4 Cylinder Engines in CJ7

I was wondering how good the 4 cylinder engines are in these jeeps. Is
it a good option for medium-core 4-wheeling on the cheap? I know the
I6's are great (I used to have a Cherokee), but will the I4 be a good
compromise with gas prices the way they are? Also how about the
longevity factor. How many miles can one expect to get out of this
engine?

Thanks in Advance
John

The 4 cyl and 6 cyl are both extremely durable engines. Both will run to
150k miles and up as long as they get decent maintenance and no serious
abuse (overheated or over reved) Off road, the only time the 4 is
outclassed is in mud bogs where you floor it and hope you get through.
The rest of the time there is no great difference between the 4 and 6.
Gas mileage is almost the same, no advantage to the 4 cyl. The only real
case for the 6 cyl is highway driving. The CJ7 has the aerodynamics of a
brick, for highway cruising or freeway ramps, you really want the hp of
the 6 cyl.

John Norman wrote:
> I was wondering how good the 4 cylinder engines are in these jeeps. Is
> it a good option for medium-core 4-wheeling on the cheap? I know the
> I6's are great (I used to have a Cherokee), but will the I4 be a good
> compromise with gas prices the way they are? Also how about the
> longevity factor. How many miles can one expect to get out of this
> engine?
>
> Thanks in Advance
> John

I can't believe you found a four cylinder still running in a CJ.
Usually they were all beaten to death trying to maintain traffic speeds.
God Bless America, Bill O|||||||O
http://www.billhughes.com/

John Norman wrote:
>
> I was wondering how good the 4 cylinder engines are in these jeeps. Is
> it a good option for medium-core 4-wheeling on the cheap? I know the
> I6's are great (I used to have a Cherokee), but will the I4 be a good
> compromise with gas prices the way they are? Also how about the
> longevity factor. How many miles can one expect to get out of this
> engine?
>
> Thanks in Advance
> John

Afaik, the four cylinder is a GM offering, with the same bell housing
pattern as a small block Chevy or the 4.3 liter V6. The 5.7 liter fuel
injected small block is an ever better compromise. ;^)

The I4 isn't so great for highway use, just because of the horrible
aerodynamics that you can't get away from with a vehicle shaped like a
shoebox, but off road you may have some advantage, and the axle ratio should
be the sensible 4.11 that they mated with four cylinder engines.

Longevity will depend on what the engine has been through in the past, and
what you do once you get it. A compression test would be a good idea.

Earle

"John Norman" > wrote in message
...
> I was wondering how good the 4 cylinder engines are in these jeeps. Is
> it a good option for medium-core 4-wheeling on the cheap? I know the
> I6's are great (I used to have a Cherokee), but will the I4 be a good
> compromise with gas prices the way they are? Also how about the
> longevity factor. How many miles can one expect to get out of this
> engine?
>
> Thanks in Advance
> John

Still a "Real Jeep" though...

"L.W.(Bill) Hughes III" > wrote in message
...
> I can't believe you found a four cylinder still running in a CJ.
> Usually they were all beaten to death trying to maintain traffic speeds.
> God Bless America, Bill O|||||||O
> http://www.billhughes.com/
>
> John Norman wrote:
>>
>> I was wondering how good the 4 cylinder engines are in these jeeps. Is
>> it a good option for medium-core 4-wheeling on the cheap? I know the
>> I6's are great (I used to have a Cherokee), but will the I4 be a good
>> compromise with gas prices the way they are? Also how about the
>> longevity factor. How many miles can one expect to get out of this
>> engine?
>>
>> Thanks in Advance
>> John

I don't think so, as I recall that engine is basically the 4.0 with two
cylinders missing.

Jeff DeWitt

Earle Horton wrote:
> Afaik, the four cylinder is a GM offering, with the same bell housing
> pattern as a small block Chevy or the 4.3 liter V6. The 5.7 liter fuel
> injected small block is an ever better compromise. ;^)
>
> The I4 isn't so great for highway use, just because of the horrible
> aerodynamics that you can't get away from with a vehicle shaped like a
> shoebox, but off road you may have some advantage, and the axle ratio should
> be the sensible 4.11 that they mated with four cylinder engines.
>
> Longevity will depend on what the engine has been through in the past, and
> what you do once you get it. A compression test would be a good idea.
>
> Earle
>
> "John Norman" > wrote in message
> ...
>
>>I was wondering how good the 4 cylinder engines are in these jeeps. Is
>>it a good option for medium-core 4-wheeling on the cheap? I know the
>>I6's are great (I used to have a Cherokee), but will the I4 be a good
>>compromise with gas prices the way they are? Also how about the
>>longevity factor. How many miles can one expect to get out of this
>>engine?
>>
>>Thanks in Advance
>>John
>
>
>

Umm, they didn't make the 4.0 when the CJ's were around. The 6 is a 4.2
from that era.

The later CJ 4 banger is a GM product.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Jeffrey DeWitt wrote:
>
> I don't think so, as I recall that engine is basically the 4.0 with two
> cylinders missing.
>
> Jeff DeWitt
>
> Earle Horton wrote:
> > Afaik, the four cylinder is a GM offering, with the same bell housing
> > pattern as a small block Chevy or the 4.3 liter V6. The 5.7 liter fuel
> > injected small block is an ever better compromise. ;^)
> >
> > The I4 isn't so great for highway use, just because of the horrible
> > aerodynamics that you can't get away from with a vehicle shaped like a
> > shoebox, but off road you may have some advantage, and the axle ratio should
> > be the sensible 4.11 that they mated with four cylinder engines.
> >
> > Longevity will depend on what the engine has been through in the past, and
> > what you do once you get it. A compression test would be a good idea.
> >
> > Earle
> >
> > "John Norman" > wrote in message
> > ...
> >
> >>I was wondering how good the 4 cylinder engines are in these jeeps. Is
> >>it a good option for medium-core 4-wheeling on the cheap? I know the
> >>I6's are great (I used to have a Cherokee), but will the I4 be a good
> >>compromise with gas prices the way they are? Also how about the
> >>longevity factor. How many miles can one expect to get out of this
> >>engine?
> >>
> >>Thanks in Advance
> >>John
> >
> >
> >

Maybe I'm misremembering but I seem to recall they needed a new 4cyl
engine and took the old six, removed two cylinders and redesigned the
head for better flow. The then took the "new" 4cyl engine and added two
cylinders to make the 4.0. For what it's worth both engines use the
same replacement pistons.

(Autozone says a Badger P830-20 for a .020 oversize piston for either
engine).

Jeff DeWitt

Mike Romain wrote:
> Umm, they didn't make the 4.0 when the CJ's were around. The 6 is a 4.2
> from that era.
>
> The later CJ 4 banger is a GM product.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)
>
> Jeffrey DeWitt wrote:
>
>>I don't think so, as I recall that engine is basically the 4.0 with two
>>cylinders missing.
>>
>>Jeff DeWitt
>>
>>Earle Horton wrote:
>>
>>>Afaik, the four cylinder is a GM offering, with the same bell housing
>>>pattern as a small block Chevy or the 4.3 liter V6. The 5.7 liter fuel
>>>injected small block is an ever better compromise. ;^)
>>>
>>>The I4 isn't so great for highway use, just because of the horrible
>>>aerodynamics that you can't get away from with a vehicle shaped like a
>>>shoebox, but off road you may have some advantage, and the axle ratio should
>>>be the sensible 4.11 that they mated with four cylinder engines.
>>>
>>>Longevity will depend on what the engine has been through in the past, and
>>>what you do once you get it. A compression test would be a good idea.
>>>
>>>Earle
>>>
>>>"John Norman" > wrote in message
...
>>>
>>>
>>>>I was wondering how good the 4 cylinder engines are in these jeeps. Is
>>>>it a good option for medium-core 4-wheeling on the cheap? I know the
>>>>I6's are great (I used to have a Cherokee), but will the I4 be a good
>>>>compromise with gas prices the way they are? Also how about the
>>>>longevity factor. How many miles can one expect to get out of this
>>>>engine?
>>>>
>>>>Thanks in Advance
>>>>John
>>>
>>>
>>>

Whatever, Just so long as you know it was originally a 1926 Nash
engine:
http://www.pnwnash.org/common/closeu...onid= &carid=
They just added a water pump and filter.
God Bless America, Bill O|||||||O
http://www.billhughes.com/

Jeffrey DeWitt wrote:
>
> Maybe I'm misremembering but I seem to recall they needed a new 4cyl
> engine and took the old six, removed two cylinders and redesigned the
> head for better flow. The then took the "new" 4cyl engine and added two
> cylinders to make the 4.0. For what it's worth both engines use the
> same replacement pistons.
>
> (Autozone says a Badger P830-20 for a .020 oversize piston for either
> engine).
>
> Jeff DeWitt

<G>

Jeff DeWitt

L.W.(Bill) Hughes III wrote:
> Whatever, Just so long as you know it was originally a 1926 Nash
> engine:
> http://www.pnwnash.org/common/closeu...onid= &carid=
> They just added a water pump and filter.
> God Bless America, Bill O|||||||O
> http://www.billhughes.com/
>
> Jeffrey DeWitt wrote:
>
>>Maybe I'm misremembering but I seem to recall they needed a new 4cyl
>>engine and took the old six, removed two cylinders and redesigned the
>>head for better flow. The then took the "new" 4cyl engine and added two
>>cylinders to make the 4.0. For what it's worth both engines use the
>>same replacement pistons.
>>
>>(Autozone says a Badger P830-20 for a .020 oversize piston for either
>>engine).
>>
>>Jeff DeWitt