aftermarket cams in the 4.0 - JeepForum.com

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post #1 of 21 Old 02-25-2008, 01:22 PM Thread Starter
4.0l sahara
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aftermarket cams in the 4.0

Well I was reading a few articles about cams for the 4.0 and they all said they worked well in the 4.0. I had thought about it before but never done any thing about it. For me the install of it is no prob. I was looking at the cams made for low end and read that this was a good cam for the 4.0
http://www.compperformancegroupstore...tegory_Code=A6
Will this pass emissions in ct? It's not that crazy of a cam so I don't know if it will. Anybody here run one of these and what do you think.

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post #2 of 21 Old 02-25-2008, 02:58 PM
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Were they by any chance selling cams?

I would think that if they worked well in the 4.0 lots of people would have them, instead of ...roughly.... no one?
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post #3 of 21 Old 02-25-2008, 03:44 PM
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JP magazine has a review this month of improvements for the 4.0 and cams were listed as their best bang for the buck.
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post #4 of 21 Old 02-25-2008, 03:57 PM Thread Starter
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Thats where I read about them. In most engines cams can help alot. There also not that much $$
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post #5 of 21 Old 02-25-2008, 04:00 PM Thread Starter
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Also if I had to Gauss why alot of people don't have them is because they don't know how or want to dig that far into a 4.0.
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post #6 of 21 Old 02-25-2008, 04:06 PM
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Quote:
Originally Posted by 4.0l sahara View Post
Also if I had to Gauss why alot of people don't have them is because they don't know how or want to dig that far into a 4.0.
I would guess that it's because the 4.0L is already a torque monster and is not a high hp engine. Most people would rather spend the money on gears and then the rest on lift/tires/armor/etc...

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post #7 of 21 Old 02-25-2008, 04:09 PM
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From the comp cam link all I got was this: (Online cam specs not available for this cam) when I went looking for the specs on the cam. What are they tring to hide?
Cams for computer controlled engine aren't really all that comlicated. If you keep the can small enough to get good vacume at idle then the computer for the most part will be happy.

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post #8 of 21 Old 02-25-2008, 04:22 PM Thread Starter
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Quote:
Originally Posted by nitecop View Post
From the comp cam link all I got was this: (Online cam specs not available for this cam) when I went looking for the specs on the cam. What are they tring to hide?
Cams for computer controlled engine aren't really all that comlicated. If you keep the can small enough to get good vacume at idle then the computer for the most part will be happy.
Thats the cam they used on the jp web site in the 4.0 I also couldn't get the specs I wanted to see what the lift/duration and overlap was.
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post #9 of 21 Old 02-25-2008, 04:35 PM
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post #10 of 21 Old 02-25-2008, 05:32 PM
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would guess that it's because the 4.0L is already a torque monster and is not a high hp engine. Most people would rather spend the money on gears and then the rest on lift/tires/armor/etc...

"Torque monster"?? I don't think so at 220 foot pounds. It won't spin 33's worth a darn. Even a little 318 Dodge V8 will make a 100 more fp's at only
235hp or thereabouts.

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post #11 of 21 Old 02-25-2008, 05:49 PM
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Quote:
Originally Posted by Whybu1 View Post
JP magazine has a review this month of improvements for the 4.0 and cams were listed as their best bang for the buck.
Read further into that issue and you'll find that they had lobes go flat on the very upgrade they recommend! The engine they tested took a crap on them twice and they just had the original put back in the XJ.
The engine upgrade article in the April issue is the biggest source of contradiction I've ever seen.
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post #12 of 21 Old 02-25-2008, 05:58 PM Thread Starter
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I did read that the comp and crane cams had some probs. Most of there cams are good too. Do they nor harden them alot or somthing? What other cams are out there. I wonder if comp and crane will correct these probs?
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post #13 of 21 Old 02-25-2008, 06:14 PM
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Quote:
Originally Posted by 4.0l sahara View Post
I did read that the comp and crane cams had some probs. Most of there cams are good too. Do they nor harden them alot or somthing? What other cams are out there. I wonder if comp and crane will correct these probs?
The new SM rated motor oils are helping matters with older cam designs either.
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post #14 of 21 Old 02-25-2008, 06:40 PM Thread Starter
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Why is that? What did they remove or add?
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post #15 of 21 Old 02-25-2008, 09:01 PM
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Quote:
Originally Posted by ToyTJ View Post
would guess that it's because the 4.0L is already a torque monster and is not a high hp engine. Most people would rather spend the money on gears and then the rest on lift/tires/armor/etc...

"Torque monster"?? I don't think so at 220 foot pounds. It won't spin 33's worth a darn. Even a little 318 Dodge V8 will make a 100 more fp's at only
235hp or thereabouts.

Speak for yourself, I have no problem spinning my 35's on dry pavement posi.

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