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Topic Review (Newest First)
10-30-2011 03:46 PM
XJ Knight
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
10-30-2011 03:43 PM
Bazzer
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.
10-28-2011 11:38 PM
Aussie Jeeper
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
10-27-2011 09:45 PM
Osage Orange Oh, I forgot to formally cast my vote. DIESEL!!!!
10-27-2011 08:02 PM
h20squirter diesel!!
10-27-2011 12:28 PM
Mr. Sinister
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.
10-27-2011 11:42 AM
Osage Orange
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
10-26-2011 03:46 PM
JIMBOX That does it !

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

No doubt in my mind !

JIMBO
10-26-2011 03:45 PM
RedBones Diesel.
10-26-2011 03:45 PM
3JKs1H1 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.
10-26-2011 03:38 PM
MTH
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.
10-26-2011 03:25 PM
Bazzer 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.
10-26-2011 03:17 PM
daggo66 That settles it. No J8 for me!
10-26-2011 03:14 PM
MTH 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.
10-26-2011 01:54 PM
rivershark2005 I would give almost anything to have that choice to make.

The diesel would be my choice.
10-26-2011 01:53 PM
kjeeper10 The choice
10-26-2011 01:52 PM
3JKs1H1 Buy the illusive diesel.
10-26-2011 01:49 PM
Raymond7905
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?

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