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orjohn
Dodge Dakota
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12/20/2004
16:30:48
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 Subject: 4.7,5.2,5.9
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i have a 93` 3.9 dakota.And from the looks of it, it takes way to much money to make the 3.9`s horsepower up to par with the v8`s. So my question is which v8? Im going to the salvage yard soon to look around. 4.7? 5.2? or5.9? how many horses do each put out? and what all do I need to make that fit in my 3.9 dak? I know moutning brackets, new computer,but what else?
thanks for any help John
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Kowalski
GenIII
12/20/2004
17:03:41
| RE: 4.7,5.2,5.9
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As much as I like the 4.7, integrating a PCM to run it in your '93 could be a nightmare. So it really boils down to how much power you want or what you have available to decide between 5.2/5.9
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stantheman04
Dodge Dakota
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12/21/2004
01:14:19
| RE: 4.7,5.2,5.9
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you ate probably looking at around about 250-260 hp for the 5.2 and for the 5.9 you are probably looking at around 300-310 hp. if some one know the exact number correct me cause i am just guessing.
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EBL
Dodge Dakota
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12/22/2004
18:00:40
| RE: 4.7,5.2,5.9
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Well, do you want horsepower or torque?
My 5.2 (92) came with 220hp and around 300 ft lbs of torque from the factory. I don't know what the 5.9s came with.
If you are going to make the change, it will cost the same to go with a 5.2 or a 5.9, so you may as well do the 5.9. I would look for the internals out of a 93-95 Ram as they came with the 5.9 from the factory. Your Gen II Dakota did not. If you found a V8 Dakota, you would have the 5.2, still a good engine, but it would not have the torque of the 5.9.
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orjohn
Dodge Dakota
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12/22/2004
19:16:58
| RE: 4.7,5.2,5.9
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thanks! i want to get the truck somewhere into the low 15`s,high 14`s. Its a 2x4 dak. standard cab. long bed. it weighs in at only like 3300. would a 5.9 or even a 5.2 get me there stock?
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sudden sam
Dodge Dakota
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12/23/2004
17:24:10
|  RE: 4.7,5.2,5.9
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sam,
If your talking light mods and stock motors.
YOU'RE DREAMING!!! WHERE DID YOU GET YOUR #'S?
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hey sammy
Dodge Dakota
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12/23/2004
19:18:04
| RE: 4.7,5.2,5.9
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try 225 for the 5.2 and 245 for the 5.9 stock, dork
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stantheman04
Dodge Dakota
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12/24/2004
00:23:26
| RE: 4.7,5.2,5.9
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did i say i was right. Notice i said if anyone knows the exact numbers correct me. who da dork now.
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stantheman04
Dodge Dakota
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12/24/2004
00:25:58
| RE: 4.7,5.2,5.9
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well if the 5.2 has 225 stock and a 4.7 has 230 stock how is that possible cause the way i always thought it was is the bigger engines have more horse power and if anyone knows the correct anwser post it
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MetalJim
Dodge Dakota
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12/24/2004
05:06:49
| RE: 4.7,5.2,5.9
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Because the 4.7 is an overhead cam engine and the 5.2 is an oldschool pushrod motor.
Horespower is a measurement of torque. HowStuffWorks.com has a good explanation of how horsepower is measured.
http://auto.howstuffworks.com/horsepower.htm
The equation is HP = Torque * RPM/5,252. Torque will always equal horsepower at 5252RPM. Look at any dyno sheet and you'll se that plain as day. The reason the 4.7 has comparable HP to the 5.2 is because it revs higher than the 5.2.
Generally speaking, bigger motors generate more torqe than smaller motors - thats not the same thing as power. Horsepower is more a measure of how the motor takes advantage of the torque that it generates. I have a 190HP naturally aspirated 2.0L engine. Thats less than half the size of either of those V-8s, but it can take advantage of the torque it generates over a broader RPM range than either of them. So my 2.0L generates more than 100 ft-lbs of torque LESS than the 4.7, yet the 4.7 makes just 40HP more than the 2.0L.
Here's another link that may help you understand why car people talk about HP and not torque.
http://www.geocities.com/MotorCity/7177/torquehp.html
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Kowalski
GenIII
12/24/2004
07:59:09
| RE: 4.7,5.2,5.9
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MetalJim - some good info there, and some that's a little misleading. It is because of the design of the motor; but many seem to get confused about the part the overhead cam plays so I'd like to clarify that. There is nothing about the location of the cam in the motor that determines power. More important is the cam profile and overall design of how effectively and efficiently the power is made - that's where the 4.7 shines. Higher reving motors can more power on top. Smaller, high reving motors like your 4 cylinder example that make good PEAK hp typically are giving up torque (and hp) in the low end to do it. That's why its important to look at power "under the curve" (in the rpm/power graphs) rather than focusing on peak power #s. Your example will not make as close to the power of the larger motors at lower rpm.
Lead, follow, or get out of the way
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orjohn
Dodge Dakota
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12/24/2004
08:56:57
| RE: 4.7,5.2,5.9
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ok... well since i just found out it is illegal to swap in a bigger motor, im thinking of buying a used r/t. Any one no any good sites tolook at them at?
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N56629
Dodge Dakota
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12/24/2004
09:00:51
| RE: 4.7,5.2,5.9
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Well, Kowalski, that's a bit misleading too since the 5.9 diesel generates a whopping 610 pounds-feet of torque at 1,600 RPM. Obviously, size is not the sole determining factor when it comes to producing torque.
MetalJim didn't try to make a comparison at low rpm, but a comparison over a "broader rpm range." Nothing misleading about that.
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turbostang
Dodge Dakota
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12/24/2004
22:02:59
| RE: 4.7,5.2,5.9
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The 5.9 diesel generates all that torque because it's turbocharged..Forced induction make that 5.9 liter motor think it's a 10 litre..
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jasonsdakota
Dodge Dakota
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12/24/2004
22:13:21
| RE: 4.7,5.2,5.9
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don't forget a diesel hovers somewhere around 18.0 to 1 through 25.0 to 1 compression. no wonder it's twice the torque, then add that all of them these days are turbocharged doesn't hurt those numbers. ever try running gasoline at 20 to 1. your diesel will idle at 2500 rpm.
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N56629
Dodge Dakota
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12/25/2004
09:05:24
| RE: 4.7,5.2,5.9
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"The 5.9 diesel generates all that torque because it's turbocharged.."
Turbocharged or not, it would still make more torque and at lower rpm.
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turbostang
Dodge Dakota
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12/25/2004
19:48:56
| RE: 4.7,5.2,5.9
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I may be wrong, but I don't really think so.. Diesel just doesn't have the energy of gasoline.. Also I remember reading where some naturally asperated passenger car diesels.. Have their throttles setup so that they reach full fuel dump (no throttle blades on a diesel), with their gas pedal only half way to the floor.. That was to give the "illusion" that they have snappy throttle response, with only minimal throttle input..
If you want to know the primary reason Fords new 6.0 liter Powerstroke out powers the older 7.3 liter Powerstroke.. Just look at the size of the turbo's they put on each of them..
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Kowalski
GenIII
12/26/2004
19:47:54
|  RE: 4.7,5.2,5.9
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N56639 - Diesel is a whole 'nother ballgame, no one was comparing anything to diesel. Diesel's torque and fuel economy advantage has much to do with the difference in compression ratios. You seem confused - really nothing at all misleading about what I posted; additionally you seem to be trying to mis-quote jasonsdakota. Rather silly to debate someone if you have to keep twisting things.
Lead, follow, or get out of the way
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