Slant Six Forum :: Eileen will be stepping aside.

Exactly- IF you take all the necessary steps and make the appropriate sacrifices. Like an efficient cam, overdrive, etc. You cannot (trust me!) just bolt a 440 Magnum in front of some tall gears with a non-lockup 727 in a 4000-lb brick and get 20 MPG. You can have a boatload of FUN, have Honda-crushing astounding reliability, and spend very little up front with no risk at all of an undriveable combination... but not while getting better than 15.

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How about a 69 Charger with a rebuilt 440 driving from VA to the Nats in Columbus, down the track a couple of times, back and forth to the motel and back to VA. Kept close track of fuel consumption and mileage and it knocked down 19 MPG for the trip. Conversely, a friend drove my 71 318 Challenger convert, no track time and 18 MPG for the trip. Both with 2.76 gears.

Quote:

How about a 69 Charger with a rebuilt 440 driving from VA to the Nats in Columbus, down the track a couple of times, back and forth to the motel and back to VA.

Conversely, a friend drove my 71 318 Challenger convert, no track time and 18 MPG for the trip. Both with 2.76 gears.

Last week while my Dart has been down, (getting a new aluminum manifold), I drove my 69 Chrysler 300, 375 HP 440 with 2.76 rear end back and forth to work two days for 250 miles, and it got 19.5 mpg and it is cold as heck up here and snowing!

What cam, and what were the times? I already said that I've seen similar (or better) mileage with a mild-cam New Yorker 440 in a C-body, so that's not really a surprise in a lighter and significantly slicker B-body. But since I own a bone-stock 440 Magnum in a '69 Coronet R/T (in excellent tune, BTW), I know firsthand that such mileage is impossible with the Magnum engine in a B-body.

Author:	argentina-slantsixer [ Wed Dec 26, 2007 3:01 pm ]
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so maybe we can get benefits of brennan's path and start a thread of what it would take to build A) a hot street car while retaining some mileage B) a weekend race car that would be able to be daily driven and get "decent" mileage and street performance C) what it would take to bring the slant (or other old motors) into new efficiency and performance standards (yeah, it's time for the aluminum head thread of this upcoming year! hehehe)

Author:	66aCUDA [ Thu Dec 27, 2007 7:06 am ]
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Jaun Why dont you post your formula. I think (if its the one you sent me) it is worth a general discussion. Who knows maybe some small improvements can be made. By the way I still am planning that build soon. Thanks Frank

Author:	65 dartman [ Thu Dec 27, 2007 4:58 pm ]
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Quote: Exactly- IF you take all the necessary steps and make the appropriate sacrifices. Like an efficient cam, overdrive, etc. You cannot (trust me!) just bolt a 440 Magnum in front of some tall gears with a non-lockup 727 in a 4000-lb brick and get 20 MPG. You can have a boatload of FUN, have Honda-crushing astounding reliability, and spend very little up front with no risk at all of an undriveable combination... but not while getting better than 15. How about a 69 Charger with a rebuilt 440 driving from VA to the Nats in Columbus, down the track a couple of times, back and forth to the motel and back to VA. Kept close track of fuel consumption and mileage and it knocked down 19 MPG for the trip. Conversely, a friend drove my 71 318 Challenger convert, no track time and 18 MPG for the trip. Both with 2.76 gears.

Author:	Bren67Cuda904 [ Thu Dec 27, 2007 5:07 pm ]
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Quote: Quote: Exactly- IF you take all the necessary steps and make the appropriate sacrifices. Like an efficient cam, overdrive, etc. You cannot (trust me!) just bolt a 440 Magnum in front of some tall gears with a non-lockup 727 in a 4000-lb brick and get 20 MPG. You can have a boatload of FUN, have Honda-crushing astounding reliability, and spend very little up front with no risk at all of an undriveable combination... but not while getting better than 15. How about a 69 Charger with a rebuilt 440 driving from VA to the Nats in Columbus, down the track a couple of times, back and forth to the motel and back to VA. Kept close track of fuel consumption and mileage and it knocked down 19 MPG for the trip. Conversely, a friend drove my 71 318 Challenger convert, no track time and 18 MPG for the trip. Both with 2.76 gears. YAA What he said

Author:	Aggressive Ted [ Thu Dec 27, 2007 5:59 pm ]
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Last week while my Dart has been down, (getting a new aluminum manifold), I drove my 69 Chrysler 300, 375 HP 440 with 2.76 rear end back and forth to work two days for 250 miles, and it got 19.5 mpg and it is cold as heck up here and snowing! Several guys, at least 6 that I have met and talked to up here that race at SIR (Seattle International Raceway) will take a 70's Dart, drop in a stock 375 HP 440 bone stock with a Schmacher kit (motor mounts and headers) and cut 12.5 second passes, one right after another......some aren't even very good launches. That is with a basic tune up, and no after market goodies..... Then drive the car all week and get 20 to 22 mpg. That is with a stock AVS and a 2.76 rear end. The motor hardly revs up, it is just torqey and quick. They can't push on the gas too hard because a stock Dart will twist too much and the tires don't last long.

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Author:	Bren67Cuda904 [ Thu Dec 27, 2007 7:12 pm ]
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Author:	argentina-slantsixer [ Thu Dec 27, 2007 7:42 pm ]
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Quote: ... sez your engine builder

Author:	440_Magnum [ Thu Dec 27, 2007 8:10 pm ]
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Quote: Quote: Exactly- IF you take all the necessary steps and make the appropriate sacrifices. Like an efficient cam, overdrive, etc. You cannot (trust me!) just bolt a 440 Magnum in front of some tall gears with a non-lockup 727 in a 4000-lb brick and get 20 MPG. You can have a boatload of FUN, have Honda-crushing astounding reliability, and spend very little up front with no risk at all of an undriveable combination... but not while getting better than 15. How about a 69 Charger with a rebuilt 440 driving from VA to the Nats in Columbus, down the track a couple of times, back and forth to the motel and back to VA. What cam, and what were the times? I already said that I've seen similar (or better) mileage with a mild-cam New Yorker 440 in a C-body, so that's not really a surprise in a lighter and significantly slicker B-body. But since I own a bone-stock 440 Magnum in a '69 Coronet R/T (in excellent tune, BTW), I know firsthand that such mileage is impossible with the Magnum engine in a B-body. Quote: Conversely, a friend drove my 71 318 Challenger convert, no track time and 18 MPG for the trip. Both with 2.76 gears. My 318/904 Satellite used to get close to 20, and got 14 while pulling a 1200 lb trailer a few times. Some day I will resurrect that car...

Author:	440_Magnum [ Thu Dec 27, 2007 8:14 pm ]
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Quote: Last week while my Dart has been down, (getting a new aluminum manifold), I drove my 69 Chrysler 300, 375 HP 440 with 2.76 rear end back and forth to work two days for 250 miles, and it got 19.5 mpg and it is cold as heck up here and snowing! Did you check the speedometer gear? I'll bet its wrong. I'll bet a LOT that its wrong. And you'd be surprised how little the speedometer gear has to be off to give you an extra 4-5 alleged miles per gallon. Do the math... and ask me how I know the effects of a wrong speedometer calibration. Hint: mine is spot-on perfect.... NOW. Combine that with the fact you're driving like there's an egg on the accelerator pedal in the snow, and we have an eggsplanation.

Author:	440_Magnum [ Thu Dec 27, 2007 8:15 pm ]
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Quote: YAA What he said I'm SURE you'll get it perfect this time. Its not like I have any reason to doubt, is it?

Author:	runvs_826 [ Thu Dec 27, 2007 8:42 pm ]
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I had a 70 ram 250, called Blaze. It was 4 wheel drive, a 440 with a 727. Had final gears around 3.00 due to the oversized tires. I got 10 miles per the gallon. Drove it every other day for a couple months, not just to a car show (no offense) I mean actually drove it. The car's I'm sure could get 18 mpg handled correctly, with some high gears. The school's computer tech had a cutless with a 455, 2 barell, and high gears got 18ish so sure. Getting 20-22 mpg out of a big block ran at the drag strips, driven home, huh? Not calling anyone a liar, but as a mathmatician something seems not like adding up. I mean if a big block could realistically do this well, why have anything smaller, just a little lost. I'm assuming these are the exceptions not the rules? Earlier had miscommunication about junkyard engine. I comprehend know it will be a nice motor and fuel. I still know that the MDS hemi's have no performance availble (double check at thehemi.com). So yeah it's a good power-to-fuel engine. However, the charger still get's 18 with 2.8X gears and an OD. PS Yes 350 are also cheap, but I'm only $1200 bucks into my engine with 1hp-1ci. It would be close with a 350, priced one out for my dad's 49 GMC, he's going with a 292 instead.

Author:	Dart270 [ Fri Dec 28, 2007 6:43 am ]
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How about low/mid 14s and 24 MPG at 75 MPH average with a '64 Dart 225? I've been doing this for 5 years. Before the 5spd, and for 6 years before that, I got 20-22 MPG and ran the same 1/4 times. Motor cost me about $2200 carb/headers to pan when I built it (with mostly new components), and would cost something like $3000 now (also new components). I recently reringed it after 50k miles and a few thousand miles of racing. I have posted my combination(s) many times. It got 22 MPG average for the 5000 miles to CA and back last Spring and we averaged about 85 MPH. Had some solid sweeps of 100+ cruising too. A few years back I checked mileage on a trip to the Clay City Slant Race - 24 MPG including about twelve 14-sec drag passes. Best mileage has been 26-27 MPG, with 23-24 being typical. BTW, I scrupulously check my speedo/odo errors on every combo (incl different tires). On the roadcourse, it gets more like 5-6 MPG. Lou

Author:	65 dartman [ Fri Dec 28, 2007 10:07 am ]
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Quote: What cam, and what were the times? I already said that I've seen similar (or better) mileage with a mild-cam New Yorker 440 in a C-body, so that's not really a surprise in a lighter and significantly slicker B-body. But since I own a bone-stock 440 Magnum in a '69 Coronet R/T (in excellent tune, BTW), I know firsthand that such mileage is impossible with the Magnum engine in a B-body. When the motor was rebuilt, I used the MP 268/284 cam in it. Don't remember the times (this was back in 87) but do remember that it ran close to 90MPH with the 2.76s and wife as a passenger. I definitely made sure the speedo was as accurate as possible since my wife also drove the car (said it was the fastest car she ever drove!)

Author:	Aggressive Ted [ Fri Dec 28, 2007 11:26 am ]
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440 Magnum, Yes, I have a certified slip in glove box. We have a speedometer dyno out here by McChord Airforce base. They will actually dial in or rebuild speedometers. Both cars, the 74 Dart and 69 Chrysler are with in 1 mph. I have taken the 69 Chrysler 300 on many trips and got as high as 21+ mpg. In the heat of summer or dead of winter, it gets the same mileage. The stop and go is what kills it. My 69 weighs 4300 pounds.

Author:	Eric W [ Fri Dec 28, 2007 1:59 pm ]
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I agree with Ted. My old '70 Fury III (2dr hardtop) with 383 2bbl would consistantly pull down 20-22mpg on long trips (many trips between Travis AFB in CA and here). That was running 2.76's. With 3.23's it went down to around 19mpg. Not bad for a 3900+ lb car. I always liked the 2.76 gears...Punch it over 80 and the front end would still jump!

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