4.0 high output Cherokee engine
09-12-2016, 11:22 PM
#1
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Model: Cherokee
4.0 high output Cherokee engine
I have a 95 jeep cherokee high output and it has a 4.0. I took it apart to put in new lifters and camshaft and found that the pistols have a 40 over stamp on them. Is this factory or aftermarket?
09-13-2016, 08:44 AM
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I doubt it's factory.
09-13-2016, 04:43 PM
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Sounds like a heck of an engine. My son's xj has tons more back end than my zj, always wondered if it was a HO.
09-13-2016, 08:34 PM
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
There's not a huge difference in power between the older engines and the HO.
09-14-2016, 08:18 AM
#7
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I will post this for anyone who is curious:
HO myth buster
Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference.
HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this?
It’s only a 4% horsepower increase…..
The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold.
Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it.
HO stands for Highly Overrated.
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HO myth buster
Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference.
HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this?
It’s only a 4% horsepower increase…..
The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold.
Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it.
HO stands for Highly Overrated.
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09-14-2016, 08:36 AM
#8
I will post this for anyone who is curious: HO myth buster Renix in 90 made 182 HP. HO in 91 made 190 HP. That's 8 HP difference. HO only made more HP than Renix at higher RPMs and not a bit more torque. HO had a 58 mm throttle body versus a 52 mm throttle body on a Renix. That’s 20% more air available through the HO throttle body. The HO also had a better design header. See where I'm going with this? It’s only a 4% horsepower increase….. The whole 8HP was not mostly from the head, but from the bigger TB and better exhaust manifold. Put a 60mm TB from www.strokedjeep.com on your present manifold using the Renix head, eliminate the "crush" in your headpipe with proper re-routing, and go for it. HO stands for Highly Overrated. __________________
In the future, we will expect more from you on the subject. Supercharging, perhaps! Or maybe how to swap in an AMX 390? 🍻
09-14-2016, 08:47 AM
#9
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Whaddya wanna know? Simple stuff?
09-14-2016, 09:03 AM
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Model: Cherokee
3.875 bore on a 4.0L, amiright?
he could certainly have .040 pistons.... why not? but, what are they referencing being .040 over? another AMC/Mopar/Jeep 4.0L?
break out the micrometer, you.... and get a pic of those faces!
he could certainly have .040 pistons.... why not? but, what are they referencing being .040 over? another AMC/Mopar/Jeep 4.0L?
break out the micrometer, you.... and get a pic of those faces!
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