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Iam That Iam
Dodge Dakota
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1/30/2004
15:03:38
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 Subject: RE: 4.7 vs 5.9
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I would first like to educate you all on the law of physics.
1. Displacement equals horse power and Torque.
(This is a simple law of physics that can never be changed.)
2. Air flow, fuel atomization, combustion, compression, and exhaust extraction will increse horse power and torque.
(This is a complex law of physics that can never be changed.)
3. There is no substitute for either of these laws.
(Nitrous, cams, exhaust, injectors, throttle bodies, boring, stroking, super charging, etc. only support these laws.)
The 4.7 litre by its very displacement could never produce as much horse power or create as much torque as a 5.9 could. All things being equal on both engines.
The 4.7 litre will get better mileage than 5.9 all things being equal because of its displacement. This can not be changed.
The problem comes in where all things are not equal. 5.9 has more mods its been around for ever. There will never be more mods available for the 4.7 until the 5.9 stops production. It is a standard race engine for many people including myself. It has been proven for many years to be an excellent engine.
The 4.7 is an economy engine indicated by its use in non high performance vehicles (this is not to say that it's bad in any way). The 5.9 has always been meant for higher stress applications. The 5.9 has its share of flaws fuel economy for one.
I own a quad cab Ram 1500 with a 5.9 I got it because it is proven. It has bigger main journals more parts available(except cold air intakes for my truck specifically). This makes it a better towing engine (not that a 4.7 can't tow).
Is the 4.7 a bad engine? no. Is it comparable to a 5.9? no. Will it ever be? no. That is why Dodge still uses the 5.9 in heavy and high performance applications. Will it replace the 5.9. No the 5.7 will first.
Although personally I prefer the 440 and wish they would bring it back. 318/360/440 I have made them all over 1000 ponies with out NOS or super charge.
By the way The hemi is also available in 5.9 I looked at it when I got my truck last week. They had over 12 on the lot. Suddenly 5.9 got efficient and displacement.
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Brians_DAK
Dodge Dakota
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2/01/2004
04:45:20
|  RE: 4.7 vs 5.9
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Tell those who race formula 1 your first law of HP. Its not about cubic inches really anymore, its about cubic dollars... As for the 4.7 being a race application making bookoo power, its all in how much money your willing to throw at it.
~Brian
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islander
Dodge Dakota
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2/01/2004
10:38:39
| RE: 4.7 vs 5.9
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so which race car uses the 4.7??
(criket chirp)
I would like to know how to get 1000 hp
out of a normally aspirated 5.9.
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TECH
Dodge Dakota
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2/01/2004
11:55:35
| RE: 4.7 vs 5.9
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Quote: I would like to know how to get 1000 hp
out of a normally aspirated 5.9.
Nitro.....hehe
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JC
Dodge Dakota
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2/01/2004
14:22:24
| RE: 4.7 vs 5.9
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The original question asks why owners of the 5.9 choose it over the 4.7. To me, the answer is simple: I will never ever again buy an engine with OHC's. My experiences with them have been poor and repairs are not cheap.
Having driven both the 4.7 and 5.9, the tide for me turns in favor of the 5.9. Personally, I feel it has tremendous grunt and contrary to what some have to say, it pulls and keeps pulling. The way some people talk, you'd expect the 5.9 to literally stop once it gets past 60mph. This engine is alot for a truck of this size. It motivates it very well and so well that it can scare you sometimes.
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Brians_DAK
Dodge Dakota
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2/01/2004
15:08:01
| RE: 4.7 vs 5.9
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Opninions are like buttholes, eveyone has one and no one cares right? Point being, anyone with enough cash flow can make anything fast. If not then how are supras pushin almost 1200 hp outta their v-6's.? Forced induction right? RIGHT! Its still a whimpy little v6 but on some serious steroids. Speed costs money, how fast you ready to go?
~Brian
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jroger68
Dodge Dakota
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2/03/2004
12:50:24
|  RE: 4.7 vs 5.9
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Funny, I always thought displacement=bore x stroke...
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jroger68
Dodge Dakota
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2/03/2004
12:52:13
| RE: 4.7 vs 5.9
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and don't the new 4.7s have the same HP (230) out of the box as the 5.9?
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jroger68
Dodge Dakota
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2/03/2004
12:56:22
| RE: 4.7 vs 5.9
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so, for a guy who is trying to compare an out of the box new 4.7 to a, say two year old 5.9, and all he looks at is horsepower, isn't it a wash?
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midnightmagic
GenIII
2/03/2004
13:20:25
| RE: 4.7 vs 5.9
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will it ever end......prolly not, i'd take either motor!
You gotta ask yourself one question...That Thing Got A HEMI???
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kowalski
Dodge Dakota
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2/03/2004
16:34:30
| RE: 4.7 vs 5.9
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jroger68 - hp is not the same - 4.7 is 10 horse less, and 40 lb/ft of torque less. That said, I'm still happy with the lighter, more efficient 4.7. Don't understand why Iam That Iam thinks its not comparable - With a couple easy mods (HO cam & PCM flash) I'm making comparable power and will never have to deal with a leaky belly pan gasket or a bent pushrod. The 5.9 has a great following but there's no need for people to keep bashing the newer technology. Its enough to make me wonder how some 5.9 fans ever came to accept new things like radial tires or disk brakes !
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VITO
Dodge Dakota
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2/03/2004
17:39:08
| RE: 4.7 vs 5.9
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And R/T=Road Turd
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R/TBlues
Dodge Dakota
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2/03/2004
20:05:04
| RE: 4.7 vs 5.9
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I have 8 years of experience with overhead cam engines. I had a 1993 Taurus SHO. It had a 3.0L DOHC engine. I sent the heads off to rebuild and they wouldn't rebuild them because the cam journals were too worn.
I haven't had the heads off the 4.7L to look at them. I hope they are nothing like Fords OHC engines. Ford has no cam bearings in it's 3.0DOHC SHO engine. The bore for the cam journals are bored to match the cam and the aluminum in the head is the bearing material. It cost major bucks to have them welded up and rebored. I couldn't find anyone that would do it for under $1000.00. I hope Dodge put bearings in their OHC heads for the camshaft. If they don't, in about 6 years or 120,000 miles you will be replacing the heads like I did on my OHC Ford.
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jroger68
Dodge Dakota
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2/04/2004
09:42:46
| RE: 4.7 vs 5.9
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maybe closed minds will open with the '05 HO 4.7 which claims 250+ HP....
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R/TBlues
Dodge Dakota
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2/04/2004
13:29:36
| RE: 4.7 vs 5.9
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The genIV will have to have 250hp to make up the difference in weigh. It looks to be more of a porker than the genIII's.
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Joe
Dodge Dakota
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2/04/2004
13:42:39
| RE: 4.7 vs 5.9
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Hey, whoever said that the 360 has always been meant for high stress applications should think back to when they were first introduced. The 340 was handicapped by emissions requirements, so Mopar had to compensate somehow.
Also, the 5.9 in the Dakota R/T was swapped in because it was available and profitable, not becasue they wanted to create a high-performance truck.
I've never viewed the 360 as a high performance motor. That's best left to the 340, 413, 426, 440, etc. In my opinion, the 4.7 is a fitting replacement for the 360.
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