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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?
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I doubt it's factory.
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No not with .40 cal pistols in it :rolleyes:
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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.
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There's not a huge difference in power between the older engines and the HO.
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Max allowable overbore for the 4.0 is .030".
With .040" overbore it's not an HO, it's a time bomb. |
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. __________________ |
Originally Posted by cruiser54
(Post 3305466)
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? 🍻 |
Whaddya wanna know? Simple stuff?
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HO stands for Highly Overrated. Nailed it dude!
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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! |
Originally Posted by Fred/N0AZZ
(Post 3304977)
No not with .40 cal pistols in it :rolleyes:
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