The perfect Jeep engine

[AndyG]

Is the 4.0 the perfect engine for a Jeep , or if you could tell Jeep what to put in one, what would it be?

I love the 4.0 all around, but wonder.....what would I want if the 4.0 didn’t exist?

 

[Boinked]

1.9l tdi diesel.

 

[Chris]

Well, since we'd only be able to choose another Chrysler / Mopar engine (since they wouldn't put an off-brand engine in it from the factory), a Hemi would be the obvious choice.

 

[Boinked]

Well, since we'd only be able to choose another Chrysler / Mopar engine (since they wouldn't put an off-brand engine in it from the factory), a Hemi would be the obvious choice.

But other automakers do it. My wife's ford has a Mazda transmission

 

[AndyG]

I’m game....,any engine. It’s all academic at this point.

 

[TJ_2000]

4.0 I6
R28 Cummins
4BT Cummins
Any small turbo diesel really.

Those are the best motors for a TJ.

Gas motors suck. Aside from the 4.0. It’s only saving grace is the fact it’s an in-line. If it was a V6 it would suck.

 

[Flivver250]

The 4.2 is a good engine, the 4.0 is a good engine. While I like diesels for pulling, I'll wager the cost per mile to maintain one is far greater than a simple inline gasser. I have heard people say diesels last forever, however forever comes with a pretty hefty price tag when it comes to diesel maintenance and repair. Also, when you can easily get 300K out of a gasser and then buy a fresh long block for a couple grand, it is pretty hard to beat that. With today's lubricants, fuels and engines, maintained gassers seem to last as long as maintained diesels.

 

[Jeepaholic]

I really like gm ls engines. I'd say a 5.3 ls. 285-355 hp, stupid reliable, and aftermarket support, and easy to upgrade to the larger ls if you wanted. If my 4.0 or the 6 speed ever gives up, that's what mine is going to get.

 

[L J]

1. LS3




2. anything else

 

[alittleoff]

GM 383 Stroker, 4 bbl, NV4500, 5:1 Atlas, RJ 60's.

 

[Squatch]

But other automakers do it. My wife's ford has a Mazda transmission

...and my daughter's Mazda MPV has a Ford engine...

 

[Flivver250]

I really like gm ls engines. I'd say a 5.3 ls. 285-355 hp, stupid reliable, and aftermarket support, and easy to upgrade to the larger ls if you wanted. If my 4.0 or the 6 speed ever gives up, that's what mine is going to get.

GM gassers have always been good. The 5.3 is pretty bulletproof. Hell, the old 250 straight six was a good engine as was the old 4.3 V-6. The Ford inline 300-6 was a tough rig too. UPS used them for years. How about a 1970 Olds rocket 350?

 

[Mike_H]

Ford and Mazda were more than kissing cousins for quite a few years. All the American OEMs did "technology exchanges" with Japanese companies when they were trying to get better. In fact, the original duramax engine is basically an Isuzu.

 

[mots]

4.0 with turbo and IC (keep it mostly stock)
Turbo Diesel - something like the TD6 3.0 v6 from Jaguar/Land Rover
HEMI

 

[jeepins]

If you went with an alternative and reliable straight 6 then the Ford 300/I6 would be perfect.

 

[JDS123]

If the swap was feasible I'd want a 4BT, 6BT, or a 7.3L. Obviously they are too heavy and there are a myriad of other problems when it comes to swapping them in, but if it worked, I'd want it. I'm a huge fan of older, simple, reliable diesels.

 

[Flivver250]

How about a Pontiac 389 tri-power? Not that a big block makes physical sense space-wise, but you would be the coolest TJ guy around.

 

[Shatto]

https://www.edmunds.com/car-news/2016-jeep-wrangler-to-get-diesel-engine.html

 

[Cudabnu]

VW V10 TDI
Base engine size 5.0 liters
Base engine type V-10
Horsepower 310 hp
Horsepower rpm 3,750
Torque 553 lb-ft.
Torque rpm 2,000

 

[tworley]

Never driven one, or seen it in person, but I think the R2.8L would be great. The kit is designed to work with the stock trans and axles (AX15 and 44). So the cost of upgrading the driveline is gone (unless you have a 2.5 setup). Not that my rig is in poor shape, but when it blows this would be the replacement I would look at. Not for fuel economy, as that would take years to break even on cost and fuel savings, but the power and torque would be great to have:coleman: