4.0 performance tips - JeepForum.com

 
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post #1 of 11 Old 09-04-2012, 12:59 PM Thread Starter
jfisher1
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4.0 performance tips

Does anyone have any suggestions on cams for a 2000 sport with a 4.0? I was thinking of stroking it to a 4.6 any reviews ?
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post #2 of 11 Old 09-04-2012, 03:51 PM
stogie25
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My 4.7L stroker from Western Engine here in Denver has worked great for years. My last dyno had me at 336 horse power and 435 foot-pounds of torque @ 3400 RPM. That is with a cam, a lot of head work, exhaust work, custom chip, etc. It was not cheap. Even with all the extra weight on my Jeep it still gets up and goes.

I did it because I hydrolocked my 4.0L. As long as I was replacing it anyway, I figured why not. If I were just looking for power, and my motor was working well, I would consider just upgrading the cam. This requires pulling the head to get the lifters out of the way. Including a head gasket, cam, head bolts, fluids etc. you should be around $500.00 doing it yourself. It is a good weekend of tinkering with the Jeep.

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post #3 of 11 Old 09-05-2012, 12:18 AM
Marauder_Pilot
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There's not a ton you can do for the 4.0L without a turbo, super or stroker kit. And none of them offer great value for money-there aren't many options for all of them, they're all expensive, and, honestly, they're no easier and way cheaper than a 350 swap.

Stock, it's a fantastic engine, but it's not much of a tuner engine. Getting more from a 4.0L is, honestly, not worth the effort. A stroked, turbo'd or super'd 4.0L can get into the 400/500 HP/TQ range, but that's a $10,000+ investment all said and done.

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post #4 of 11 Old 09-05-2012, 09:36 AM
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Drive a 2.5L for a few years, you'll be amazed at the power output of a 4.0.

All about that unibody life.
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post #5 of 11 Old 09-05-2012, 11:02 AM
somebody5788
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Quote:
Originally Posted by Marauder_Pilot View Post
There's not a ton you can do for the 4.0L without a turbo, super or stroker kit. And none of them offer great value for money-there aren't many options for all of them, they're all expensive, and, honestly, they're no easier and way cheaper than a 350 swap.

Stock, it's a fantastic engine, but it's not much of a tuner engine. Getting more from a 4.0L is, honestly, not worth the effort. A stroked, turbo'd or super'd 4.0L can get into the 400/500 HP/TQ range, but that's a $10,000+ investment all said and done.
Mild cam + header back exhaust + 92-95 HO head.

The older 4.0 head can be used and has much higher flowing exhaust ports. The 99+ heads were shrunk for emissions reasons but offered a higher flowing intake to compensate for the power loss. An early head with the 99 intake and a mild cam could probably dyno 200hp+ to the wheels which is awesome compared to the stock like 190hp at the crank.

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post #6 of 11 Old 09-05-2012, 11:03 AM Thread Starter
jfisher1
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I was wondering about a 4.0 stroked to a 4.6 I saw a jeep that had it done this weekend but I never got to talk to the guy about it or even see how much it cost him .
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post #7 of 11 Old 09-05-2012, 11:11 AM
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Quote:
Originally Posted by somebody5788 View Post
Mild cam + header back exhaust + 92-95 HO head.

The older 4.0 head can be used and has much higher flowing exhaust ports. The 99+ heads were shrunk for emissions reasons but offered a higher flowing intake to compensate for the power loss. An early head with the 99 intake and a mild cam could probably dyno 200hp+ to the wheels which is awesome compared to the stock like 190hp at the crank.
Your ninja edit... I saw it.

Quote:
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No one really knows the reason for LCOG Jeeps.

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My issue was I couldn't get the balls centered. I had to use some extra force to get everything lined up right. It didn't take me long.


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post #8 of 11 Old 09-05-2012, 05:27 PM
somebody5788
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Your ninja edit... I saw it.
I did a couple... I shouldn't post stuff when I'm distracted by things like working hahaha

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post #9 of 11 Old 09-05-2012, 07:40 PM
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I edit a lot because my cat helps me type.

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97 Black TJ (one owner), BFG KM2 35s, 4.7L Stroker, ARB's, Dana60 rear, Dana30HP Front Warn manual hub conversion, 6 inch mostly Tera long arm lift. Rhino lined tub. Allied Rock 8 beadlocks. Tera-Low 4:1. Sanden OBA. Sniperfab tube fenders.

My Build Thread http://www.jeepforum.com/forum/f22/m.../#post12717920
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post #10 of 11 Old 09-05-2012, 08:33 PM
andy02
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Quote:
Originally Posted by somebody5788

I did a couple... I shouldn't post stuff when I'm distracted by things like working hahaha
I have the same problem.

Quote:
Originally Posted by Hendrix
No one really knows the reason for LCOG Jeeps.

Its so short ****s like me and you can still get in.
Quote:
Originally Posted by 2ACR View Post
My issue was I couldn't get the balls centered. I had to use some extra force to get everything lined up right. It didn't take me long.


September 11 2001
Never Forget!
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post #11 of 11 Old 09-09-2012, 11:50 PM
1slo_camaro
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so when searching, i want a head from a 92-95 4.0? and a 99+ intake? i think i have a collapsed lifter so im trying to find all the junkyard mods i can get. how can i tell if its a HO head or not?

1998 ZJ~~V.r 4~~4.0 with a bunch of fancy stuff that makes it look pretty sitting in the driveway.
PM me for 99+ intake manifolds for sale
$125-sandblasted and painted and shipped
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