Well I was just wondering if what high output means, I have a 1997 Jeep Cherokee sport and wanted to know if I was equipped with a high output motor and tranny.

My jeep is a little loud by itself and is very quick if that means anything..

 

You should Have the HO.

 

HO is the change from Renix to OBDII injection, this alone netted some extra HP from the 4.0 mill.
They also changed the head for better flow and this picked up a few more.
AFAIK all the 4.0's after Renix injection was retired became HO.

 

They are not labeled as HO.

 

The injection like stated above was improved with the H.O., and also the throttle body is improved I believe. (Anyone verify this?)

 

Any Jeep with a 4.0 inline six built after 1991 has the high output engine.

 

^^This

 

couple more hp, different cam and heads, etc.
Its just Chrysler being Chrysler... They like to name everything.

• 1987 4.0L (242 CID) I6 RENIX FI 242 - 173 hp (129 kW) @ 4600 rpm, 224 lb·ft (304 N·m) @ 4000 rpm
• 1988-1990 4.0L (242 CID) I6 RENIX FI 242 - 177 hp (132 kW) @ 4600 rpm, 225 lb·ft (305 N·m) @ 4000 rpm
• 1991-1995 4.0L (242 CID) I6 MPI (High Output) - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
• 1996 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
• 1996-1999 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lb·ft (319 N·m) @ 3200 rpm
• 2000-2001 4.0L (242 CID) I6 MPI "Power Tech" - 193 hp (144 kW) @ 4600 rpm, 243 lb·ft (329 N·m) @ 3200 rpm

 

HEADS??? HEAD lol sry

 

no.. HEADS, plural. Many different kinds.
"different cam" should of been "different cams" Plural, once again. They changed a couple times too.

 

Silly question. It means that the crankshaft is about twelve inches higher off the ground than it is in most other vehicles - which we Jeep owners consider to be lower output, relatively speaking.

 

What does High Output mean? it means the amount of cash that flows from your wallet to the parts store

 

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.
__________________

 

Went diggin' in the crypt for this one, eh?

 

Nah. Somebody accidentally reported it. Took the opportunity to respond.