oh and i almost forget, depending of the clearance i might deck the block a tiny bit to help me raise the compression ration

 

Subbed. Interested to see how much power you get out of that 2.5 and how reliable it is once stroked. I'm pretty committed to doing a V8 install in mine but this is worth watching regardless.

 

called 505 performance, they re saying that the kit without the race head is pushing 140 lb ft to the ground @ 3500 rpm.... not bad at all

 

i will keep on the thread too. i like to hear when people try new things and doing some work to the good ol 2.5 sounds cool

 

could be a nice little motor. with the right gears in the axles and 4:1 t-case should crawl great.

I'm keeping my 2.5 stock for now but might build a 4 banger for a buggy down the road.

 

could be a nice little motor. with the right gears in the axles and 4:1 t-case should crawl great.

I'm keeping my 2.5 stock for now but might build a 4 banger for a buggy down the road.

Eventually i want 4:56 with 33in tires

 

140ft lb at the back wheels is a pretty significant leap over stock, which is probably somewhere around 95ft lb.. Wonder if the AX5 will handle it?

 

i dont think so, thats why ill rebuild a ax15 as well before putting it in

 

the transmission doesnt have to be an AX-15, the back of the 2.5L Jeep engine is the "GM corporate pattern" or sometimes called the "GM Metric pattern", also called the "GM 60 degree pattern" and there is a ton of bell housings that will bolt to the 2.5L.

96-00 Dakota 2.5L bellhousing, Connects all to any Jeep 2.5L L4. Because of it's GM 60 degree V6 inherited bolt pattern, also works with any Buick FWD V6 and supercharged V6, any Chevrolet 2.8/3.1/3.4 V6, any Cadillac 4.1/4.5/4.9 V8 and with a minor modification, any Olds Aurora DOHC V8 and Cadillac DOHC Northstar V8. Also bolts to any Isuzu 3.2\3.5 DOHC V6.

So that is a wide range of 4x4 transmissions to choose from, also a wide range of engines that will swap in where your 2.5 is, the mounts and ECMs are of course the hard part, and the electronics package has to be done from scratch if you go to an AW4 but Stew Wilson has done this and he has a lot of good info on his site about that exact swap.

You can also go to an AW4 transmission using a Isuzu Rodeo 3.2/3.5 bellhousing which has the GM 60 degree pattern and will bolt to your 2.5. Other 60 degree engine options are a supercharged 3800, Aurora V8, or Northstar and LS4.

The upshot is this, you can upgrade to a far better transmission of your choice, build the 2.5 stroker, and if you decide you want to go a different route at some point you have a plethera of engines to choose from that have the same bolt pattern as your 2.5, no matter what you'll have to fabricate mounts, so have fun with it.

Right now I'm building for my 2.5l TJ this -

Fiero 2.8 (painted to match Jeep) - Isuzu bell housing - AW4 - Atlas II

So you can do almost anything with any type of engine, keep in mind a 9500 rpm wont help you so the ricer engines arent good, but for low end torque most of the Isuzu / GM 60 degree LS and V6 engines and Cummins 4BT diesels can be rebuilt for ultimate low rpm torque.

Let your imagination be your guide and your bank account be your anchor and have fun

 

couple considerations

What will that increase in torque be used for?

What will it buy you?

Is 3500 rpm a practical rpm for the application of that torque?

Is it a trail Jeep or a race Jeep?

Too many times people get focused on 1 or 2 aspects of a project and neglect an overall look at all aspects of it.

I believe the I6 4.0 is 200+ ftlbs at 1200 rpm and up. Very flat. Not as exciting or unique as a stroked 2.5, but....

 

What will that increase in torque be used for?

What will it buy you?

A nice project that ll be way cheaper to put in than the 4.0 plus i kinda love the idea of a big 4 banger

Is 3500 rpm a practical rpm for the application of that torque?

In my case, Yes, the whole powerband gets up, more power to work with plus i would like to run 33s and still be able to be a DD without to much of an PITA to drive

Is it a trail Jeep or a race Jeep?

Mostly a daily driver Jeep, the head im not sure yet if i really want it.... im afraid ill need to rev it to the moon (which i dont want) to produce any kind of power

Too many times people get focused on 1 or 2 aspects of a project and neglect an overall look at all aspects of it.

Yeah but still learning men

I believe the I6 4.0 is 200+ ftlbs at 1200 rpm and up. Very flat. Not as exciting or unique as a stroked 2.5, but....

i love the idea too

 

BTW after some digging the G54 transmission from toyota is almost the same thing as a AX5 (bolt-on swap).... back on the drawing board since that one have a really good reputation in the Toyota World...

 

Wouldn't be surprised, Toyota primarily uses Aisin transmissions.

 

I love hearing new projects like this. Cant wait to see how it turns out.

 

Subbed can't wait to see the outcome

 

Sorry for being a moron but what would this entail?

I'd love to beef up my 2.5 when ever the rebuild comes around and if I'd be able to sniff 140rwhp I'd be estatic

New Transmission - yes
New Rods - yes
New Pistons - yes
New Injectors (Assuming use ford 24#) yes
New Cams - yes

Do you keep the same head? Same block?

 

New transmission, either a G58 from toyota (an ax5 build with stronger component) or an Ax15 swap.
New rod, hell yeah some 4340 I beam rod same lenght
New pistons but .30 bigger, i dont wanna go too big might have cooling issues otherwise
they have some 24 lbs injectors coming with the kit so ill use them
i have the choice between 3 camshafts but i dunno which one ill go with, i dont wanna have to rev it to the moon to have power

Ill simply go with the race head that they re selling,for 575$ itw way cheaper than rebuilding, porting, polishin and buying stiffer spring (camshaft) new rocker(mileage) etc etc.

Same block : Yes but cleaned and bored .30 over

im interested to put Timing gear instead of a chain (had that on my drag car loved the sound of it) but i cant find a kit for the 2.5....

 

hmm G54 bolt up to a 2.5...that means toyota t-case(s)

 

2 weeks before spare block cant wait!!!!

 

That race head is moving a lot of air at .500 lift And it has over 2 inch intake and 1.6 exhaust. I would be careful about loosing port velocity and thereby low end torque with a race head. If your not turning the rpm to support the head the motor will be lazy down low.

 

Depending of which cam you use 505 performance were saying that if i use the proper camshaft itll help me having more torque than the stock head depending where the cam is suppose to be.... but i have to be honest im doing a lot of research right now for that reason, i dont wanna loose all of the low end torque but having a crazy amount in the upper RPM

 

If your going to the AX-15, think about 4.88s, I have the 2.5 / AX5 and 4.88s on 33"s and I have to watch my sped, it will creep up to 70 or 75 without any effort.

 

4.88 i think its too high for what im planning to do with it

 

Transmission fix! the tranny fluid was brown i flushed it and replaced it and i had air in the clutch system

 

How's this going?

 

Slow as hell got sent on exercise

 

Im a newbee to all the mechanical stuff, but after reading the forum for a couple of months its good to see someone doing things with the 2.5. IMHO it gets such a bad rap in general. Im in, and anxious to see your outcome!!!

 

Im still reading and wish you the best.

 

Tanks men

 

i asked about the 2.5 stoker earlier on another thread here and got made fun of. lol. I think it'd be cool to improve the little four banger. sure it might take some bucks, as will any swap, but you wont have to custom make any mounts or anything! bolt right in. definitely subbing. lol.

 

i asked about the 2.5 stoker earlier on another thread here and got made fun of. lol.

I guess I don't get the appeal. Let's say you put $2000 into custom decking and machine work, built internals, etc. and you get another 30 HP out of it. Now you're at what, 150HP? Wouldn't it make more sense to take that same money and do a swap for a more stout motor? Not making fun of you or anything, just trying to understand why this would be an option when it seems the payout is inadequate. Other than the "because I can" factor, what's the appeal?

Denis

 

After reading some of the horror stories connected to buying some of the "remanufactured engines" I went on 505 webb site after reading your post and considering purchasing one of their 2.5 stroker engines! I t will just take that much longer to save for it.

 

The problem is you cannot change the issues the 2.5 has just by bolting stuff on and it in it. For an extra thirty horse put a bottle on it,,,,the result will be the same.