What's the pros/cons of putting a later model I4 in a YJ? want MPG
Hello, I am new to jeeps. I used to build GM musclcars and liked to cram big V8's where they don't belong. I guess I'm getting old, I have a YJ I4 w/ a million miles, and I am contemplating a later model I4 drivetrain. I don't necessarily need more power, but I am looking for some decent mileage if possible (w/o sacrificing the off-road gearing). I plan on using this for trail riding mainly, but I don't want it to cost an arm and a leg to get there. I don't know anything about the chrysler family of engines and drivetrain interchangeability between models, so can someone give me the basics. I understand I need to carry over PCM and make some adaptions, but but what drops in without major surgery and I can source from a junkyard donor? I don't need a 6 and if I can connect it to my AX5 that would be even better since it's rebuilt.
You'd find better economy in a v8 fuel injected motor swap since it would be the same amount of work.
The 2.4 isn't any better than the 2.5 for economy and power and it doesn't mate to the ax-5, almost nothing other than the 2.5 does.
Most do indeed get much better economy from v8's than the stock jeep offerings.
Otherwise, just throw in a reman 2.5.
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.
thanks for the insight. I guess I can search the yards for some sort of GM engine. either V8 or V6 as long as it's common and got SFI. I know there are adapters out there, am I right in assuming I need a RWD engine? I also wanna stick w/ a manual tranny. obviously I need to do more reasearch, but having trouble finding anything more than dropping a SBC w/ auto-trans. prob gonna rebuld the I4 for now, but there's always scheming.
I am sure you could adapt the 2.4 to your trans but while the 2.4 has more horsepower it is high in the rpm range and the 2.5 has more torque. For trail riding the 2.5 is a better option. Typically for most people the 4.0 gets as good or better mileage than the 4cyls. You could source all of the items to switch to a 4.0 and probably get the trans at the same time.
Always bring a compass, it is awkward to have to eat your friends.
cool, i guess 4.0 is a good option unless I come across a deal on a gm drivetrain, but those rarely include manual trannys. I'm gonna run the 2.5 into the ground but just need a game plan and MPG is the only thing that sucks about this rig. my train of thought is updating to a newer engine w/ more efficient management/components/etc will give more streetablilty whithout sacrificing trail riding. the diesel option seems intriguing, but gotta learn more.
I used to build GM musclcars + I have a YJ I4 w/ a million miles + I don't necessarily need more power = I guess I'm getting old
Do the math, yeah, thats a downhill roll for sure, and you're almost at the bottom. Hell yes you're getting old. There are pills though. I'm twice your age and still not old.
I agree with most of the above guys that prety much any normal motor swap has the same work, so why bother with another low power 4 cyl. You have the last Jeep made with a 'normal' dashboard and gauge system, before the world went OBDII and CAN BUS, so that part is easier too.