stroker motor build

[yj-woody]

I am building a stroker motor right now. 93 yj 4.0 block. Bored out 30 over.4.2 crank.4.2 rods. What I am looking for is my head springs are stock. So what cam do I use? Or can I use the stock one? And later next winter or when ever change head springs and cam out? Its going in a 93 yj 5speed. 8.8 locked. 33in tires 4.10 gears full body armor. And flat tube fenders. I am running a cold air intake. 2.25 exhaust with a flowmaster muffler. All said about this motor build would it be the 4.6 or 4.7. Thanks guys..

[Cheromaniac]

If you want to keep the engine simple and reliable, just use the stock cam with stock springs as I did. Your engine will displace 4587cc so it'll be a 4.6.

[yj-woody]

Ok found out my lifters and cam is not in the best shape. So in need of a cam and lifters. What cam will work with stock springed head? Thanks guys. I have looked but don't want to blow something apart.

[Cheromaniac]

There are a few cams on my spreadsheet at http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm with a valve lift of 0.45" or less and I suggest you go for the Crower 44243.

[Retlaw01XJ]

I suggest you go for the Crower 44243.

That's the one I chose. With the stock springs it revs nicely to the 5000 rpm shift point.
It's a tad more cam than stock, which I felt was a nice match to the extra cubes of the 4.6.
I can't offer any before/after driving impressions, as I barely drove my Jeep before the rebuild (just on and off the trailer!)

[yj-woody]

Thanks guys i am going to check out that cam..

[RayRay]

if you are looking for a great offroad cam to go in that id go for:
comp.68-232-4 extreme off road .460in.-.476ex.

it most definiately pumps up the power and has a very smooth but ready to pounce idle.

[Cheromaniac]

if you are looking for a great offroad cam to go in that id go for:
comp.68-232-4 extreme off road .460in.-.476ex.

it most definiately pumps up the power and has a very smooth but ready to pounce idle.

Agree. It does have those qualities but with that much valve lift you can't use the stock valve springs.

[yj-woody]

I have my motor almost built. And a guy just told me that i need a differnt computer to run this motor.. I haven't read anything about that. Is this true? Its going in a 93 yj. With a 5 speed trans. Thanks guys.. I did go with a stock cam. But new. Every cam i was looking to get was on back order. So stock it was..

[yj-woody]

Anybody know? Thanks

[604rail_king]

Untrue. Stock PCM is fine however you could add a map adjuster or piggy back controller to tune your WOT a/f's if you wanted to

[SilverXJ]

Your stock computer will be fine. I do recommend larger injectors. You can control the open loop AFR with a MAP sensor adjuster or a fuel pressure regulator.

[yj-woody]

Thank you guys. I am putting in the ford injectors. What should the fuel pressure be set at? If i get a regulator..

[604rail_king]

no need for an adj fpr with the larger ford 24# injectors.

[Cheromaniac]

Thank you guys. I am putting in the ford injectors. What should the fuel pressure be set at? If i get a regulator..

I'm running the stock computer, stock FPR, and Ford 24lb injectors but with my homebrew MAP adjuster set slightly higher than stock at 5.3v. The engine pulls like a freight train all the way from 800-5200rpm with no bucking or hesitation and driveability is excellent.