4.8 diesel conversion

Submitted: Saturday, Oct 13, 2012 at 11:44
ThreadID: 98519 Views:3859 Replies:11 FollowUps:12
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gday i have a 2003 4.8 patrol auto and was wandering if anyone knows much about converting the 4.8 to diesel or fitiing a 4.2 turbo diesel.
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Reply By: Bonz (Vic) - Saturday, Oct 13, 2012 at 12:02

Saturday, Oct 13, 2012 at 12:02
Why dont you turbo the 4.8? There are a few on the competition circuit and they are an awesome unit.
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Follow Up By: Trev&Ness B - Saturday, Oct 13, 2012 at 12:16

Saturday, Oct 13, 2012 at 12:16
im looking to do it more for towing and fuel economy.
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Follow Up By: Bonz (Vic) - Saturday, Oct 13, 2012 at 12:23

Saturday, Oct 13, 2012 at 12:23
ahhh cool, gas may also be an option
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Follow Up By: Trev&Ness B - Saturday, Oct 13, 2012 at 12:26

Saturday, Oct 13, 2012 at 12:26
thought of that but you use 2x amount of gas when towing and the price off gas isnt half anymore, so i wouldnt be gaining anything.
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Follow Up By: Road Warrior - Saturday, Oct 13, 2012 at 20:42

Saturday, Oct 13, 2012 at 20:42
A bloke up the corner from me had a turbo'd 4.8 Patrol running on straight LPG (liquid injection too). It was a bit of an animal, could hearing coming from miles off.

Also, do a search on YouTube for "Patrol versus Lamborghini"
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Reply By: Ross M - Saturday, Oct 13, 2012 at 13:23

Saturday, Oct 13, 2012 at 13:23
G'day Trev
You CANNOT convert the petrol engine to diesel Totally different operating situation.
To change the engine to a 4.2 diesel it will require a lot of extra bits and pieces and installation of the diesel control systems to do the conversion. Many items involved.
Unless you are going to do that yourself I would imagine it would be cheaper to trade to a diesel engined vehicle.
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Follow Up By: Trev&Ness B - Saturday, Oct 13, 2012 at 13:47

Saturday, Oct 13, 2012 at 13:47
I realise they are 2 different engines and run completely different , im looking into options at the moment, my car has only done 125k kms so to trade in on a 4.2td i would be getting one that has done 300+ kms and still have to put in $10000+. I know all the running gear etc is in top condition in my car and a 4.2td in auto would be awesome, seems as they dont make them.
Those 6.5 brunswick diesels are old recon pet motors changed to run on diesel so thats why i was thinking i mite be able to do something simalar with mine.
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Follow Up By: Rosss - Saturday, Oct 13, 2012 at 13:58

Saturday, Oct 13, 2012 at 13:58
Please tell me how you convert a petrol engine to run on diesel
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Follow Up By: Trev&Ness B - Saturday, Oct 13, 2012 at 16:38

Saturday, Oct 13, 2012 at 16:38
it is basically a total rebuild from the ground up.changing everthing just about.
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Follow Up By: Dennis Ellery - Saturday, Oct 13, 2012 at 18:44

Saturday, Oct 13, 2012 at 18:44
Hi Trev.
Some one's tugging your chain mate– you can’t make a petrol motor into a diesel.
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Follow Up By: Member - Bruce C (NSW) - Saturday, Oct 13, 2012 at 19:22

Saturday, Oct 13, 2012 at 19:22
Hi Dennis,
The grey fergy tractor was built on a vanguard motor which they also turned into a diesel version.

They removed the distributor and fitted an injector pump in its place and fitted a head suitable for compression ignition to up the compression ratio. I cannot remember if the injectors went into the spark plug positions or not.

Converting petrol motors to diesel has been done but it is not a simple process I imagine.

Cheers, Bruce.
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Follow Up By: Dennis Ellery - Sunday, Oct 14, 2012 at 00:23

Sunday, Oct 14, 2012 at 00:23
The block and crankshaft may have been from the same castings but most of the other components wouldn’t have been interchangeable. Suitable for a production line – a pipe dream in an aftermarket situation – get real!
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Reply By: member - mazcan - Saturday, Oct 13, 2012 at 13:49

Saturday, Oct 13, 2012 at 13:49
hi trev&ness
i suggest you contact brunswick diesels
if its at all possoble or not he would know just google it and the brunswick site will pop up
cheers
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Reply By: Ozhumvee - Saturday, Oct 13, 2012 at 14:13

Saturday, Oct 13, 2012 at 14:13
WHY???
The extra money spent on petrol for the 4.8 over a diesel would be far less than the cost of swapping the engine plus the 4.8 has more power and would generally be nicer to drive especially if auto. Paying attention to keeping the engine in a correct state of tune and possibly amending driving style will give a small saving on fuel costs.
If you have your heart set on a diesel then swap the whole vehicle rather than doing an engine swap, far less grief and cost.
Peter
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Follow Up By: Member - Walter H (WA) - Saturday, Oct 13, 2012 at 15:24

Saturday, Oct 13, 2012 at 15:24
I had Brunswick diesel quote to covert my 4.8 petrol GU to the V8 diesel option but with a price of $27000 but it just wasnt a viable option,so and i just changed 4bys and that was 4 yrs ago so who knows what the cost would be now....as for converting a petrol motor to run on diesel...hmmm
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Follow Up By: madfisher - Saturday, Oct 13, 2012 at 18:05

Saturday, Oct 13, 2012 at 18:05
The diff in fuel economy between a modern petrol and a Diesel is less then 20% so if you spend $10000 a year on fuel currently, and you save 20% thats a saving off $2000, but then you have to deduct more expensive serving so we take off $500 leaving a net saving of $1500. Even if you get out of it for $22500 thats 15 years to break even piont. But if you are still keen do a a search on this site for project Toni. Colin replaced his 3lt grenade motor with a 6 clylinder toyota turbo diesel and this unit is still going great guns years later.
Cheers Pete
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Reply By: Member - Bruce C (NSW) - Saturday, Oct 13, 2012 at 19:14

Saturday, Oct 13, 2012 at 19:14
Hi Trev&Ness,

Before you spend a peny on conversions or updating I would find a diesel of the type you are contemplating and take it for a test run.

The only benefit would be fuel consumption in my opinion and you may be very dissapointed with the diesel performance compared with the 4.8 petrol.

There are some members on here who have 4.8 patrols and are so happy with them that they would not consider diesel Patrols.

Look hard before you leap, otherwise you may be regretting for a long time and be poorer for the experience.

I had a turbo diesel and have gone back to a 4.7 petrol and I am far more satisfied with it than I was with the turbo multi valve diesel Cruiser so I am speaking from personal experience.

Cheers, Bruce.
At home and at ease on a track that I know not and
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Reply By: TerraFirma - Saturday, Oct 13, 2012 at 20:20

Saturday, Oct 13, 2012 at 20:20
It's a quick way to burn a small fortune. Sell the car and buy a diesel. It's not hard and it's the only solution. When it comes to lots of towing diesel wins everytime. Sorry if I am stating the obvious and telling you what you don't want to hear but it's the only clear course.
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Reply By: howesy - Sunday, Oct 14, 2012 at 00:02

Sunday, Oct 14, 2012 at 00:02
For towing and economy supercharged injected LPG is unbeatable,,, low down torque avail. instantly from low revs with no lag and LPG economy. do the research.
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Reply By: Life Member - Doug T (NT) - Sunday, Oct 14, 2012 at 06:46

Sunday, Oct 14, 2012 at 06:46
Contact member On Patrol & Toni, he has a turbo'ed LC Engine fitted to his Patrol.
Look in the Blog section for his blog/report .

I have seen this conversion when he was at Mt Bundy, beautifully done.

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Reply By: Member - Bucky - Sunday, Oct 14, 2012 at 09:51

Sunday, Oct 14, 2012 at 09:51
Go to this mob !

Click here..... the ultimate tow vehicle !


I missed out on one by 2 weeks, and I knew the vehicle well :(

Cheers
Bucky

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Reply By: Grizzle - Monday, Oct 15, 2012 at 13:29

Monday, Oct 15, 2012 at 13:29
I will try to help with the question rather than spouting my own opinions. Go to the patrol forum www.patrol4x4.com and check there. Ther is a wealth of information on all sorts of conversions and I'm sure someone there will help rather than prattling on!

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Reply By: Robin Miller - Monday, Oct 15, 2012 at 18:50

Monday, Oct 15, 2012 at 18:50
Can't be done in any reasonable way Tess , and no benefits either - you actually get
less towing performance etc.

It isn't just the engine either , the auto has to be mated to the 4.8 ECU and you can't
even get an aftermarket ECU to match the auto to anything else.

The tailshafts , gearing, multiple body sensors etc are all different.

One of our familys 4.8s is on gas and while I personnaly wouldn't do this it does
lower the weekly fuel bill significantly.

The 4.8 already has a lot more torque than the diesels and the addition of gas
makes them even better at the cost of top end power.
Robin Miller

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