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Author Topic: 2.5 rebuild  (Read 4314 times)

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Offline RickBrins

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2.5 rebuild
« on: July 08, 2015, 08:41:11 PM »
1995 2.5, engine is out and apart, the good news is that it doesn't look too bad in side.  (Sorry, no pictures, I was not around for the teardown).  I will need a new cam and lifters and will see if the crank can be machined, I will have the block bored and surfaced, the other obvious gaskets, bearings, seals, oil pump, timing chain, etc.  Now the questions......
1) Stock cam or something else?  (Mostly a daily driver, highway,  light off road, 30x9.5 tires)
2) roller lifters?  (Are they worth the $450)
3) ignition?
4) injectors?
5) Anything else I am missing?

Mainly looking for an easier highway cruise, possibly a little more mpg, and reliability.

I have a 4.0 throttle body, headers and high flow cat and exhaust.  Other than that, ,it is mostly stock.  I made it to 240, 000 miles on this engine, would have gone longer, but my 16 year old does not understand the importance of oil.

I know there are many threads on here about mods, but I will listen to any suggestions you ,may have fopr my particular needs.

Thanks in advance!

I'm thrilled to be a member of this forum again, you all are very helpful and most are very knowledgable!
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline RickBrins

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Re: 2.5 rebuild
« Reply #1 on: July 08, 2015, 09:50:07 PM »
I forgot to add that I have a TB spacer.

I found a set of remanufactured Bosch Yellow top injectors for $100, are remanufactured injectors ok? Also it is a set of 8, does anyone want the other 4 if I get them?
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline RickBrins

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Re: 2.5 rebuild
« Reply #2 on: July 09, 2015, 07:58:39 PM »
So far, I am finding that...

 my best chance of Roller Rockers is Yella-Terra for $450, I'm still not convinced the gains will be worth the cost, but would love to hear frpom someone with experience

The FireWire Ignition System seems to be worth the time and money to install

The Bosch 19# injectors are cheap enough to give a try

Still unsure if I can find a performance cam, or if it will help me much with my typical drive

Slight bore to clean up the block

Any other thoughts?
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline grumpygy

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Re: 2.5 rebuild
« Reply #3 on: July 09, 2015, 09:49:59 PM »
Never heard of Fire Wire.  But I like http://performancedistributors.com/product/jeep/
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94 YJ, Cool Air intake, 19lb Inj, 4.0 Throttlebody with spacer,  31/10.50/15's

Offline RickBrins

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Re: 2.5 rebuild
« Reply #4 on: July 09, 2015, 10:06:04 PM »
That is the one I was looking at, I meant FirePower, not fire wire...but I liked what I saw and also read Jeffy's comments on it.
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline VA_YJ

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  • Now I need a CJ...
Re: 2.5 rebuild
« Reply #5 on: July 10, 2015, 02:24:41 PM »
You forgot about one important mod: the 2.5L Low Output sticker  :biggrin:

Regearing is the most significant performance mod, but with 30" tires and your uses/objectives it doesn't make sense.
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95 YJ, 31 BFG ATs, 4.0 TB & spacer, Banks header, DynoMax CAT back, 19# inj, AEM CAI, 20 gal mod, Optima yellow
98 TJ, 35 BFG Krawlers, 4.0 liter, ax15, atlas 5:1, armor, Super 88 (under construction)
96 XJ Cheep Cherokee, 33s, 4.0 liter, AW4, future project
89 Waggy, 360 V8 727 dana 44s, it runs

Offline RickBrins

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Re: 2.5 rebuild
« Reply #6 on: July 10, 2015, 02:32:51 PM »
The machine shop has the head and crank to do what is necessary to get that much together, still not sure how much over I will have to bore, but I trust the shop.

1) I gave up on a performance cam, I guess I will just go new stock with lifters.

2) I have the Bosche stage III injectors ordered.

3) I have decided on the Jeep FirePower Ignition Kit

4) Gonna pass on the Roller rockers, just don't see the benefit for the $450

5) New Oil pump and timing chain

6) New water pump

7) Seals, bearings, and gaskets

8) slight port and polish on the heads

Next question.....what else should get some attention before it goes back in?

Any other sensors, vacuum lines, etc?
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline RickBrins

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Re: 2.5 rebuild
« Reply #7 on: July 10, 2015, 02:34:43 PM »
Thanks again for taking the time to offer advice!
« Last Edit: July 10, 2015, 02:39:44 PM by RickBrins »
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline RickBrins

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Re: 2.5 rebuild
« Reply #8 on: July 10, 2015, 02:38:36 PM »
Quote from: VA_YJ on July 10, 2015, 02:24:41 PM
You forgot about one important mod: the 2.5L Low Output sticker  :biggrin:

Regearing is the most significant performance mod, but with 30" tires and your uses/objectives it doesn't make sense.

I agree totally, I think the stock gearing is sufficient for now.  Not really looking for killer power and don't expect it out of this engine, also don't expect fabulous mpg, but a little more of both might be nice if I can find it.  While I have it apart.

I'm designing my sticker now. :dance:
« Last Edit: July 10, 2015, 02:41:13 PM by RickBrins »
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline VA_YJ

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  • Now I need a CJ...
Re: 2.5 rebuild
« Reply #9 on: July 10, 2015, 03:02:12 PM »
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95 YJ, 31 BFG ATs, 4.0 TB & spacer, Banks header, DynoMax CAT back, 19# inj, AEM CAI, 20 gal mod, Optima yellow
98 TJ, 35 BFG Krawlers, 4.0 liter, ax15, atlas 5:1, armor, Super 88 (under construction)
96 XJ Cheep Cherokee, 33s, 4.0 liter, AW4, future project
89 Waggy, 360 V8 727 dana 44s, it runs

Offline DanMarino

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Re: 2.5 rebuild
« Reply #10 on: July 21, 2015, 06:50:15 AM »
My 1994 2.5 has 200,000 miles.  So how did you know that your engine needed to be rebuilt?
Mine runs great, but I was wondering when it makes sense to put on a new timing chain set, or what would be an indicator that the engine needed to be replaced or rebuilt?

Thanks,
Tom
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Offline RickBrins

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Re: 2.5 rebuild
« Reply #11 on: July 21, 2015, 07:50:30 AM »
At 240,000 miles I got a great indicator that it was time to rebuild, my 17 year old son drove it for a a couple of months and never checked the oil, the rod knock was obvious to me, he thought it sounded a little off.

If yours is running good, drive it, if you have the time and $, freshen it up, but I think I could have gotten 300,000 + out of mine if it had oil in it. :brick: :brick: :brick:
« Last Edit: July 21, 2015, 07:52:00 AM by RickBrins »
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline special4

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Re: 2.5 rebuild
« Reply #12 on: July 21, 2015, 10:24:43 AM »
Hello
What car use this bosch stage3 injectors? who make the fire power ignition kit? do you have more torque in lower rpm“s or higher ?
thanks
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Offline RickBrins

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Re: 2.5 rebuild
« Reply #13 on: July 21, 2015, 10:33:03 AM »
I am still waiting for the block to come back from the machine shop, so I don't know exactly what I will see different, but according to the posts on here that talk about them, they are good mods.

The injectors are Ford GT injectors, I found rebuilt ones on eBay, set of 4 around $65.

Performance Distributors makes the FirePower ignition.

Both mods have really good posts on the boards with excellent information.
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95 YJ, K&N airfilter in an opened up stock box, 4.0 THTL body, spacer, Headers, Free flow cat and exhaust, 20 gal tank mod, 30 x 9.5 BFG's

Offline jfrabat

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Re: 2.5 rebuild
« Reply #14 on: July 22, 2015, 09:29:19 AM »
For some reason, my Jeep does not like the screaming demon coil.  I keep burning them...  I know I am the odd one out there, but I have gone through 3 of them already, so I kind of gave up on them.  Other than my case, i have not heard any complaints from other users, so it must be something with my Jeep.
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'94 YJ 2.5L with 4" RE lift, Superwinch EPi9.0, FoMoCo e-Fan, SD30 and SD35 w/ARB-5.13, 165A alt., 33" BFG KM2 on 15" AR wheels, Sony sound system, Pavement Ends Hardtop, Hydroboost
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