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andrew
Dodge Dakota
5/26/2001
17:46:51
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 Subject: Interested in the 4.7
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Message:
I was wondering what the major differences are between the 4.7 V8 and the 5.2 V8? I mean, is there any major differences like in the ignition, fuel pump, water pump, Tb, etc.? Also, whats the major difference in performance between the two and what does the 4.7 redline at? Are the HP/Torque figures all that different?
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jeffster
Dodge Dakota
5/26/2001
18:16:20
| RE: Interested in the 4.7
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Message:
Major differences?? Oh ya like over head cam aluiminum heads composite intake manifold along with distributerless ignition. Runs way cooler produces a little more HP and is way more economical on gas.
Red line I don't know but run it to over 5K with no problems. The 5.2 would loose power almost instantley when it passed it's red line of 4,600 RPM's
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Patrick ODay
Gen III
5/26/2001
23:38:04
| RE: Interested in the 4.7
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Message:
The 5.2 is an older proven technology. The 4.7 is completely different. I can email you a run down on the differences if you would like.
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andrew
Dodge Dakota
5/26/2001
23:56:23
| RE: Interested in the 4.7
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Message:
Please Patrick, I am very interested.
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BB2
Dodge Dakota
5/28/2001
09:57:40
| RE: Interested in the 4.7
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Message:
Check here for some specs on the 4.7l Engine
http://www.allpar.com/mopar/47.html
http://dodgeram.org/tech/gas/Cammer/4_7_v8.html
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sandman
Dodge Dakota
5/28/2001
11:35:28
| RE: Interested in the 4.7
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Message:
The 4.7 is an overhead cam design. It does not have push rods or hydralic lifter like the 5.2.The heads are very similar to a hemi head and are made out of aluminum and the valve cover is made out of magnesium. The 4.7 has distribtorless ignition. The 4.7 has a deep skirt design and most of the oil pan is made out of cast iron to stiffen the lower end of the engine. The 4.7 was designed to be a truck motor so they made the crank jornals larger then you would for a passanger car to stand up to high load high torque low rpm use. The oiling system is two concentric gears that rid in the timing cover like the Japs have used forever and it is also the designe that GM uses on their 3.8 V6. These are just the obvious difference there are alot more subtle designs enhacements. While it's durability has not yet been proven it has been meet with nothing but praise from most of the people on this board.
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Joe GS
Dodge Dakota
5/28/2001
18:34:54
| RE: Interested in the 4.7
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Message:
Putting on my flame proof shorts-
I have 9k miles on a 4.7 in a QC auto trans. The motor is acceptable but not exceptional due to an annoying power curve flat spot between 2-3k RPM (it shows up clearly on the Chrysler brochure dyno graph). This is right where the engine spins during freeway cruising, so if the road rises or you want to pass the trans has to downshift. It would be irritating if you towed a lot because that V8 acts more like a whiny little 4 banger that needs to spin up to get moving.
This is caused by one of three things, in order of increasing probability:
- something is fundamentally wrong with the motor design (not likely)
- the fuel injection and/or timing are compromised to achieve emissions or fuel consumption over performance for some government standard (easily fixable by computer reprogramming)
- the cam timing is tuned to get the highest peak HP number for advertising purposes. This would be easy to fix by degreeing the cams in a DOHC motor, but not easy to tune out of the SOHC 4.7 litre.
Every time I drive my Dakota I think how much fun that engine would be in the RWD 5 speed manual Charger Chrysler was showing a few years ago, but it's not much of a truck powerplant.
If you use the truck lightly loaded it is fine. If you want to tow a trailer or haul loads get the bigger motor or at least the lower ratio axle(s).
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Joe GS
Dodge Dakota
5/28/2001
18:35:53
| RE: Interested in the 4.7
IP: Logged
Message:
Putting on my flame proof shorts-
I have 9k miles on a 4.7 in a QC auto trans. The motor is acceptable but not exceptional due to an annoying power curve flat spot between 2-3k RPM (it shows up clearly on the Chrysler brochure dyno graph). This is right where the engine spins during freeway cruising, so if the road rises or you want to pass the trans has to downshift. It would be irritating if you towed a lot because that V8 acts more like a whiny little 4 banger that needs to spin up to get moving.
This is caused by one of three things, in order of increasing probability:
- something is fundamentally wrong with the motor design (not likely)
- the fuel injection and/or timing are compromised to achieve emissions or fuel consumption over performance for some government standard (easily fixable by computer reprogramming)
- the cam timing is tuned to get the highest peak HP number for advertising purposes. This would be easy to fix by degreeing the cams in a DOHC motor, but not easy to tune out of the SOHC 4.7 litre.
Every time I drive my Dakota I think how much fun that engine would be in the RWD 5 speed manual Charger Chrysler was showing a few years ago, but it's not much of a truck powerplant.
If you use the truck lightly loaded it is fine. If you want to tow a trailer or haul loads get the bigger motor or at least the lower ratio axle(s).
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jeffster
Dodge Dakota
5/28/2001
20:00:44
| RE: Interested in the 4.7
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Message:
I beleive what you are saying about that engine as a heavy duty work truck. 5.9 is better if you can handle the gas payments. Like you said with a 5 speed manual in a small car or in my case a small truck this power plant is awsesome.
Wheeeeeeeeeeeeeeeeeeeeeeeeee!!
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JMII
Dodge Dakota
5/29/2001
12:49:21
|  RE: Interested in the 4.7
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Message:
Anyone have the HP and Torque curve chart handy? I looking into one for towing a
boat/trailer combo that weight in a under 2,000 lbs
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