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Old 08-30-2011, 02:13 AM   #1
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2.4l compared to 2.5l

I drive a 2.4l and i'm trying to make it run better so i've been looking around and most things, for example headers, are made for either the 4.0l or the 2.5l engines and from what I can tell the 2.4l isn't very similar to the 2.5l. Would the 2.5l mods work on a 2.4l?

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Old 08-30-2011, 03:39 AM   #2
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completely different engines that also probly have different bolt ups. 2.4L should respond a little better to mods than the old 2.5L but its still a 4cylinder. Gotta throw a turbo at it to get anywhere

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Old 08-30-2011, 09:51 AM   #3
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While we're (sort of) on the subject...

I bought a 2005 SE with the 2.4L engine/6-speed transmission new in '05. I like the 6-speed transmission, although the 5-speed in my daughter's 6-cylinder '98 is entirely adequate as well.

I would have much preferred the 2.5L 4-cylinder engine though. I had that engine in my '90 Cherokee and it was perfect for my use.

I wonder how difficult it would be to retrofit a 2.5L/5-speed combination into my '05 when the engine needs replacing? I plan to keep the '05 until I die so that I can watch my kids fight over it from the other side, so there WILL come a day when the 'replace or rebuild' question must be dealt with.

The mechanicals would be fairly straightforward, I imagine. It's the computer/wiring harness details I'm concerned with.

I thought this would be a likely thread to attract those who might know.
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Old 08-30-2011, 10:07 AM   #4
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The 2.4L is a dodge neon engine. I know throwing a turbo on it is easier than the 2.5L, but still very costly.

What size tire are you running with which gear ratio?
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Old 08-30-2011, 05:02 PM   #5
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Not sure what my ratio is, I have a set of 31s on right now and a set of 33s for the winter.
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Old 08-30-2011, 08:31 PM   #6
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you can swap the head and turbo from an SRT4 neon for some significant power gains with very little (relative) effort.
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Old 08-30-2011, 11:14 PM   #7
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The 2.4l is known as a 420a. The heads are almost 100% the same so swapping is a wast of time the best thing you could do is pistons and rods for higher comp or forced induction(or both don't ask i will post when it happens). The engine is very easy to work on and has many advantages over the 2.5 like aftermarket support and potential.
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Old 08-31-2011, 02:37 AM   #8
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thanks, so most things that would work on a srt4 2.4l and could fit in the wrangler will work?
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Old 08-31-2011, 04:09 AM   #9
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Pistons, rods, cams, injectors, manifolds, head-work. If you want more out of it check out eagle rods with wiseco 10.5:1 pistons and some variable cam pulies. This engine is a interference engine but not the pistons to valve, valve to valve so be careful if you mess with the cams.
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Old 09-03-2014, 06:51 PM   #10
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does the 2.5 L bell housing attache to 2.4 motor? i bricked my engine and am looking for the easiest match i read some where that the pcm or ecm has similar plugs for efi is there any truth to that?
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Old 09-05-2014, 12:37 AM   #11
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i wish i could do this in California, i am gonna get me a 6 cyl jeep

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