Good engine swap for jeep yj? - JeepForum.com
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post #1 of 17 Old 05-20-2014, 10:08 PM Thread Starter
Ctjeep200
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Good engine swap for jeep yj?

I have a 1991 jeep yj and I was thinking about putting a different motor in it once the 4.0 goes out. What would be a good motor to put in it that has decent power and reliable? I have seen several with a chevy 350 in it. Is that a good motor? Or should I go with some thing different? And what motor will fit in my jeep? Or would it be best to stay with the 4.0?

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post #2 of 17 Old 05-20-2014, 10:11 PM
BCrawford64
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rebuild the 4.0, decent power and reliable.
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post #3 of 17 Old 05-20-2014, 10:15 PM
Chrisnvegas
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Originally Posted by BCrawford64 View Post
rebuild the 4.0, decent power and reliable.
Way too easy...

Read this, then make up your mind.

Jeeps Kick *** Engine - The History Of The 4.0L

http://www.fourwheeler.com/how-to/en...story-4-liter/

"Alferd Packer: “Stand up, you voracious, man-eating son of a *****, stand up! There was seven democrats in Hinsdale County and you up and ate five of them."
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post #4 of 17 Old 05-20-2014, 10:39 PM
Sparrows
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A Vortec...

Cheers


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June '13 YJOTM
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post #5 of 17 Old 05-20-2014, 10:49 PM
ki4cye
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I love my tbi 350 but if i had it to do again i might go with an injected 5.3 chevy
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post #6 of 17 Old 05-20-2014, 11:25 PM Thread Starter
Ctjeep200
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Quote:
Originally Posted by Chrisnvegas View Post
Way too easy...

Read this, then make up your mind.

Jeeps Kick *** Engine - The History Of The 4.0L

http://www.fourwheeler.com/how-to/en...story-4-liter/
The link doesn't work.
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post #7 of 17 Old 05-21-2014, 04:50 AM
superj
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302 is a solid choice too

I don't feel like working on anything at this time so i sold my yj.
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post #8 of 17 Old 05-21-2014, 07:18 AM
StanF
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Quote:
Originally Posted by Ctjeep200 View Post
I have a 1991 jeep yj and I was thinking about putting a different motor in it once the 4.0 goes out. What would be a good motor to put in it that has decent power and reliable? I have seen several with a chevy 350 in it. Is that a good motor? Or should I go with some thing different? And what motor will fit in my jeep? Or would it be best to stay with the 4.0?
First, some questions:

What do you want to do with your Jeep?
Why do you need the extra power?
What axles do you have?
What transmission do you have now and want in the future?
What's your budget for the swap?


Going to V8 power has many costs in other areas (axles, transmissions, wiring, adapters, etc).

Dropping in a refreshed 4.0L is the most cost-effective path (hence the budget question). Or possibly a stroker 4.7L, if that would make sense for you.


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post #9 of 17 Old 05-21-2014, 08:46 AM
Randonexplosion
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Quote:
Originally Posted by Sparrows View Post
A Vortec...

Cheers



You need to do a lot of research. Find some build threads that include the motors that you are considering and give them a read. Then you will see how much is actually involved.

This is a good read too http://www.novak-adapt.com/knowledge...es_general.htm


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post #10 of 17 Old 05-21-2014, 09:26 AM
imstillatwork
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Originally Posted by Ctjeep200 View Post
The link doesn't work.
The forum censored a word in the link - replace the *** with the correct word and the article loads.
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post #11 of 17 Old 05-21-2014, 09:47 AM
Beachcruiser
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Originally Posted by StanF View Post
Or possibly a stroker 4.7L, if that would make sense for you.
This is a great option, IMO.

My buddy has a 4.7 in his TJ and that thing is a Beast! He's got loads of low end, revs nicely and just flat out hauls.

IF/when my 4.2 ever goes south, I'm using the internals to build a stroker...no question.

probably out breaking stuff.
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post #12 of 17 Old 05-21-2014, 10:09 AM
hardluk
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^^^^. X2
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post #13 of 17 Old 05-21-2014, 11:03 AM
BCrawford64
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Here you go, get a clegg engine stroker kit (ebay), get a 505performance cam, 505 head, arp studs, new gasket set, new injectors, 99+ intake,....boom engine done. Then for a boost in hp, get a 3.8l ford thunderbird supercharger off ebay (a nice one) and run it directly to throttle body, no intercooler. Should make at least 325-350 hp if done right.
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post #14 of 17 Old 05-21-2014, 01:17 PM
Xpress
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Garage
Might as well toss in a fire breathing dragster engine if you're going to go through all that effort.

'96 ZJ 5.2L, IRO 3.5" lift, KOR radiator support, MVF steering brace, IronMan 1 Ton
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post #15 of 17 Old 05-21-2014, 02:42 PM
StanF
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Quote:
Originally Posted by BCrawford64 View Post
Here you go, get a clegg engine stroker kit (ebay), get a 505performance cam, 505 head, arp studs, new gasket set, new injectors, 99+ intake,....boom engine done. Then for a boost in hp, get a 3.8l ford thunderbird supercharger off ebay (a nice one) and run it directly to throttle body, no intercooler. Should make at least 325-350 hp if done right.
505Performance has one of the worst reputations that I've seen. There's way too many bad stories for me to ever give them any money...


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350 , 4.0 , motor swap , wrangler , YJ

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