a bunch, but was point to point running - a country commute. Decent mileage CAN happen, but it won't happen by accident, usually 
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| Author: | mikeysmopar [ Wed Mar 16, 2011 11:48 am ] |
| Post subject: | |
I have a aspen that is a street strip car runs in the 14teens it got 16 mpg on the power tour for the week average |
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| Author: | DusterIdiot [ Wed Mar 16, 2011 6:15 pm ] |
| Post subject: | Yep... |
Depending on build and rear ratio/tranny/vehicle weight/driving style, you could make OK mileage... Best with my Hpak motor with the smaller cam was 26 mpg Seattle and back. Last rendition with the Erson 280/270 cam and 3.55's (A-833OD) was about where Ceej was 24mpg (long shot 99% highway Medford to Albany gas station). -D.idiot |
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| Author: | coconuteater64 [ Wed Mar 16, 2011 8:18 pm ] |
| Post subject: | |
My D100 with the stock 1 bbl and dual cats got about 15 highway and 11-13 city depending on how much of a hurry I was in. Now it has dual Dutra duals, 2 1/4" pipe, and a Holley 350 carb and it seems to get 15 mpg city or highway, and has a ton of power it never had. I'm sure when I jet it down a bit it'll get much better mileage than it does now. Not really a fan of a 4 bbl on such a small engine, but it's your car, and some others have had great success with it. If you're willing to fiddle around with it, not necessarily a bad thing. Your opinion may vary. |
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| Author: | kesteb [ Wed Mar 16, 2011 9:57 pm ] |
| Post subject: | |
My '65 Dart with the Edelbrock 500 AVS and a stout engine with 3.5 gears, 4 speed and 26" rear tires was getting 14.5 in commuter traffic from south Everett to Bellevue down 1-405. This was without the vacuum advance hooked up. It is now getting around 17 mpg with it hooked up. I have no idea on what it would get on a straight run down the freeway. I do know that I ran from Ocean Shores on the Washington coast to home on less then 3/8 of a tank, and this was with a badly adjusted carburetor. I do know that an educated right foot gets better gas mileage then the uneducated one. |
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