4BT Conversion kit - JeepForum.com

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post #1 of 35 Old 08-07-2011, 01:50 PM Thread Starter
Prot
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4BT Conversion kit

I stumbled across this yesterday and thought I would share. 4BT conversion for a JK

http://www.riverraider.com/store/ind...product_id=156

I wish it wasn't so cost prohibitive otherwise I would be all over this without hesitation. As it is, if my engine blows up, this is probably what I would replace it with.


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post #2 of 35 Old 08-07-2011, 02:14 PM
Jos360
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The 4bt doesn't have a whole lot of power though. I'd guess it would make a horrible daily driver...

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post #3 of 35 Old 08-07-2011, 02:16 PM
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Quote:
Originally Posted by Jos360 View Post
The 4bt doesn't have a whole lot of power though. I'd guess it would make a horrible daily driver...
From their site:
Q) What type of horsepower and torque numbers should I expect with a base 4bt.
A) The average 4bt makes 120 horse and 385 ft/lbs of torque @ 1900 rpm's. The motors that we build are 250 horse and
492 ft/lbs of torque@ 2700 rpm's (remember the more power the less economy).

I'm thinking w/ those numbers it would make an excellent daily driver... + the increase of fuel economy w/ Diesel.... Mmmmmm Torque.

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post #4 of 35 Old 08-07-2011, 02:23 PM
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That does indeed sound better. Is that with better injection and intercooling maybe?

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post #5 of 35 Old 08-07-2011, 02:32 PM
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Would it be street legal in VA? That's tempting! If my JK wasn't my daily drive and I had my own shop... Hmmmm
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post #6 of 35 Old 08-07-2011, 02:56 PM
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That is amazing. A 4BT in a JK would be a beast out here. Adding this one to the wishlist for the '07.


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post #7 of 35 Old 08-07-2011, 07:17 PM
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Subscribed and very considered..........................

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post #8 of 35 Old 08-08-2011, 02:50 PM
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There site says you'll get about 27 miles per gallon. I image that that is stock. What if I put 35s and re-gear the diffs? I'm wondering if the miles per gallon hit wouldn't be as much as a stock 3.8 since the diesel is a high torque power train. Anyone agree or disagree? I'm not a mechanical engineer so I really I'm just dreaming. 8-)
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post #9 of 35 Old 08-08-2011, 03:02 PM
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The 4BT makes plenty of power. The motor was originally marketed to push around those big boxy bread trucks.

You don't need a lot of horses if your gearing allows you to utilize the torque you put out, and the 4BT almost doubles the 3.8 in torque.
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post #10 of 35 Old 08-08-2011, 03:35 PM
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$9,800 for a kit without a engine or transmission? No thank you...

I need to get back in to seeing what it'll take to get the partial remains of diesel Wrangler (so it'd be considered parts) in from the UK and transplant a Motori in to my JK. I swear it'd be far cheaper than this.
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post #11 of 35 Old 08-08-2011, 04:01 PM
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Shipping a motor from UK will probably be a few hundred would be my guess.

So it shouldn't be too bad. However, you're going to have to pay for that **** in pounds most likely, so you instantly almost double the cost Also, be advised you need an entire new chassis to make it work right I believe (or at least, you did for the Liberty's).

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post #12 of 35 Old 08-08-2011, 04:07 PM
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Quote:
Originally Posted by tavic
$9,800 for a kit without a engine or transmission? No thank you...

I need to get back in to seeing what it'll take to get the partial remains of diesel Wrangler (so it'd be considered parts) in from the UK and transplant a Motori in to my JK. I swear it'd be far cheaper than this.
People who do this swap swear up and down you can pick up low mileage 4bt w/ tranny for $2500 or less easily. There's a pretty long and comprehensive thread about this on JKOwners. Check it out, also has videos of the swap in action

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post #13 of 35 Old 08-08-2011, 04:17 PM
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Quote:
Originally Posted by Coppage
There site says you'll get about 27 miles per gallon. I image that that is stock. What if I put 35s and re-gear the diffs? I'm wondering if the miles per gallon hit wouldn't be as much as a stock 3.8 since the diesel is a high torque power train. Anyone agree or disagree? I'm not a mechanical engineer so I really I'm just dreaming. 8-)
Their (Jeff's Jeep Yard) JK on 40s gets 26mpg in town and 30+ on highway according to this thread http://www.jkowners.com/forum/showth...version&page=2

08 JK lots to do...
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post #14 of 35 Old 08-09-2011, 03:33 PM
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If you guys want a Diesel Jeep from the factory, head over to http://JeepDieselPetition.com and sign the petition!

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post #15 of 35 Old 08-09-2011, 04:59 PM
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The rig Jeff had at Jeep Beach was sick.. you just burp the throttle and you you already in the torque.


And I know i can't do this with my 3.8 and 40's.. lol


If I didn't have a wedding to pay for my junk would be at his shop.. lol

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