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What does High Output mean?

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Old 03-31-2011, 04:52 PM   #1
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Default What does High Output mean?

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..
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Old 03-31-2011, 04:54 PM   #2
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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.
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Old 03-31-2011, 04:58 PM   #3
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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.
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Old 03-31-2011, 05:15 PM   #4
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They are not labeled as HO.
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Old 03-31-2011, 05:24 PM   #5
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The injection like stated above was improved with the H.O., and also the throttle body is improved I believe. (Anyone verify this?)
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Old 03-31-2011, 06:06 PM   #6
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Any Jeep with a 4.0 inline six built after 1991 has the high output engine.
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Old 03-31-2011, 06:22 PM   #7
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Any Jeep with a 4.0 inline six built after 1991 has the high output engine.
^^This
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Old 03-31-2011, 06:36 PM   #8
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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 lbft (304 Nm) @ 4000 rpm
  • 1988-1990 4.0L (242 CID) I6 RENIX FI 242 - 177 hp (132 kW) @ 4600 rpm, 225 lbft (305 Nm) @ 4000 rpm
  • 1991-1995 4.0L (242 CID) I6 MPI (High Output) - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 1996 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 1996-1999 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 2000-2001 4.0L (242 CID) I6 MPI "Power Tech" - 193 hp (144 kW) @ 4600 rpm, 243 lbft (329 Nm) @ 3200 rpm
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Old 04-01-2011, 03:00 PM   #9
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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 lbft (304 Nm) @ 4000 rpm
  • 1988-1990 4.0L (242 CID) I6 RENIX FI 242 - 177 hp (132 kW) @ 4600 rpm, 225 lbft (305 Nm) @ 4000 rpm
  • 1991-1995 4.0L (242 CID) I6 MPI (High Output) - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 1996 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 1996-1999 4.0L (242 CID) I6 MPI (High Output) **Chrysler Block Cast** - 190 hp (142 kW) @ 4600 rpm, 235 lbft (319 Nm) @ 3200 rpm
  • 2000-2001 4.0L (242 CID) I6 MPI "Power Tech" - 193 hp (144 kW) @ 4600 rpm, 243 lbft (329 Nm) @ 3200 rpm
HEADS??? HEAD lol sry
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Old 04-01-2011, 06:10 PM   #10
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no.. HEADS, plural. Many different kinds.
"different cam" should of been "different cams" Plural, once again. They changed a couple times too.
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Old 04-02-2011, 08:25 PM   #11
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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..
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.
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Old 04-02-2011, 08:42 PM   #12
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What does High Output mean? it means the amount of cash that flows from your wallet to the parts store
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Old 07-12-2017, 09:02 AM   #13
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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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Old 07-12-2017, 04:30 PM   #14
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Went diggin' in the crypt for this one, eh?
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Old 07-12-2017, 04:37 PM   #15
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Went diggin' in the crypt for this one, eh?
Nah. Somebody accidentally reported it. Took the opportunity to respond.
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