Engine swap!

Jeepster wrote:
> On Apr 8, 10:17 pm, "Earle Horton" > wrote:
>> "Mike Romain" > wrote in message
>>
>> g.com...
>>
>>
>>
>>> Jeepster wrote:
>>>> On Apr 8, 11:48 am, Mike Romain > wrote:
>>>>> Jeepster wrote:
>>>>>> I have an 88 YJ with a 2.5, but I am interested in swapping it. I
>>>>>> have an AMC 258 out of a 77 CJ available to me. How difficult of a
>>>>>> swap would that be? Did those engines have the same motor and
>>>>>> transmission mounts or did the 258 change a lot from 77 to the 88
>>>>>> version. I can get the engine cheap, but I don't see any point in
>>>>>> doing that if it will cause my a bunch of hassle. I need an easy swap!
>>>>> The tranny won't take a 258 without an adapter I believe. The bell
>>>>> housing is different for the 4 banger and the center shaft size is
>>>>> different although the pilot bushing in the CJ crank can be swapped with
>>>>> a YJ pilot bearing.
>>>>> Mike
>>>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>>>> 'New' frame in the works for '08. Some Canadian Bush Trip and Build
>>>>> Photos:http://mikeromainjeeptrips.shutterfly.com
>>>> Thanks Mike,
>>>> Do you know if an '88 258 would match up or am I looking at the same
>>>> issues with that as well?
>>>> Keegan
>>> It's the 4 banger bell housing that is the issue. You might want to try
>>> places like advance adapter to see what the adapter plate runs. The pilot
>>> bushing to bearing swap is simple.
>>> Mike
>> The AX-5 transmission is rumored to be weak for six cylinder use. In fact,
>> the earlier carbureted engine Wranglers used the 258 that Jeepster is
>> thinking of using in front of the AX-5 and similar transmissions. Newer
>> ones use the heavier duty AX-15. This conversion could be done using OEM
>> parts. If you can identify and find the right bell housing then you are
>> well on your way. That said, no conversion is as easy, and an "easy swap"
>> just does not exist, not when you get done with exhaust, clutch linkage,
>> motor mounts and all the rest. The 2.5 engines are all fuel injected and
>> the 258s are carbureted. That means a different fuel tank and all the
>> plumbing that goes with. If you can get a wrecked or rusted through
>> Wrangler or Cherokee of the same year, you might do this conversion with a
>> minumum of fuss.
>>
>> I have driven a four cylinder Wrangler for fourteen years and am well
>> satisfied with it. "custom EFI system with a Turbo" and "I am on a budget
>> and its cheap!" just don't go together. What do you think that custom EFI
>> and turbo are going to do to a thirty year old essentially junk yard engine?
>> I have a pretty good idea myself. In this guy's place I would keep driving
>> the vehicle as is, and maybe give the four cylinder engine a ring job,
>> bearings, valves, whatever it needs.
>>
>> Earle
>
> In this case they might, I already have an EFI setup I just need to
> adapt it to whatever manifold the engine I get has and program it, as
> for the turbo, a guy I work with has an old turbo off of an old diesel
> rig that I would use. I am well aware that just throwing this stuff
> on an old engine would be potentially disastrous, I would rebuild the
> 258 stronger and the 8:1 compression ratio of this particular year 258
> is desirable for implementation of a turbo. This engine would be a
> project engine, something for fun! I plan on running the jeep with
> the 4 until it gives up then swap it out, maybe with something even
> better.
>
> Keegan

Projects are fun! Keep us posted. You should be able to find the right
bellhousing. Lots of folks swap out trannys and that age of Jeep is also
junkyard fodder as a parts source.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08. Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com

On Sun, 13 Apr 2008 16:09:42 -0400, "M Warren" >
wrote:

>> The AX-5 transmission is rumored to be weak for six cylinder use. In
>> fact, the earlier carbureted engine Wranglers used the 258 that Jeepster
>> is thinking of using in front of the AX-5 and similar transmissions.
>> Newer ones use the heavier duty AX-15. This conversion could be done
>> using OEM parts. If you can identify and find the right bell housing then
>> you are well on your way. That said, no conversion is as easy, and an
>> "easy swap" just does not exist, not when you get done with exhaust,
>> clutch linkage, motor mounts and all the rest. The 2.5 engines are all
>> fuel injected and the 258s are carbureted. That means a different fuel
>> tank and all the plumbing that goes with. If you can get a wrecked or
>> rusted through Wrangler or Cherokee of the same year, you might do this
>> conversion with a minumum of fuss.
>
>Two things here, one is that not all 2.5's are FI, 1991 was the first year
>that the 4cyl's (or YJ's in general) were fuel injected. The other thing
>being that in an '88 there is a very good chance that he has the BA-5
>(french) tranny, which makes it even less favorable for a swap.
>
>

Earle is correct. All 2.5L YJs were fuel injected. 87 - 90 had Renix
throttle body injection. 91 and later had Chrysler's system on them.

The six cylinders.
God Bless America, Bill O|||||||O

http://www.billhughes.com/jeep_bookmark.htm

"M Warren" > wrote in message
...
> Huh, I would have sworn I saw carb'd uns.... thanks for the correction.
>
> Matt


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