Petrol or Diesel?? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 10-26-2011, 02:49 PM   #1
Newb
 
Join Date: Oct 2011
Posts: 4
Petrol or Diesel??

I'm just about to buy my first Wrangler. Question I'm pondering is whether to buy the diesel 2.8L or 3.8L Petrol. Every person I've spoken to has another opinion.

Would appreciate some advise from experienced peeps?

Raymond7905 is offline   Quote Quick Reply
Old 10-26-2011, 02:52 PM   #2
Jeeper
 
Join Date: Aug 2011
Location: Ohio
Posts: 1,251
Buy the illusive diesel.

__________________
'14 Anvil JKUR (sold the '12 at 52K miles)
'13 unlimited stripped sport (red one)
'13 JKU sport (blue one)
'10 Unlimited sport (other red one)
'08 Unlimited X (green one)
3JKs1H1 is offline   Quote Quick Reply
Old 10-26-2011, 02:53 PM   #3
MallCrawler

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 37,347
The choice
kjeeper10 is online now   Quote Quick Reply
Old 10-26-2011, 02:54 PM   #4
Jeeper
 
Join Date: Oct 2011
Location: Camden, AR
Posts: 445
I would give almost anything to have that choice to make.

The diesel would be my choice.
rivershark2005 is offline   Quote Quick Reply
Old 10-26-2011, 04:14 PM   #5
MTH
Jeeper
 
MTH's Avatar
 
Join Date: Oct 2010
Location: North Carolina
Posts: 8,553
I've never driven the diesel, but I've heard good things about it. Certainly more good things than I've heard about the 3.8.

I think it's worth noting however that the J8--which is Jeep's military grade Wrangler (google it)--is offered with either that diesel engine or a Hemi V8. The 3.8 is not an option.
__________________
Mike
2010 JKU "Mountain" Edition
TeraFlex 2.5" Coil Lift : Old Man Emu Nitrocharger Shocks : 33x12.5R15 Goodyear DuraTracs : 15x8 Black Rock 909s : Other Stuff . . .
MTH is offline   Quote Quick Reply
Old 10-26-2011, 04:17 PM   #6
The Bad Guy

WF Supporting Member
 
daggo66's Avatar
 
Join Date: May 2009
Location: NJ exile living in Baltimore
Posts: 22,295
That settles it. No J8 for me!
__________________
Tom

"I've got two things in this world, my balls and my word and I don't break them for no one."
daggo66 is offline   Quote Quick Reply
Old 10-26-2011, 04:25 PM   #7
Jeeper
 
Bazzer's Avatar
 
Join Date: Oct 2010
Location: England
Posts: 275
Which would you prefer, 18mpg or 28mpg?
Would you like torque to climb ascents without needing to change down gears?

It's horse's for course's, I have the 2.8 diesel and I love it. Better fuel economy, more torque and better acceleration for the road. Better pulling power if you tow or drive off road.

Mine cruises at 70mph to 80mph and still returns 28mpg, in UK gallons.
__________________
2008 JK Sahara Sport, Bright Silver Metallic 2.8 Diesel, 6 speed manual. 28mpg
Bazzer is offline   Quote Quick Reply
Old 10-26-2011, 04:38 PM   #8
MTH
Jeeper
 
MTH's Avatar
 
Join Date: Oct 2010
Location: North Carolina
Posts: 8,553
Quote:
Originally Posted by Bazzer View Post
Mine cruises at 70mph to 80mph and still returns 28mpg, in UK gallons.
That's 23 mpgs for us U.S. based folks. About 4 or 5 mpgs more than the stock 3.8 does on the highway.
__________________
Mike
2010 JKU "Mountain" Edition
TeraFlex 2.5" Coil Lift : Old Man Emu Nitrocharger Shocks : 33x12.5R15 Goodyear DuraTracs : 15x8 Black Rock 909s : Other Stuff . . .
MTH is offline   Quote Quick Reply
Old 10-26-2011, 04:45 PM   #9
Jeeper
 
Join Date: Aug 2011
Location: Ohio
Posts: 1,251
I would go petrol. Before the knives come out, I've owned diesels. They are great for making big power, as in for towing. People who tow 15 or 18K, do so wiith diesels. You'll see the big 3, GM, Ford, Dodge.

In the old days, a simple mechanical pump pressurized inexpensive injectors, forcing the tip's nozzle to fire (at a relatively low pressure).

Since around 2000, emission requirements have forced engine mnfrs to move to a common rail design. It's a relatively simple operation to understand. Fuel is supplied by a lift pump which typically feeds a high pressure Bosch pump. It's output (5000 psi at idle and 20K+ psi at WOT) feeds a fuel rail (looks like a paper towel tube). This feeds high pressure precision metal fuel lines to electronically fired injectors. The injectors have solenoids that allow them to open and close up to 5 times per cycle
allowing precide fuel delivery.

Now the bad news.

Those injectors run about $500 per cylinder + installation. Water(in diesel fuel) ruins both them and the pump. Manufacturers won't cover water damage, so guess who might replace a fuel system in a 2 yr old car? You can add a water/fuel separator and better filtration, but most people don't. It's not easy to properly diagnose and fix a damaged injector. So shops want to replace the lot.

So what you gain in efficiency might well be paid for the diesel option, higher fuel costs (here in the US), and a 5K bill for fuel system replacement. Not saying they are bad, just pointing out there there is a liability there you don't have with a typical modern gasoline engine.
__________________
'14 Anvil JKUR (sold the '12 at 52K miles)
'13 unlimited stripped sport (red one)
'13 JKU sport (blue one)
'10 Unlimited sport (other red one)
'08 Unlimited X (green one)
3JKs1H1 is offline   Quote Quick Reply
Old 10-26-2011, 04:45 PM   #10
Jeeper
 
RedBones's Avatar
 
Join Date: Jul 2011
Location: Wv
Posts: 2,798
Diesel.
__________________
14 JK WW
11 JK
03 TJ
97 TJ
95 YJ
RedBones is offline   Quote Quick Reply
Old 10-26-2011, 04:46 PM   #11
Jeeper
 
JIMBOX's Avatar
 
Join Date: Nov 2009
Posts: 9,914
That does it !

When I get stationed in England, I'm ordering a Jeep /w the Diesel option --

No doubt in my mind !

JIMBO
__________________
"ya gotta have class"
JIMBOX is offline   Quote Quick Reply
Old 10-27-2011, 12:42 PM   #12
Jeeper
 
Osage Orange's Avatar
 
Join Date: Jun 2011
Location: Lewistown IL
Posts: 591
Demulsification and Lubricity of Diesel Fuel

Quote:
Originally Posted by 3JKs1H1 View Post
I would go petrol. Before the knives come out, I've owned diesels. They are great for making big power, as in for towing. People who tow 15 or 18K, do so wiith diesels. You'll see the big 3, GM, Ford, Dodge.

In the old days, a simple mechanical pump pressurized inexpensive injectors, forcing the tip's nozzle to fire (at a relatively low pressure).

Since around 2000, emission requirements have forced engine mnfrs to move to a common rail design. It's a relatively simple operation to understand. Fuel is supplied by a lift pump which typically feeds a high pressure Bosch pump. It's output (5000 psi at idle and 20K+ psi at WOT) feeds a fuel rail (looks like a paper towel tube). This feeds high pressure precision metal fuel lines to electronically fired injectors. The injectors have solenoids that allow them to open and close up to 5 times per cycle
allowing precide fuel delivery.

Now the bad news.

Those injectors run about $500 per cylinder + installation. Water(in diesel fuel) ruins both them and the pump. Manufacturers won't cover water damage, so guess who might replace a fuel system in a 2 yr old car? You can add a water/fuel separator and better filtration, but most people don't. It's not easy to properly diagnose and fix a damaged injector. So shops want to replace the lot.

So what you gain in efficiency might well be paid for the diesel option, higher fuel costs (here in the US), and a 5K bill for fuel system replacement. Not saying they are bad, just pointing out there there is a liability there you don't have with a typical modern gasoline engine.
The question would then be; Does the 2.8L CRD have a factory water separator?. Regardless, use a Stanadyne Lubricity Formula fuel additive so fuel is demulsified and water is better extracted from the fuel system. A lubricity formula keeps the fuel components lubricated, less wear. A Daimler-Chrysler separator pic used on a 2.8L CRD: Jeep Diesel Engine Swap Water Separator Photo 18
__________________

2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.
Osage Orange is offline   Quote Quick Reply
Old 10-27-2011, 01:28 PM   #13
Official WF thread de-railer
 
Mr. Sinister's Avatar
 
Join Date: Jul 2010
Location: Fair Hill, Maryland
Posts: 3,708
Quote:
Originally Posted by MTH View Post
That's 23 mpgs for us U.S. based folks. About 4 or 5 mpgs more than the stock 3.8 does on the highway.
I get 24 Highway with my 3.8 Automatic, calculated by hand, not the trip computer. I average 18mpg stop and go.

But yeah, it's still no diesel.
__________________
Bill
Mr. Sinister is offline   Quote Quick Reply
Old 10-27-2011, 09:02 PM   #14
Jeeper
 
Join Date: Aug 2011
Location: Mount Dora, FL
Posts: 185
diesel!!
h20squirter is offline   Quote Quick Reply
Old 10-27-2011, 10:45 PM   #15
Jeeper
 
Osage Orange's Avatar
 
Join Date: Jun 2011
Location: Lewistown IL
Posts: 591
Oh, I forgot to formally cast my vote. DIESEL!!!!
__________________

2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.
Osage Orange is offline   Quote Quick Reply
Old 10-29-2011, 12:38 AM   #16
Jeeper
 
Join Date: Dec 2010
Posts: 22
Quote:
Originally Posted by Raymond7905
I'm just about to buy my first Wrangler. Question I'm pondering is whether to buy the diesel 2.8L or 3.8L Petrol. Every person I've spoken to has another opinion.

Would appreciate some advise from experienced peeps?
Where are you from??

I'd say diesel
Aussie Jeeper is offline   Quote Quick Reply
Old 10-30-2011, 04:43 PM   #17
Jeeper
 
Bazzer's Avatar
 
Join Date: Oct 2010
Location: England
Posts: 275
Quote:
Originally Posted by Osage Orange

The question would then be; Does the 2.8L CRD have a factory water separator?. Regardless, use a Stanadyne Lubricity Formula fuel additive so fuel is demulsified and water is better extracted from the fuel system. A lubricity formula keeps the fuel components lubricated, less wear. A Daimler-Chrysler separator pic used on a 2.8L CRD: Jeep Diesel Engine Swap Water Separator Photo 18
It sure does. It's built into the diesel filter. I changed mine this weekend when I gave it a full service before winter arrives.
__________________
2008 JK Sahara Sport, Bright Silver Metallic 2.8 Diesel, 6 speed manual. 28mpg
Bazzer is offline   Quote Quick Reply
Old 10-30-2011, 04:46 PM   #18
Jeeper
 
XJ Knight's Avatar
 
Join Date: Oct 2010
Location: Walking The Plank
Posts: 16,640
Quote:
Originally Posted by Raymond7905 View Post
I'm just about to buy my first Wrangler. Question I'm pondering is whether to buy the diesel 2.8L or 3.8L Petrol. Every person I've spoken to has another opinion.

Would appreciate some advise from experienced peeps?
Diesel engine is better then the gas one

__________________
-XJ- 2001 Jeep XJ Cherokee - Gone
1999 Jeep XJ Cherokee - Party Hard


-InfernoGirl- "They are the most fun you can have with your pants on..."

"Selfless over Selfish" RIP Brian "96_XJ" Perrine
XJ Knight is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Petrol or Diesel? Adrian Stuart General Jeep Discussion 2 10-04-2011 03:37 PM
Diesel powered jeep... Hill-Billy General Jeep Discussion 2 07-22-2011 01:39 PM
Everyone who complains about the 3.8 not having enough power... Thracks JK General Discussion Forum 83 04-30-2011 08:40 AM
No diesel for Wrangler shenandoah JK General Discussion Forum 26 02-08-2010 10:59 AM
motor swap opinions (gas v diesel) 350chevrolet TJ General Discussion Forum 9 03-15-2009 09:26 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:47 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC