I am planning on making a stroker out of my 90 xj. My plans are as follows

4.2 litr 258 ci crankshaft (getting one from the local yard)

Head from a H.O jeep (with computer)
- mustang injectors
- chevy valve springs
- ported and polished

Performance roller cam with roller lifters and rokers

Plan on going .30 overhaul

And all the other ugrades with follow after engine is complete.

Please throw out any comments or concerns. I am aware of various barriers but my ears are always open.

 

pointers are welcome

 

I kinda need help with this also for my 97 but maybe its just the first time jitters lol

 

I'm also in the market for a stroker build.. I was considering doing 505performance's stroker build but it's a hefty price and I don't know too much about the company other then they specialize in jeeps. Or if their products are reliable For that matter. But The kit comes with your basic stuff bottom end wise.

 

please tell me that you are not seriously boring it out 0.300" and stay away from roller lifter cuz you have to always keep an eye on the adjustment of them

 

can u piece together a "budget" stroker kit? im not very savy at motor building

 

http://www.ajeepthing.com/stroker-motor.html

 

Of course i plan on going .30 over, possibly .40it all depends. With the bigger injectors and valve springs its all going to make a big difference in the long run. The rollers aren't that big of a deal. Once they are set and the break in period is done I'll do a valve check and reset accordingly. I want to do rollers because i will eventually be installing a turbo down the the road but thats after i get all the sensors and computer mapping done. I want to make sure that i have my six covered for the installment of the turbo, rollers will help alot with the boost/gains. Dragsters want less weight - I want less friction with my setup to sustain a higher RPM at longer durations.

What were some of the problems you experienced and or why do you think an overhaul is bad? Just want some insight, like i said I'm all ears.

 

Nothing wrong with going .30 over, i would only be worried at .60-.80 over... which i wouldnt recommend over .60 really.

 

In my opinion that is the best way to save dinero. Go to some yards and find yourself a jeep that has a 4.2 ltr (258 ci) inline 6. These engines have a crankshaft the same length as the 4.0 ltr (242 ci) but it has a longer stroke "hence the term stroker". There are several things to consider when doing this.

Jeepjunkie provided a link that should help.

 

Yeah I don't want to go extreme on the overhaul just a little to up the combustion. Once i get the upgraded injectors, i've read that 5.0 mustang injectors work well, and do some head work i can get a noticeable gain by that alone. When i retire from the Marine Corps i want to do a diesel conversion. Check out dieselbruiser.com its pretty wild. They use a 4bt cummins engines. Of course they charge a butt-load but you can do it yourself for a ton less. Good info though.

 

Do you guys know how or a link that i can check engine casting numbers and crank numbers just to confirm my j-yard finds?

 

Went to the yard today and pulled the 4.2 crankshaft. That was a job, the engine was still attached to the tranny. I paid $10 to have it put on its side to get it out armed with the tools i brought with me and some elbow grease. The guy said good luck and i went to work. I will take pics of the crank and number as well as the seats tomorrow

 

either both of you guys messed up, or you guys dont know that much. but 0.600 (6 hundred thousandths of an inch) is over a half inch of boring, there is absolutely no way that is possible. i just really hope you guys mean 0.030 (30 thousandths of an inch) with a max of 0.060 (60 thousandths of an inch). if you take the block to any engine builder and say " i want 0.300 bored out." he will do 1 of 2 things, 1 laugh his *** of at you, or give you the weirdest look you have ever seen.

 

No not messed up just not gettin as technical and yes we both mean .030. Dont take this personal but try decaf, you wont get on edge as much! LOL! You are right none the less, the correct way to communicate that measure is in fact .030.

Let me ask you this... What modifications would i need if any to use a head from a high output motor? Seems to me the only difference in the " low output " and the high output are the heads. I know it is recommended to use the later model heads when building a stroker.