MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

2.5 swap?

Old 07-24-2016, 11:20 AM
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Default 2.5 swap?

Hi guys I just got my hands on a 1986 MJ 5-speed and was wondering would it be wise to swap out the tired 2.8 V6 for a 2.5 4cyl for reliability purposes. Or if its possible thanks guys!
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Old 07-24-2016, 06:24 PM
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I tried searching online but only found people swapping to 3.1 or 3.4, 4.0s.
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Old 07-24-2016, 07:32 PM
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It will fit but you have to wire up the engine as the 2.5L has a TBI unit instead of carb. Easiest and cheapest route is to find a 3.4L (160-180hp) V6 from a Camaro. Its a direct swap (except having to neutral balance the flywheel) and has more power.
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Old 07-24-2016, 07:56 PM
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Originally Posted by Outlaw Star View Post
It will fit but you have to wire up the engine as the 2.5L has a TBI unit instead of carb. Easiest and cheapest route is to find a 3.4L (160-180hp) V6 from a Camaro. Its a direct swap (except having to neutral balance the flywheel) and has more power.
what year camero? And neutral balance the Camaro flywheel?
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Old 07-24-2016, 09:03 PM
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Originally Posted by cherokeexj21 View Post
what year camero? And neutral balance the Camaro flywheel?
Neutral balance the 2.8L flywheel. The 2.8L flywheel is weighted to balance the engine, the 3.4L is balanced at the crank. You will also use all front end acc and brackets from the 2.8L along with intake manifold and carb. All you swap is block for block.
As for year, I believe it's around 93-97 era.
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Old 07-24-2016, 09:15 PM
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Originally Posted by Outlaw Star View Post
Neutral balance the 2.8L flywheel. The 2.8L flywheel is weighted to balance the engine, the 3.4L is balanced at the crank. You will also use all front end acc and brackets from the 2.8L along with intake manifold and carb. All you swap is block for block. As for year, I believe it's around 93-97 era.
ok cool thank you very much I appreciate it. Just one last question do I get an electric fuel pump or the 3.4 has a mechanical pump too?
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Old 07-24-2016, 09:50 PM
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Originally Posted by cherokeexj21 View Post
ok cool thank you very much I appreciate it. Just one last question do I get an electric fuel pump or the 3.4 has a mechanical pump too?
You need to wire up an electric pump and pressure regulator because the 3.4L has no mechanical pump.
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Old 07-25-2016, 09:57 AM
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Haven't heard of 2.8 to 2.5, but anything is possible. If you want a diesel try the VW 1.9, there are kits for that. Here's a good article on Jeep engine swaps that shouldn't happen if you happen to change your mind:

http://www.fourwheeler.com/how-to/en...ne-swaps-ever/

Last edited by Ad-HocXJ; 07-25-2016 at 10:01 AM.
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Old 07-25-2016, 03:29 PM
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Originally Posted by Ad-HocXJ View Post
Haven't heard of 2.8 to 2.5, but anything is possible. If you want a diesel try the VW 1.9, there are kits for that. Here's a good article on Jeep engine swaps that shouldn't happen if you happen to change your mind: http://www.fourwheeler.com/how-to/en...ne-swaps-ever/
that's real cool but I think that's alittle to much for me right now lol
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