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Old 05-15-2011, 06:49 PM   #1 (permalink)
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Diesel Modification

I seen a couple posts regarding this topic, therefore thought I would ask for help.

I drive a Jaguar S-type, and changed my driving habits to those recommended on this site. I have gone from 19.5MPG to 27MPG > thank you.

Anyway, I drive about 50K miles per year, therefore would love to drive something a bit more economical, though not a fan of anything produced on the market with 40+MPG.

Therefore, I would like to swap a diesel into my 1990 XJ40 (straight 6, 4.0litre)

I have heard, and seen some old jaguar's converted with a Nissan 2.2...

Any suggestions before I start, regarding the easiest, no pun intended, swap?

Would tracking down a nissan 2.2 be the best route?
Jetta TDI engines are readily available here - might this 1.9 turbo make a good choice?

My cousin is into hot rodding and fabbing, so I will have him at my disposal.

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Old 05-15-2011, 07:11 PM   #2 (permalink)
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I'll throw a different spin on this; call Jaguar conversions, swaps, parts, service and advice - from John's Cars in Dallas. and look into a small block kit; then instead of the Nissan motor, get a 6.2 / 6.5 GM and swap it in. This engine bolts to wherever a small block GM can fit.

If you do a search here, there's a gentleman that swapped one of these into a Corvette. He's doing 40 mpg.

These engines can be bought for no money, they're easy to fix and better match for that heavy Jag. Between Heath Diesel and Kennedy Diesel there's enough expertise to make these engines run very well.
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Old 05-15-2011, 07:36 PM   #3 (permalink)
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cleenspeed - thanks for the quick response.

I believe i know of the conversions you speak of (brunswick perhaps; comes to mind).

I did not think it would yield results like such (in regards to MPG) I will do some research and take a look at your link.

Many thanks!
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Old 05-15-2011, 07:48 PM   #4 (permalink)
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The 6.2/6.5 is a lot better than most people think.
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Old 05-15-2011, 08:51 PM   #5 (permalink)
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The 6.2 is capable of at least high 20's city and 30's highway. A suburban can get 30's with one, I'm sure your jag can do it...

Also, a 3.0 5cyl merc turbo might get you somewhere. Someone here put one in aSuburban and got +30 with that arrangement.
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Old 05-15-2011, 08:55 PM   #6 (permalink)
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For you, the AHU (1.9 TDI) is much more readily available. Not easy to come by in the US. Given that, it may be prudent for you to use one. That will pretty much guarantee 40+, 50+ with good driver skill.
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Old 05-16-2011, 09:11 PM   #7 (permalink)
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The 1.9 alh is the way to go.
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Old 05-17-2011, 10:31 AM   #8 (permalink)
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a 1.9 is no match for the chassis weight of the Jag. It weighs in at 3979 pounds.
That would be a frightening drive in any trying condition, a merge, etc.
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Old 05-17-2011, 10:38 AM   #9 (permalink)
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How much of the JAG's weight is engine/accessories?

I'd be willing to bet that its a fair amount, and given that the 1st gen Ford explorer was questionably safe to operate in daily life, and is seriously under powered (relative to similar cars) with it's 6 cylinder, and weighs some 4k lbs, the JAG with a 1.9 turbo diesel would be finely capable.
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Old 05-17-2011, 10:51 AM   #10 (permalink)
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The XJ40 chassis has an all aluminum engine that is way lighter than the 4.2 from the previous generation XJ's.

What about the BMW 2.4L inline 6 turbodiesel?

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