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Old 02-03-2012, 12:25 PM
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Engine build or swap?!?!?!

Well I got the green light to throw a decent amount of money into the performance of my SRT8 wanna-be. So here is my scenario.... I have a 2005 4.7 with 87k on the clock. I'm wondering if I should spend the money on building the engine or dropping in a gen2 4.7. So if you had it your way would you do which of the following and why?

A - pick up a CAI, ported TB, 08 manifold (or have mine ported based on flyin Ryans findings), KRC 218 cams and tune.

B - pick up a lowish mileage gen2 4.7 and drop her in?

If I end up going with option B, can I pick up an engine from any vehicle? Will my electronics need to be swapped out as well? And how hard of a swap would it be in general?
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Old 02-03-2012, 02:54 PM
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Re: Engine build or swap?!?!?!

If you build your motor it will be stronger internally and in HP. So in the long run it would be the better bet in my book. But as far as all out costs it may also be more expensive to build your motor then to just purchase a gen 2 and drop it in.

The gen 2 only came in the Trucks I believe because they were dropped off the jeep lineup before the 2nd gen rolled out. I also believe most of your electronics would remain as long as you have the NGC PCM. You may have to swap out your TB and I am not sure how they have the 2nd set of spark plugs wired up.
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Old 02-04-2012, 04:58 AM
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Re: Engine build or swap?!?!?!

i have spoke with flyin ryan at great lenght about building a 300 horse gen 1. The factory y pipe is mad restrictive have a exhaust shop fab one up then do a ported throttlebody on a gen 2 intake manifold ontop of whatever cai you have and a cat back exhaust with a tune should net you a goot amount of power the h.o cams would add even more kick to it
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Old 02-04-2012, 11:42 AM
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Re: Engine build or swap?!?!?!

I didn't know about the factory mid pipes being so restrictive. However glad to hear I have one piece of the puzzle already done. I have SRT8 mid pipes with no mufflers and SRT8 cat back with resonators only. I really like the number 300hp, but are we talking crank or wheel? My goal is to be at the 300s to the wheels if even possible without f/i.
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Old 02-05-2012, 10:06 PM
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Re: Engine build or swap?!?!?!

im just getting started with jeeps im more of a chevy guy but to be honest 300 at the crank will feel fast as it is. 300 to the wheels will be hard due to drive line lose on a 4x4 truck i think its like 30 percent if i remmember right 300 at crank is more doable from what i have reaserched and been told get in touch with flyin ryan he is amazing with jeep stuff
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Old 02-06-2012, 12:20 AM
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Re: Engine build or swap?!?!?!

I would be willing to believe that 300 to the crank would feel great it this point (all things being relative). I too am an ex chevy guy with a lot of LS engines in my recent past. I don't want to come across like I'm naive thinking I don't think what the gen 1 4.7 can offer isn't good enough, I just want realistic expectations. I want to be in somewhere in 12's in the quarter mile. That's my goal and wondering what the best/cost effective route is to getting there.
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Old 02-06-2012, 12:51 AM
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Re: Engine build or swap?!?!?!

UGHHHHH!!! JG has timed out twice on me!


Quote:
Originally Posted by JeepTing View Post
I didn't know about the factory mid pipes being so restrictive. However glad to hear I have one piece of the puzzle already done. I have SRT8 mid pipes with no mufflers and SRT8 cat back with resonators only. I really like the number 300hp, but are we talking crank or wheel? My goal is to be at the 300s to the wheels if even possible without f/i.
Not to be terse, but I dont feel like writing a book for a 3rd time. With 218s, bolt ons, manifold etc you're gonna reach approx 250-~275hp. Heads will be your bottleneck, porting will get you to where you want....

Quote:
Originally Posted by inferno red wk View Post
im just getting started with jeeps im more of a chevy guy but to be honest 300 at the crank will feel fast as it is. 300 to the wheels will be hard due to drive line lose on a 4x4 truck i think its like 30 percent if i remmember right 300 at crank is more doable from what i have reaserched and been told get in touch with flyin ryan he is amazing with jeep stuff
Thanks for the compliments
Quote:
Originally Posted by JeepTing View Post
I would be willing to believe that 300 to the crank would feel great it this point (all things being relative). I too am an ex chevy guy with a lot of LS engines in my recent past. I don't want to come across like I'm naive thinking I don't think what the gen 1 4.7 can offer isn't good enough, I just want realistic expectations. I want to be in somewhere in 12's in the quarter mile. That's my goal and wondering what the best/cost effective route is to getting there.
12s? Cost effective? Hope you like nitrous, and lots of it.

4.7 is a good platform and has lots of potential, but only after lots of money. It's too much of a turd from the factory to be a screamer N/A in a 4600 lb Jeep.

Get yourself a 5.7 or preferably a 6.1, the tuning is better, and so is the out of the box potential.
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Old 02-06-2012, 12:18 PM
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Re: Engine build or swap?!?!?!

Ryan thanks for the post, that is EXACTLY what I was looking to hear.
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Old 02-06-2012, 03:22 PM
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Re: Engine build or swap?!?!?!

Agreed, easiest and most cost effective to trade up for a Hemi. The mpg is not much different to the 4.7, and there are tons of hemi upgrades. The go fast factor is only limited by how much you want to spend.
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Old 02-06-2012, 04:55 PM
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Re: Engine build or swap?!?!?!

It definitely sounds like a waste of time and effort spending a bunch of money on parts that will make my Jeep as fast as a stock Hemi. I wish I wasn't in such a crunch for time when I bought my car so I could have done more research. That's life though, heinsight is 20/20!!
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Old 02-08-2012, 09:12 PM
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Quote:
Originally Posted by JeepTing View Post
It definitely sounds like a waste of time and effort spending a bunch of money on parts that will make my Jeep as fast as a stock Hemi. I wish I wasn't in such a crunch for time when I bought my car so I could have done more research. That's life though, heinsight is 20/20!!

I could eat a stock HEMI with my old 4.7 setup.


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Old 02-09-2012, 12:14 AM
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Re: Engine build or swap?!?!?!

Ya I change my mind like I change my underwear. Just bought a CAI and going to have Ryan port a tb for me. Going to pick up cams but want to see what work for forced induction.... 9-1 compression stock? Forged goodies sound nice....
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