Stroker Advice Sought

[AZJeff]

OK, guys, I have decided to rebuild the engine in my MJ. As my sig line says, it's actually a 4.0 from a 2000XJ, so it's not a Renix system, obviously.

 

I am debating doing a “stroker” when I do the rebuild, but I have some concerns/questions.

 

The first (and most important question) is “will the stroker still meet the emissions standards of a standard (non-stroked) engine?” I am in a part of AZ that requires emissions testing, so I cannot create an engine that won't meet he EPA emissions standards for a 1989 vehicle.

 

Secondly, I have read some stuff on various ways to create a stroker, and the more I read, the more confused I get as to all the possible ways to stroke the 4.0 Is there some website (or is someone here on CC) that can tell me how to create a relatively cost effective stroker? I really am not trying to all out in increasing torque/HP with my rebuild, but I figure if I am redoing the engine, maybe I should try to give it a bit of a bump while I have it apart.

 

Your wisdom is appreciated.

[cruiser54]

First, score a 258 crank and rods. 

Rebuild your 4.0 with those. 

Search on the web. "Poor Man's Stroker".

[ghetdjc320]

Here is a nice resource to get some general info: https://www.angelfire.com/my/fan/stroker.html

 

The Jeep Strokers forum is also very helpful.

 

Most of us who have built 4.0 based strokers have nothing but great things to say about Russ Pottenger at Bishop Buehl Racing. Shoot him an email once you get an idea of the direction you want to go and he can get you a kit put together. He’s super helpful. I would suggest avoiding Hesco, Clifford or 505 Performance. NewComer Racing also has some great stuff but they are very pricey. 

[derf]

There are lots of options.  From guides on what parts to find and do it on the cheap to various kits to full crate engines.  It just depends on your budget.  Look up the information listed above.

 

As far as emissions, that depends on your build.  A mild camshaft and the right injectors will let you run a factory computer and be in the right spot to pass a sniffer test.