Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: fha772 on April 20, 2016, 09:29:32 AM

Title: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: fha772 on April 20, 2016, 09:29:32 AM

Hi all,

I'm having a bit of a dilemma, I can't decide what engine to fit in my CJ6 project.

I fitting a T18 manual box, and I don't know whether to go with a 360 V8, or to fit a more modern 4.0 I6 out of a XJ Cherokee.

I hope you guys can help with my decision

I loved the 4.0 in my old XJ, but I still like the V8 rumble.

I've already got a 360 out of a car, with a 4 barrel and tube headers.

What are your opinions on these 2 engines?

What are the pros and cons of each?

Cheers Frank.

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Green Jeep on April 20, 2016, 09:32:30 AM

V8 will give you more smiles per mile....  :icon_super:

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: wildwood on April 20, 2016, 11:09:38 AM

T18 loves a V8 and with that low first......rock crawling will be a breeze......

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Delk on April 20, 2016, 11:54:19 AM

What are you doing with the Jeep?

The V8 is far more fun but the 4.0 comes with fuel injection for everyday driving.

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: wildwood on April 20, 2016, 12:10:36 PM

 :iagree:
If you are going to travel all over the country then the YJ engine and all the fuel injection advantages will get you 15 -18 on 31 s or 33s

V8 might be down in single digits with 35s and a heavy right foot......

Also unless you are a carb guru or have an Edelbrock then off camber and hill climbs and descents will cause fuel starvation or flooding.......or stick with the Motorcraft AMC carb

The XJ/ YJ engine will run on its side.......(how did I find that out?)

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: doctorchopper on April 20, 2016, 01:36:31 PM

If you already have a v8 then i'd say go for it, unless its going to be a daily driver then might cost too much to run. Or put a fuel injection system like this http://www.affordable-fuel-injection.com/product/jeep-amc-tbi-complete-system/ onto your v8

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: willo on April 20, 2016, 01:40:10 PM

chevvy LM7 5.3 V8 that I have for sale :97:

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: JamesH on April 20, 2016, 03:34:29 PM

It depends what you want to use it for. I'd suggest that the 4.0 with a Cherokee autobox but that does seem a bit sensible and wimpy compared to a big V8 with manual box.

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Bubba on April 21, 2016, 05:46:58 AM

v8

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Dave69 on April 21, 2016, 06:28:32 AM

Willo's V8

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: IrishCJ6 on April 21, 2016, 08:33:23 AM

I have the 360 in my 6, lots of fun

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: 5536paulj on April 21, 2016, 05:56:03 PM

V8 all the way, can't beat the rumble, will run at almost any angle with the motorcraft carb, as Jez said

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: UKJeeper on April 22, 2016, 08:30:26 AM

4BT.

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: fha772 on April 22, 2016, 08:37:26 AM

I did think of dropping a Cummins in, but a 4bt is hard to find,  and the 6bt that I've got in the yard is a bit big and heavy, even compared to the 360...

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: wildwood on April 22, 2016, 09:25:25 AM

Cummins are great but as you said......weight..... :jpshakehead:

Narrow power band for off road abuse

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Mike Pavelin on April 22, 2016, 03:00:39 PM

Lexus RX400 hybrid so you can sneak up on ramblers and SCARE them :003:

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: wildwood on April 22, 2016, 03:16:24 PM

There's an,idea.....1990 or later Lexus LS400 and all running gear.........


I think there's one floating around on Birty's already......

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: Bulldog67 on April 22, 2016, 04:04:47 PM

Quote from: Willo on April 20, 2016, 01:40:10 PM

chevvy LM7 5.3 V8 that I have for sale :97:

One day I will crack and sell the 401 and have it  :97:


V8 mate - its a V8 FFS - its an unfair competition

Title: Re: Which engine, for my CJ6 project, 360 V8, or 4.0 I6?
Post by: UKJeeper on April 22, 2016, 09:50:47 PM

Quote from: Mike on April 22, 2016, 03:00:39 PM

Lexus RX400 hybrid so you can sneak up on ramblers and SCARE them :003:

https://www.youtube.com/watch?v=YfMirsvzHZ0

Or

https://www.youtube.com/watch?v=XmQacVCwTEU

Or

http://gas2.org/2014/11/06/classic-jeep-cj5-converted-electric/