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Post by xjeeper on Nov 20, 2008 18:59:16 GMT -5
i have a spare 4.0 from a 99 n my garage that im planning on building up a little bit before i put it in my jeep. As of now my plans include a better cam with longer duration and more lift, port matching the head to the intake/exhaust, and shaving some off of the head.
I need suggestions for a cam and how much would be safe to take off the head? If anyone has any suggestions or any helpful information post up. thanks alot
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crosbike
 
Swap Shop Cop
choo choo
Posts: 6,389
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Post by crosbike on Nov 20, 2008 19:09:16 GMT -5
just throwing it out there. slap a 4.2 crank in there and make it a stroker. dont have to bore it out at all....i may do this with my spare engine.
as for the cam i have no idea.
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XJLI
The Nina, The Pinta, The Santa Maria.
Posts: 6,923
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Post by XJLI on Nov 20, 2008 19:16:00 GMT -5
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Post by rckrdyxj on Nov 20, 2008 19:16:57 GMT -5
Do roller rockers too.
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Post by xjeeper on Nov 20, 2008 20:32:14 GMT -5
roller rockers are pointless for a rock crawler. they are good for strength and durability but wont do anything for performance. |
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KtmRacer419
Unibody Connoisseur
straight outta 05
Posts: 7,424
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Post by KtmRacer419 on Nov 20, 2008 22:08:42 GMT -5
you will have a jeep with more engine mods than adam
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XJLI
The Nina, The Pinta, The Santa Maria.
Posts: 6,923
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Post by XJLI on Nov 22, 2008 1:41:10 GMT -5
you will have a jeep with more engine mods than adam nevar. roller rockers will increase engine response and also lubricate the top end better. |
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CSaddict
PayPal hater
I love Newbs.
Posts: 3,889
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Post by CSaddict on Nov 22, 2008 7:34:50 GMT -5
Internal engine builds are nice but you will also need to think about engine management and air delivery to make the most of those changes. Since you are OBDII you could use a Unichip piggy back that is fuel and ignition adjustable to make changes. A guy with a 4.0 XJ just had his tuned on the dyno at J and M. He had all the work you have described plus a bigger TB, header and some after market exhaust.
His results after spending all that money would make you put a gun in your mouth. lol. The numbers weren't much better than most stockers. A few hp and a few ft/lbs if I remember correctly.
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Post by rckrdyxj on Nov 22, 2008 10:20:04 GMT -5
So then what needs to be done to make good improvements on a 4.0? Stroker?
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Mike
No, I don't tip, why?
Posts: 3,928
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Post by Mike on Nov 22, 2008 12:38:32 GMT -5
or supercharger
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CSaddict
PayPal hater
I love Newbs.
Posts: 3,889
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Post by CSaddict on Nov 22, 2008 14:07:53 GMT -5
Stroker would be a good start but for the money I would do some sort of forced induction.
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Post by Rev. AL on Nov 22, 2008 18:10:25 GMT -5
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to every one of my posts.
