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Re: Why does everyone hate the 4.7 V8? [Re: GODSCOUNTRY340] #2655607
05/15/19 07:38 AM
05/15/19 07:38 AM
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New Jersey, USA
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yella71 Offline
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I cant stand ohc v8s....that said it is what it is some good some junk just like everything thease days good luck


71 challenger convertable, 64 sport fury 383 ci with factory air 99 sebring convertable 89 CTD pup
Re: Why does everyone hate the 4.7 V8? [Re: yella71] #2655693
05/15/19 01:25 PM
05/15/19 01:25 PM
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Seattle WA
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RichV Offline
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I bought a used Dakota with 30k on it, I drove it until it had 185k. I never had a problem with the engine other than a leaking power steering sensor that contaminated the O2 sensor with power steering fluid. I used Amsoil in it for my entire ownership, so maybe this reduced the engine wear slightly.

Re: Why does everyone hate the 4.7 V8? [Re: GODSCOUNTRY340] #2655970
05/16/19 10:52 AM
05/16/19 10:52 AM
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Spring Valley ,Ca.
moparsquid Offline
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I have a 03 quad cab 4.7 with a 5 sped manual it has 135000 miles now and ive only replaced the thermostat very reliable I love it
,still has the original clutch

Re: Why does everyone hate the 4.7 V8? [Re: moparsquid] #2656346
05/17/19 05:42 PM
05/17/19 05:42 PM
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Omaha, Nebraska
Scott Carl Offline
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Just don't let them over heat. My grand daughter didn't realize that my Durango's plastic filler T had cracked. Kept driving until is "smoking" and "sounding funny". When the 4.7 gets too hot, the valve seats tend to drop releasing spring pressure holding the rockers in place. They go bouncing around under the valve cover wreaking all kinds of havoc.

20161008_174848.jpg20161008_174906.jpg
Last edited by Scott Carl; 05/17/19 05:44 PM.
Re: Why does everyone hate the 4.7 V8? [Re: Scott Carl] #2656354
05/17/19 06:07 PM
05/17/19 06:07 PM
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Omaha, Nebraska
Scott Carl Offline
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$500 for two used heads later and she ran like a top...................until my grandSon spun a bearing doing neutral drops.
Yeah I know, I know. No grief please LOL no I've learned my lesson. He's going to help me pull the engine now and put in a crank kit (at least). I'll update when we get it done. Yeah the 4.7 (and the 3.7 V6, which is very similar) has its quirks, but, as said, if well cared for, runs really nice. That being said, WIKN, I wish I'd looked for a 5.2 Durango.

Re: Why does everyone hate the 4.7 V8? [Re: Scott Carl] #2656369
05/17/19 07:18 PM
05/17/19 07:18 PM
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colorado
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savoy64 Offline
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4.6 ford fits right in and get better mpg and has more power----just funnin----most 4.7 failures are valve train issues in my book...

Re: Why does everyone hate the 4.7 V8? [Re: savoy64] #2656553
05/18/19 12:40 PM
05/18/19 12:40 PM
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Buford, GA
I_bleed_MOPAR Offline
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Originally Posted by savoy64
4.6 ford fits right in and get better mpg and has more power----just funnin----most 4.7 failures are valve train issues in my book...


Funny you should say that. I ran across an '05 1500 QC 4x4? with a 351/C6 furd in it, on FB Marketplace. shock Only thing I can figure out is he blew the Hemi (or 4.7 if it was still available in '05 rams) and had the furd sitting there.



Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: Why does everyone hate the 4.7 V8? [Re: GODSCOUNTRY340] #2657611
05/21/19 03:40 PM
05/21/19 03:40 PM
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Posts: 1,373
NW Chicago suburban area
Mopar Mitch Offline
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As long as the engine is well cared for (oil and filter changes, spark plugs as needed) it should be A-OK. BUT... let the oil changes be ignored... and the return passages gradually become clogged and restrictive... welcoming progressive oil starvation and proper flow throughout the engine. This "family" of engines shares this potential problem more-so than certain other engines.


Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
Re: Why does everyone hate the 4.7 V8? [Re: Mopar Mitch] #2657749
05/21/19 08:43 PM
05/21/19 08:43 PM
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Freeport IL USA
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Originally Posted by Mopar Mitch
As long as the engine is well cared for (oil and filter changes, spark plugs as needed) it should be A-OK. BUT... let the oil changes be ignored... and the return passages gradually become clogged and restrictive... welcoming progressive oil starvation and proper flow throughout the engine. This "family" of engines shares this potential problem more-so than certain other engines.


That almost sounds like the Mopar tag line.
The reality is these motors are designed for a 150K life span, some don't make it that far, others go farther. How it was taken care of has some effect, but that doesn't change the fact the motor was designed to die at 150K. Back in the old days, that 150K was probably acceptable because most vehicles didn't make it that far, but by today's standards, 150K should be "just broken in" not "just about broke."

I buy used vehicles, several of the modern Mopar motors leave a lot to be desired, this is not the "old Chrysler" for sure. I won't buy anything with the old 2.7, or anything with the 4.7 because most are on their death bed by the time they come into my price range. I really don't foresee a modern car in my future, I'll rebuild the old stuff. Gene

Re: Why does everyone hate the 4.7 V8? [Re: poorboy] #2657792
05/21/19 10:44 PM
05/21/19 10:44 PM
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Really back in the day, a vehicle with more than 80,000 miles on it was acknowledged to be worn out. And my favorite long term mechanic told me that Ford flathead 4s and V8s could stand new rings and bearings every 40K miles. He counted on them to make his living.

When my wife and I went out to buy a "new" truck we ended up with an '07 F150 with the two valve 4.6. You really have to twist it tight to get it to move out. So it's got overdrive and a small modern V8 and the first 600 miles it averaged 14.7 mpg. The second trip averaged 14.74mpg. I never get 15mpg either in town or on the freeway. Thirsty.

I was really disappointed to find out I didn't get a higher power 3 valve engine. But then i started reading Ford truck Enthusiasts online and see that while the 3 valve 5.4 has a lot more power, at around 125K miles it needs basically all the valvegear and timing equipment replaced and the only quality parts are FoMoCo and will set you back about $1500 for the parts. Plus they have real spark plug problems you may have heard about.
The message is don't feel so all alone.The modern small V8s eat gas and money. The GM LS engines don't have the valvegear problems but once again the 4.8 has to be revved to the moon to put out any power. The larger engines don't seem to have those problems.
For my 4.6 the key seems to be use only factory parts, and keep the oil fresh and clean.
R.

Re: Why does everyone hate the 4.7 V8? [Re: poorboy] #2657798
05/21/19 10:52 PM
05/21/19 10:52 PM
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Posts: 18,124
Granite Bay CA
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Granite Bay CA
Originally Posted by poorboy
.
The reality is these motors are designed for a 150K life span, some don't make it that far, others go farther. How it was taken care of has some effect, but that doesn't change the fact the motor was designed to die at 150K. Back in the old days, that 150K was probably acceptable because most vehicles didn't make it that far, but by today's standards, 150K should be "just broken in" not "just about broke."

I had a 2002 Ram 1500 with this engine. It ran fine but was a slug. Gutless. The mileage was not great, maybe 17 freeway on flat ground. I ran it up to 163,000 miles and sold it when I bought a 2006 Ram 1500 4wd 5.7. The 2006 got better mileage and made more power!
The 2002 though...Spark plug changes were easy...Straight down through the intake! They had an interesting oil filter drainage trough too....I wish the 383-440 engines had something similar!

Re: Why does everyone hate the 4.7 V8? [Re: poorboy] #2657981
05/22/19 12:11 PM
05/22/19 12:11 PM
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Holland MI Ottawa
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2boltmain Offline
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Originally Posted by poorboy
Originally Posted by Mopar Mitch
As long as the engine is well cared for (oil and filter changes, spark plugs as needed) it should be A-OK. BUT... let the oil changes be ignored... and the return passages gradually become clogged and restrictive... welcoming progressive oil starvation and proper flow throughout the engine. This "family" of engines shares this potential problem more-so than certain other engines.


That almost sounds like the Mopar tag line.
The reality is these motors are designed for a 150K life span, some don't make it that far, others go farther. How it was taken care of has some effect, but that doesn't change the fact the motor was designed to die at 150K. Back in the old days, that 150K was probably acceptable because most vehicles didn't make it that far, but by today's standards, 150K should be "just broken in" not "just about broke."

I buy used vehicles, several of the modern Mopar motors leave a lot to be desired, this is not the "old Chrysler" for sure. I won't buy anything with the old 2.7, or anything with the 4.7 because most are on their death bed by the time they come into my price range. I really don't foresee a modern car in my future, I'll rebuild the old stuff. Gene


I remember reading on the hemi when it came out in the early 2000s. I learned the term "Specific Engineering." Built to last to a certain mileage and sometimes not made to be rebuilt as in not enough meat for an overbore..


Keep old mopars alive.
Re: Why does everyone hate the 4.7 V8? [Re: GODSCOUNTRY340] #2657985
05/22/19 12:31 PM
05/22/19 12:31 PM
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USA
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360view Offline
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It has been a little while but I seem to remember that the 5.7 got attention for how low its cost to build was with “modular” assemblies coming from non-UAW plants and final assembly in the Mexico factory. Ex-GM manufacturing guru Tom LaSorda was given the 5.7 build assignment by Bob Lutz and he got praise for how it turned out, despite the camshaft bearing fiasco.

I think I remember that the 4.7 V8 costs considerably more.

I would like to look at the BSFC maps of the 4.7 and 5.7.
Since larger bores have an efficiency advantage my guess would be that the best efficiency “island” of the 5.7 has a lower number than the best spot on the 4.7 V8 map.

Re: Why does everyone hate the 4.7 V8? [Re: Mopar Mitch] #2658000
05/22/19 01:15 PM
05/22/19 01:15 PM
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Kalispell Mt.
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HotRodDave Offline
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Originally Posted by Mopar Mitch
As long as the engine is well cared for (oil and filter changes, spark plugs as needed) it should be A-OK. BUT... let the oil changes be ignored... and the return passages gradually become clogged and restrictive... welcoming progressive oil starvation and proper flow throughout the engine. This "family" of engines shares this potential problem more-so than certain other engines.


This is the 2.7 you are thinking of, they get water in the oil that makes massive amounts of sludge that plug the return passages, I have torn apart tons of 4.7s and the worst sluged ones did not have enough to plug an oil return passage.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Why does everyone hate the 4.7 V8? [Re: HotRodDave] #2658097
05/22/19 05:25 PM
05/22/19 05:25 PM
Joined: Aug 2006
Posts: 2,362
God's Country Maryland
GODSCOUNTRY340 Offline OP
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God's Country Maryland
I was asking because my son was looking at a 2002 Dakota with a 4.7 with 160,000 miles. I suggested he look for something with a 5.2 or 5.9, he wanted a gas engine. He ended up buying this, it's an '01 2500 with a 5.9 magnum, 6 speed manual with 180,000. He needs it as a shop truck so the flatbed will work out great.

106_4119.JPG106_4118.JPG

I love the smell of Deer guts in the morning, it smells like... VICTORY!
Re: Why does everyone hate the 4.7 V8? [Re: GODSCOUNTRY340] #2658104
05/22/19 05:41 PM
05/22/19 05:41 PM
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Posts: 26,307
Florida STAYcation
dOc - 3.0 ! Offline
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Florida STAYcation
I had two jobs done by a shop locally who said STAY AWAY from any Mopar motor with a .7 in it except the 5.7 !

Re: Why does everyone hate the 4.7 V8? [Re: dOc - 3.0 !] #2658289
05/23/19 07:38 AM
05/23/19 07:38 AM
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Posts: 782
Plymouth, MI
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HotRod20 Offline
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Plymouth, MI
Had a Chrysler exec demo Ram 1500 with the 4.7 got rid of it at 90K miles when the lifters starting rattling at every stop light.After much research from mechanics at Dodge dealerships, I was told the oil passages and internal design of this engine was flawed from day one, but Auburn Hills decided not to drop production but let it fly. Kind of like built in failure engineering. Sell the vehicles, repair em' later...

HotRod20

Last edited by HotRod20; 05/23/19 07:38 AM.
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