4.6 stroker tech

Carolina YJ

Well-Known Member
Joined
Mar 30, 2005
Location
charlotte
need help building a stroker anybody done one willing to tell me how ands what i need
 
go to naxja.org and search...there are several formulas for doing this...and the price ranges are from fairly cheap to freaking ridiculous.
 
there is a guy here on the forum who just finished getting his built for his tj and i also have a buddy who just built one and put it in his cherokee, but he is not on the forum. the guy that built the one for the cherokee works at advance auto and got all the parts using his discount and then got a block from the junk yard and then got a local machine shop to do the machine work and then he put the rest together and threw it into his jeep. he said he actually improved his gas mileage by about 2 mpg. really wanting to do it to my tj.
 
Ive got one in my TJ. Total with machine work and rebuilding the motor at the same time was about $1400. Subtract about $200 if the machine work would have been done right the first time.

I was running 11.7 in the 1/8th mile on 33's and getting about 10-12mpg, and now I run 10.6 on 35's and get 14mpg.

I did all of the non-machine work myself. I can answer about any question you can think of.

Just to build the stroker, all you need is a 4.2L crank and rods, new crank and rod bearings, 14 spacers for clearance of the bearing girdle, and a different pilot bearing for the transmission input shaft depending on which transmission you have.

The pre-86 4.2L cranks are heavier and require a little machining to adapt your harmonic balancer.
The 87-91 4.2L cranks allow the balancer to bolt on.
Ive got an 87-91 version in mine and it makes PLENTY of torque.

Realistically, you will want to rebuild the motor when you stroke it. I rebuilt mine and had the rotating assembly balanced, and it runs smoother than a stock 4.0. Another possible issue is heat, which may force you into a more expensive radiator. I dealt with it for about 3 years, and finally put down the coin for a nice aluminum one that brought my highway temps from 230 to 190.
 
Carolina YJ said:
need help building a stroker anybody done one willing to tell me how ands what i need
Click to expand...


I can't check the site (cause my firewall at work is blocking it)...but I have this one bookmarked from some earlier research:

http://www.jeep4.0performance.4mg.com/stroker.html

best I recall...it's not the "how-to" kind of page, but rather it gives you quite a few options of how slippery of a slope you want to start down...:D

Greg
 
Yeah, I was gonna link that page when I got home, great idea resource with some good tech too.
 
I just finished building mine about a month and a half ago. Mostly 4.2 parts. make sure you do a complete build over and replace everything. I am also running a crower cam at about 10.5:1 compression. so plan on running premium.PM me if you have any questions
 
The guy Chris is talking about above is my friend David. He put it into his ZJ and that thing is AMAZING. He did some great work. I can get you in contact with him if you'd like more info or are looking for someone to build one up for you.
 
yeah that would be cool, maybe some help! i want to build as much as i can, not pay someone to do it, but yeah let me know if he is interested
 
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