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Old 02-15-2014, 08:19 AM   #1
CPRJeeper's Avatar
Join Date: Aug 2013
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Cool I need a new engine!

Hey everyone, so on my way back home one day my engine locked up, long story short, i need a new engine. 4.0L 98 TJ. Now instead of just going back to the regular I6, i see this as a possibility to upgrade. I don't know too much about engines, but I do know a v8 conversion is out of my price range. Someone mentioned a stroker I6 is really good in the jeeps. What is a stroker exactly? same thing with long block? are there other engine types that I'm missing that owuld be good in a jeep? and why are they different from each other? also what brands should I be looking at? I kind of want to stay under $4 grand

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Old 02-15-2014, 08:44 AM   #2
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Check out ATK. They build a 4.7 liter to replace the 4.0. Also, Golen.

'03 TJ/ 4" Currie Lift/ Bilstein 5100's/ 35x12.50 BFG KM2's/ G2 Dana 44's/ 4.56 gears/ Eaton Lockers/ Anti-Rock/ CurrectLync/ MetalCloak Track Bars
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Old 02-15-2014, 10:27 AM   #3
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Most strokers sold increase the displacement with piston boring to give you more power and better throttle response, then the connecting rods are lengthened for more leverage and many internal parts are upgraded to more high performance parts for more power. I believe some use modified cams for more power as well. You are left with an engine the same size that puts out more power (270-350hp vs 200hp) yet retains about the same throttle response.
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Old 02-15-2014, 11:22 AM   #4
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Craigslist buy a rotted running one... Part out the rest..Or go big
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Old 02-15-2014, 02:23 PM   #5
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Out of curiosity could you tell us some more about how the engine just locked up. I am wondering how and why that would happen. Any warning signs or did it just for no reason you can tell seize?
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Old 02-15-2014, 02:46 PM   #6
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A stroker 4.7 is basically your 4.0 with just what the name implies, it's stroked. That means that the total distance from top to bottom of piston travel is increased. It's the difference between what builders refer to as 'square' being under square or over square. Square referring to the ratio between piston/bore diameter versus the stroke length. When a motor is stroked you often see higher torque outputs. Can't remember which is which (under/over square). And when a motor is anti stroked you see hp gains. It's like the difference between a 350 Chevy motor being stroked with a 400 crank that gives you a 383 super torquey and some what sluggish in comparison to a 400 Chevy motor with a 350 crank that anti strokes it to a 377 that has gobs of rpm and all the horsepower the 383 wants.
Jeeps never get stuck or broke. Just parked in odd places for an indeterminate length of time.
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Old 02-15-2014, 02:49 PM   #7
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And yes I believe you can find a 4.7 for around 3 grand, and if you don't want a used motor see what kind of prices you can get to have one built. If you bought a used motor for 500 bucks that still runs I can't see it costing more then 2100-2800 dollars to build in any setting here in the states.
Jeeps never get stuck or broke. Just parked in odd places for an indeterminate length of time.
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Old 02-15-2014, 05:44 PM   #8
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the engine quit because the oil pump quit and it ran without oil, without my knowledge because the oil guage wasnt working. It's in the shop and I wont get it back until friday. Theyre putting in an ATK 4.0 I6 in and needless to say i will get the oil gauge working as soon as I get it back
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Old 02-15-2014, 07:32 PM   #9
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Research, research, research. Type in stroker kit on the internet and talk to your local machine shop. It cost me about $700 for a complete rebuild kit for the block minus the crank. It cost me another 400 dollars to have the block decked, I had them install the new cam bearings , bored 30 over, milled the head, and some other head work done . It was just a standard rebuild and after I work out the bugs it runs great.

The reason I say research is because 1 these kits get very expensive and 2 because once you go 60 over and you screw that up you gotta start looking for a new block. I know you can go with one of the kits that require 40 over but what's the point. And also you need to consider once you go with a higher compression motor you can only run high octane fuel.

Don't get me wrong I'm all about the big stroker 6 with a supercharger & yeah you need to look that up too. I believe you're looking at about 400 hp when it's all said and done but you're also looking at enough money that you can drop in a v8. Your question is about the same as the stick or automatic trans. question. You need to figure that one out on your own because it's all about your preference for your situation. If its not a daily driver stroke it like you never stroked it before and save up for the supercharger. That's my two cents.

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4.0 , engine , engine swap , inline 6 , new engine

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