Diesel Modification

[Rusty Marina]

Why not a Cummins BT 3.9 4 cylinder ?
They make plenty of low end torque, which would be needed for a heavy luxury car.
The rockcrawlers must like them for their low end torque because they're popular in Jeeps

[cleanspeed1]

It's a very strong, capable, modifiable engine, BUT, an unrefined beast.

It's not something you want in a Jaguar. No balance shafts make it a big vibrator, and the noise will get to you after a while. Not to mention when people see a beautiful sedan roll up sounding like a Massey Ferguson tractor.

At least the TDI is pretty quiet even after you add power to it.

Hey, how about the VAG/Volvo IDI inline 6 turbodiesel out of an old 740? Nothing but the VW IDI with 2 more cylinders.

[G60ING]

I wonder how tall of an engine can fit in there. A TDI swap is possible but there would be a good deal of fabrication and then there would be a good deal of electrical work too.

[larrybuck]

I like the 6.2 choice. It will be relatively cheap to purchase, also low upkeep, and low tech enough to bravely face what unfortunately will be a economic dismal future!

[fud2468]

Guys, where do you find these GM diesels? And then, aren't they IDI and smokers designed for high-sulfur fuel?
Ray Mac.

[cleanspeed1]

Originally Posted by fud2468

Guys, where do you find these GM diesels? And then, aren't they IDI and smokers designed for high-sulfur fuel?
Ray Mac.

You can find them anywhere, just do a search. They don't smoke unless the pump and injectors are worn out and they can handle low sulfur fuel. If there is a question about lubricity, add some treatment to the fuel.

GM made tons of these engines for almost 30 years and there isn't a great demand for them.

[Arragonis]

I would suggest some of the larger Audi units, the 2.5 S5 or V6 ?

[320touring]

Originally Posted by Arragonis

I would suggest some of the larger Audi units, the 2.5 S5 or V6 ?

I'd second that, mainly because Audi longitudinally mount all their engines, even in the FWD models.

That means the mounts are the right way for a Jag..

Plus the power from the 2.5 v6 is suited to wafting A6 sized cars along- not too far off the Jag

[Christ]

Originally Posted by 320touring

That means the mounts are the right way for a Jag..

Which, in reality, means nothing. He'll have to custom mount anything he puts in anyway.

Every mention of a 2.5 I'm seeing from Audi is showing either around 120hp, or around 300+hp. I imagine the latter being a newer gasser engine.

Point is: it's going to be heavier than the VW engine, have similar power, and is still made by VAG. It'll likely be more expensive, as well. AUDI is one of the Executive class labels in the world.

[Arragonis]

Originally Posted by Christ

Which, in reality, means nothing. He'll have to custom mount anything he puts in anyway.

Every mention of a 2.5 I'm seeing from Audi is showing either around 120hp, or around 300+hp. I imagine the latter being a newer gasser engine.

Point is: it's going to be heavier than the VW engine, have similar power, and is still made by VAG. It'll likely be more expensive, as well. AUDI is one of the Executive class labels in the world.

The bits in those are shared with quite a few VWs including Golfs and Jettas / Boras. Mounting a 1.9 TDI longways can be done if you get the bits from an Audi A4/A6 or from a VW Passat as they are mounted the same way.

Not easy mind but no engine swap is.

As 320 tapped there are versions of the Audi A6 which weighs probably the same as an XJ40 with TDis as small as the 1.9 with 110hp and they are not too shappy in terms of 'go' either.

Audi made a few 2.5 Diesels from 140hp (S5) to the V6 Twin Turbo at 180hp. There is a single turbo at 150hp I think as well. The S5 also made it into some Volvos - the 850 and V70/'new' V70 of 1999.

The Jaguar XF is about to be fitted with a new 2.2 4-pot Diesel with 188hp/300lb/ft and 53 MPG.

The XF weighs a lot more than an old XJ40 especially if the latter as had the "lightness by oxidation" facility built into older British cars at the factory

Combining the two concepts, you could get a 1.9 TDi PD to make 170+hp / 280+lb/ft without huge difficulty or expense depending on your starting point, but ultimately this may not be as cheap as dragging out a truck engine and fitting that - which seems a shame as the extra capacity is not really needed with all those 4 pot TDIs around.

Still it may be whatever is available locally for the right money. Getting a suitable gearbox and rear end to match the lower revving Diesel may be more of a challenge than the engine choice alone.