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Topic Review (Newest First)
11-01-2013 06:40 PM
Torque454 A new 5.0 ford coyote with a 6 speed auto gets pretty good mileage
09-28-2013 02:34 PM
Originally Posted by ogre View Post
and a low gear in the diff, as close to 3.00 as you can, or lower
Not actually, you want a gear that puts the motor in its most efficient area. "Lugging" a motor is just as bad as spinning it to high....neither will net the best mileage.
09-28-2013 11:13 AM
ogre and a low gear in the diff, as close to 3.00 as you can, or lower
09-27-2013 01:11 PM
1971BB427 If mileage is a concern then you not only want one of the modern EFI engines, but you also want a trans with overdrive. These newer engines are great, but even they wont get mileage over 25 mpg around town, or on the highway without an OD trans.
09-27-2013 11:55 AM
farna It all depends on the combination. Sounds like you have a great engine/trans/rear axle ratio combo in the 'vette -- and as you mentioned, the carb tuned right. Oh, the way you drive has a lot to do with economy too!

The main advantage to EFI is DRIVEABILITY, not fuel mileage. Theoretically a properly tuned carb engine can get as good or better mileage and power as EFI... most of the time. The main advantage of EFI is that it constantly tunes the engine to the current conditions. Carbs can only compensate so much for weather and altitude changes, and not for quality of fuel at all. So under a relatively narrow range of conditions the carb was tuned for it should do as well as EFI. Change conditions (like seasons or a few hundred feet in altitude) and the EFI engine will adjust to run better while the carb engine would have to be re-tuned to produce the same power and economy. The EFI engine should get better average economy over say a one year period without tuning, and produce better average power over the same period. If you have a fair weather carbed car that only comes out for shows or spring/summer driving you probably won't see much difference between it and a similar EFI engine, unless you're taking long trips with big altitude/weather/fuel quality differences.

Sometimes a bigger engine will get as good or better than a smaller one. Depends on how much weight it's pulling around and how the vehicle is driven. Drive a small motor hard and it will deliver poorer economy than a larger one driven the same way -- in many cases, but not all. It's all a game in getting the "right" combo for the type of driving you're doing and the vehicle you're driving.
09-27-2013 11:09 AM
Carbs get good mileage too.

Hmm, if modern EFI is so much better, than why does my '76 vette with a 350, a hot cam, sidepipes, and an intake get 22mpg while my friends Bone stock V-6 '03 mustang gets 23? I also have a Q-jet on that Vette. Carburetors can get good mileage too, you just have to know how to fiddle with them.
09-27-2013 10:51 AM
farna If you have the old 196 six then almost any newer engine will have more power and drive better. The 2V version of the 196 was rated 135 hp -- gross! That would be about 100-105 hp rated as modern engines are. A modern 2.5L four puts out more, but the 196 DOES have a lot of torque available right off idle -- it's a great "tractor" motor with 3.125" bore and 4.250" stroke. Doesn't rev up fast at all, but pulls right off idle. A modern EFI four with the accompanying modern trans would be a good power choice, something rated over 100 hp (you want more power... 100 hp four would be close to the same as the original engine). Since there are MANY I-4 and V-6 engines, not to mention V-8s, over 100 hp you're wide open for swaps. Remember that you will need the trans with the motor, and you might need to change the rear axle ratio to complement the engine and trans choice. Early Ranger 7.5" axles will fit, as well as 90-92 Ranger 8.8" axles (hard to find!). Later models are a bit wider and would be hard to fit in the American. The original axle is only 55" wide. The Ranger 7.5" is plenty tough for a 250-300 hp V-8 in a cruiser. If you plan on drag racing a lot you'll need the 8.8" though.

Oh well, that's enough on this old post! If you need any more opinions/advice let me know!
07-22-2013 10:01 PM
cobalt327 I'd imagine Toyota's UZ engine (4L and bigger, used in the Lexus and later in the Tundra, Sequoia and others) would make a real nice powerplant, but it's off the beaten track so to speak so you'd be in relatively uncharted territory.
07-22-2013 09:55 PM
Originally Posted by Tjkeis View Post
Is there any 8 cylinder egines that doesn't waste a lot of fuel? I have a 65 rambler 440 and want to do a egine swap.
Small displacement is the key here, as long as it has sufficient torque to move the vehicle efficiently. In other words, you don't want to have to run the engine at heavy throttle settings under normal conditions.

The 4.3L Chevy RPO L99 "Baby LT1" engine might be a decent choice if mileage was a primary concern.
07-22-2013 08:41 PM
Originally Posted by Tjkeis View Post
Is there any 8 cylinder egines that doesn't waste a lot of fuel? I have a 65 rambler 440 and want to do a egine swap.
Chevy LS engines are great, as small as 4.8 liters. Go to forum, they have a chapter on conversions, a lot of info to be found there.
And a really big aftermarket, too.
Also, for that kind of swap, you do not need the whole car, you need trans, engine, computer and harness and everything attached (maf, throttle pedal if drive-by-wire...). Then have your computer reprogramed and harness modified, all the rest can be done with what you have: stock rad, stock fuel tank with an external pump...
Do not be scared by the electronics, once your parts have been modified/reprogramed, it is really pretty much plug-and-play!
And any shop with a scanner can tune up your engine in the future!
07-19-2013 05:53 PM
iroc409 Sometimes the Flinstones are just right for an old car!

If you're looking for a gas miser and look towards modern engines, you might also look at some modern 6 cylinder engines. The modern stuff has a lot more power than the older stuff, and you might be able to save even more gas. However, there's also the point of the V8 having more power and able to run more efficiently at lower throttle (sometimes).

My uncle just bought a brand new Dodge 1500 truck (Hemi 5.7). He says it gets better mileage than his previous, a V8 Dakota--and likely a lot more horsepower.
07-19-2013 12:11 PM
Originally Posted by Tjkeis View Post
Is there any 8 cylinder egines that doesn't waste a lot of fuel? I have a 65 rambler 440 and want to do a egine swap.
If you want to eliminate fuel waste you need to go to a modern EFI engine. Mileage on these things was unheard of just a few years ago. But you must bring all the systems with them to do this which can be complcated and expensive. But modern performance in power, mileage and low emissions is nothing short of stunning. This upgrade would also need to include a matching modern transmission as the combination of lower low gears at one end and high overdrive ratio's at the other a powerful partners to these new engines.

Everybody uses this technology so pick the maker you like, go to the wrecking yeard and buy the whole vehicle to salvage everything from the gas tank to the radiator. Older Throttle Body Injection will double the mileage the same engine got with a carb example would be the Chevy 350 truck went from 9-10 miles to the gallon with a carb to 18-20 with TBI. The next generation L31 Vortec with seqential injection gets about 22-26. The new LS series engines see about 26-30 mpg with a huge power increase over anything that came before along with a major reduction in emissions without a bunch of gadgets hung on the motor. The other brands show same similar results.

Take a look at modern machines and your old Rambler will look like something from the Fred Flintstone era.

07-19-2013 06:34 AM
vinniekq2 consider the 4.8 LS engine.all engines waste fuel,,,lol.
07-19-2013 01:40 AM
JeffB Consider a 5.0 Ford with an AOD overdrive they can run 25 MPG highway in the Crown Vics which made them popular as Police cruisers,your Rambler weighs less so should be even better.Also the 5.0 Ford weighs 460 pounds compared to a SBC at 540 pounds and is about 2" narrower and the front mounted distributor will give more firewall clearance.Be sure to get the entire computer harness from the donor car as it controls the EFI and transmission on 1993 and later.
07-18-2013 11:57 PM
8 cylinder engines

Is there any 8 cylinder egines that doesn't waste a lot of fuel? I have a 65 rambler 440 and want to do a egine swap.

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