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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #21  
Old 12-20-2011, 10:34 PM
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snrusnak snrusnak is offline
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Congrats on a job well done! Try a can of seafoam in the gas tank too, maybe that'll help.
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  #22  
Old 12-20-2011, 10:55 PM
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I plan to dump some form of carb/injector cleaner in for sure but I will do it just before I do an extended drive of 50 miles or more. I have heard that this will reduce the risk of plugging up the injector screens. I am hoping that some good fuel in the meantime will clean things out.

I am going to put 700 or so miles on this motor and then change the oil. I will do one more change and then switch it over to full synthetic.
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  #23  
Old 12-21-2011, 02:16 PM
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Swapped out the injectors today with no improvement. I swapped them back and did a compression test while I was at it.
i knew one exhaust valve was caked with carbon so i started there and the best i could get was 125 psi. I only checked a couple others. Specs say 140-180 is normal.

cyl#6 = 125psi
cyl#4 = 150psi
cyl#2 = 165psi

I have contacted the guy whom I purchased the engine from and am awaiting his response.

In the meantime I am pondering yanking the engine out and pulling the heads. It is either going to need a new head gasket, head, piston or worst case scenario, all of the above. I really wanted to do all this before I installed it but decided it was best to not disturb the factory installed heads and open that can of worms unless absolutely necessary. Turns out it would have been a good idea. Gotta love hindsight.

Last edited by IN2H2O; 12-21-2011 at 02:24 PM.
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  #24  
Old 12-21-2011, 03:12 PM
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dang, either way you'll be able to knock it out no problem! P&P heads while your at it!
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  #25  
Old 12-21-2011, 03:31 PM
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Could always buy a set of heads from airram, they're about as free flowing as you can get for the 4.7L
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  #26  
Old 12-21-2011, 06:24 PM
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Quote:
Originally Posted by snrusnak View Post
Could always buy a set of heads from airram, they're about as free flowing as you can get for the 4.7L
I will look it up. If they are available quicker I may go that route just to speed things up. Local shop wants $550-$600 to rebuild both my heads, ($80 more for new exhaust valve guides), but can't get to them until the new year.

I spoke to the guy who supplied the engine. He thinks it's a stuck ring from the engine sitting and reccomends to run the truck for a week or so to see if it loosens up. Unfortunately I am off work all week and have nowhere long distance to go. I have made a couple trips around town and it's been running decent enough so I am going to run it until it shows a bigger problem. I usually drive 750 miles a week so it shouldn't take long.

backup plan: I pulled my old engine down to make sure the head is rebuildable and thankfully it is. The bottom end has been freshened up on the newer engine so my plan is to rebuild my old heads and swap them onto the newer bottom end if necessary. I am going to drop all the old engine parts off at the machine shop tommorrow just to get it out of my garage so it works out well. This way if i need to move on it, all I have to do is place a call and they can get to work on it.

So in the meantime, I'm going to keep my fingers crossed and bag the carbon out of it.

Last edited by IN2H2O; 12-21-2011 at 06:33 PM.
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  #27  
Old 12-21-2011, 06:32 PM
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Quote:
Originally Posted by snrusnak View Post
Could always buy a set of heads from airram, they're about as free flowing as you can get for the 4.7L
Holy crap that's a dangerous site, lol.

Thankfully I have no urge for more power in my daily driver. I have owned many hot motors over the years and I am thankfully over that phase of my life. All I have ever gotten for hot rodding is a bad rep, dirty looks and alot of speeding tickets. I satisfy my power needs with my toys and leave my daily driver bone stock.
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  #28  
Old 12-21-2011, 07:41 PM
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Quote:
Quote:
Originally Posted by snrusnak
Could always buy a set of heads from airram, they're about as free flowing as you can get for the 4.7L
Holy crap that's a dangerous site, lol.

Thankfully I have no urge for more power in my daily driver. I have owned many hot motors over the years and I am thankfully over that phase of my life. All I have ever gotten for hot rodding is a bad rep, dirty looks and alot of speeding tickets. I satisfy my power needs with my toys and leave my daily driver bone stock.
LOL yeah that guy on there got his truck to run 14's in the 1/4 mile (quad cab). While that may not seem overly impressive, keep in mind the truck started out with 235 hp, and I think the stock 1st gen 4.7L's ran like a 18 second 1/4 mile. So a huge improvement. I think those heads are a little over $1,000, but if you have to buy new ones anyway I personally would upgrade, even if you don't "need" the performance, you'll get better fuel economy and you'll like the fact that it has some more pep.

cylinder heads are the biggest factor in a engine's performance, so I'd spend the $500 extra to upgrade there, if nowhere else.
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  #29  
Old 12-21-2011, 10:01 PM
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Because of the current and future mileage on this truck, I actually consider it disposable so no big upgrades are in the future unless they net huge mileage gains. I figure I need to get 120K more miles out of it so I am picking my parts accordingly so it will all come to a head a little over 400k miles and coincide with my next big move for work. My vehicle needs will likely change so it works out that I wait and see what suits the situation.
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  #30  
Old 12-22-2011, 04:34 PM
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Replaced O2 sensors, cam position sensor and Throttle position Sensor today with no change. I have 45 miles on the engine and it's runnig decent enough otherwise so here's hoping its just carbon buildup. I am doing a 300 mile roadtrip tomorrow to really put it to the test.
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