Diesel conversion or replace the 4.6? - Defender Source
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  #1  
Old February 6th, 2014, 11:35 PM
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Diesel conversion or replace the 4.6?

Trying to decide which route to take here. My 4.6 in my NAS 110 appears to be shot...oil dumped and coming out of the exhaust along with an unbelievable smoke screen. Looks like the easiest way out is to replace the 4.6, but wondering if i should go with a 200tdi or 300tdi conversion. Would the diesel have enough power for a loaded 110 with gear and roof top tent, etc.? I would still need heat and a/c. Would I be getting into a much deeper project doing a conversion? It looks like the diesel conversion would be a little more costly, but at 10mpg with the 4.6, would it be feasible to make up the cost difference in fuel consumption savings with the diesel?

I am looking at a re-manufactured 4.6 with a 3 year warranty vs a 200/300tdi with 90-100k miles and a 30 day warranty...and a little more money than the 4.6.

Has anyone gone from a 4.6 V8 to a 200/300tdi...or the other way around? Regrets? Praises? Advice?

Thanks,
Pete
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  #2  
Old February 6th, 2014, 11:41 PM
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Define... "enough" power. I drove an 06 300Tdi for several hours on a road trip, while it didn't have gobs of power at over 60 it was more than enough to make me smile.
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  #3  
Old February 6th, 2014, 11:51 PM
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I would say enough power to get me around 65-70 loaded and on the highway...I'm typically not in too big of a hurry in the 110. Also enough to climb some mountain roads like through Oklahoma/Arkansas.
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Old February 6th, 2014, 11:53 PM
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I would stick with the V8 personally.
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  #5  
Old February 6th, 2014, 11:55 PM
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There is also the OM617 conversion which is pretty much a bolt in from what I gather.
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  #6  
Old February 7th, 2014, 12:58 AM
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I think this is a bit of a no brainer..... stick an LS & six speed in it !
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  #7  
Old February 7th, 2014, 01:19 AM
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I think this is a bit of a no brainer..... stick an LS & six speed in it !
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  #8  
Old February 7th, 2014, 07:27 AM
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Since its an NAS 110, I would definitely keep the Rover V8. I'm no purist, but I think putting some other non Rover motor in it would devalue it in I'm opinion.
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Old February 7th, 2014, 07:29 AM
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You will likely never make up the consumption savings within your lifetime.
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  #10  
Old February 7th, 2014, 07:45 AM
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X3 re LS six speed. Find and drive 300 in a comparable truck with weight and take it to the mountains. On the trails the 200/300s are excellent. Hell, even the 2.5NAs are awesome. In my experience the 300's are fine at their respective highway speeds once you get there (60-70 comfortably); it's the painful process of getting there that's the problem. Clay
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  #11  
Old February 7th, 2014, 07:57 AM
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Can I ask who your source is for the re-manufactured 4.6 with a 3 year warranty?
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  #12  
Old February 7th, 2014, 07:59 AM
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I agree with Jimmy-rover v8.

While a NAS 90 isn't really a true collectible since there were thousands of them, the 110's are.

I have a heavy "tuned" 300 tdi 130 on 12.5x35's and it will run down the interstate @ 75mph but
its working hard and downshifts on grades are frequent due to the 2.5 liter displacement. Tdi's make decent power once tuned, and can be really fun once modified, but many are dogs in their stock tune. Stick with another 4.6. Atlantic British sells a short block or long block ready to go for reasonable money.
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  #13  
Old February 7th, 2014, 08:34 AM
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Quote:
Originally Posted by belgian View Post
Can I ask who your source is for the re-manufactured 4.6 with a 3 year warranty?
Great Plains Rovers in Oklahoma for the re-man 4.6...but I will check on the long block from Atlantic British.

The LS conversion sounds nice, probably not as "plug and play" friendly as going back with the 4.6 and concerned with having to do an auto conversion, electronics, etc...
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  #14  
Old February 7th, 2014, 09:39 AM
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Originally Posted by rijosho View Post
You will likely never make up the consumption savings within your lifetime.

I'm not so sure about that. The 4.6 is toast, so he'd only have to make up for the incremental cost of the TDI versus another 4.6. If you're driving it a lot, I don't think it's unrealistic to cover that cost in a few years.


That said, the NAS 110 is a rare truck and should be kept as it was intended. I like diesels so if this were me I'd put the new 4.6 in the NAS 110, sell it to a collector, and buy a ROW truck.
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  #15  
Old February 7th, 2014, 10:01 AM
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There are more factors in play here...
Are you keeping it or selling it?
The Rover V8s are not known for longevity.
If they were you wouldn't be having issues.
The Rover TDIs are Ok engines, but still have head and head gasket and timing belt maintenance, often at the worst time.

The OM617 is a million mile engine and am working on getting a high performance IP that will send it up to 160HP with about 220 lbft of torque, but this is only speculation at this juncture.
So you know which engine I prefer, but it's your vehicle and there are trade offs.

Is it a daily driver or a weekend camp trail vehicle?
Are you willing to move over in the truck lane going up a mountain?
Do you tow?

You might want a V8 and you might not.
The most simple solution is to put the same engine in it that you have now ie a 1 to 1 swap, but this is really an endless debate with a decision only you can make.

Sorry your current engine is giving up the ghost.
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  #16  
Old February 7th, 2014, 10:03 AM
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Yeah, I believe I calculated around 1,000 in fuel savings every 5,000 miles at 10mpg premium gas price vs 25mpg diesel fuel price...but kinda leaning towards the 4.6 for some of the reasons above...and easier/quicker change out to get it back on the road.
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  #17  
Old February 7th, 2014, 10:11 AM
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Quote:
Originally Posted by rijosho View Post
You will likely never make up the consumption savings within your lifetime.
I wonder if you include reduced maintenance costs ... how this would effect the calculation.
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  #18  
Old February 7th, 2014, 10:15 AM
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I wonder if you include reduced maintenance costs ... how this would effect the calculation.
Honestly, half of the fun of having a V8 is that it doesn't work 10% of the time. Are you really willing to give that up?

And yes I was somehow assuming that your 4.6 could be salvaged and that an engine swap wasn't necessary but just desired...in which case the diesel swap wouldn't be financially feasible from a gas consumption perspective.
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Old February 7th, 2014, 11:20 AM
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I would just stick with the 4.6 since it is a nas 110.

Keep it somewhat original.
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  #20  
Old February 7th, 2014, 11:28 AM
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Originally Posted by rijosho View Post
Honestly, half of the fun of having a V8 is that it doesn't work 10% of the time. Are you really willing to give that up?
Joshua: I better not say something like, 10% is on the high side, because we still have a Disco V8 that is running fine and don't want to jinx it. It is however slated for a 300TDI diesel conversion.

Our machine shop just completed 3 prototype adapters that allow the 300TDI to bolt directly to the Rover V8 transmission pattern. I want to make the custom mounts for the 300TDI with this adapter that will bolt directly to the Disco V8 frame mounts and use the big hydraulic filled Mercedes motor mounts to allow an easy low vibration swap from a V8 to a 300TDI, but won't get to this until this summer at the earliest as this is one of many many projects on the list.
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