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post #1 of (permalink) Old 12-15-2000, 02:29 AM
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2.5 L 4cly jeep engine question

these little 4 cly jeep engines, like the one in my 95 wrangler, are they high rpm engines? i mean will running them at 4000rpm's for a sustained rate of time like on the high way kill it or, even going that high hurt it? i run about 3200rpms on the highway and just wondered if its bad for the engine or not r if there little 4 bangers can take the high rpms with out problems, i just don't wanna break my engine ..espically with a gear change which will make the rpms higher.. thanks!

1988 Wrangler Laredo 4.2L w/5spd Manual
1995 Wrangler 2.5L w/ 5spd / 31"BFG AT's
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post #2 of (permalink) Old 12-15-2000, 03:02 AM
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Re: 2.5 L 4cly jeep engine question

My MJ made 365K before the rebuild. My dad owned the truck before me and drove about 95 highway miles a day. He passed it on to me when it had about 250K. I drove about 60 percent highway. That is with the stock 215/75/R15.

I see you have 31" BFG's. I just put 235/75's BFG AT's on for the winter and I must say I am more than pleased. Since you have a bigger tire, you don't have to go as fast as stock to get the same speed. The rear end is 4.10 in all 2.5L (according to a few on the XJ/MJ/etc. board). You plan to go steeper than that???

'88 MJ SporTruck
365K on 2.5L (Energizer Bunny Package)
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post #3 of (permalink) Old 12-16-2000, 05:07 PM
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Re: 2.5 L 4cly jeep engine question

I believe that most 4 bangers are pretty tough. I own a 94 YJ 2.5 and drive it as I need to. I wouldn't make a habit of running it over 4000 rpm but if you need it to pass I'd do it.


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