Has anyone tried putting a XJ8 4.0L engine
into a 1994 XJS 2+2 ?
I was curious once I saw that the 1994 XJS
used the ZF transmission and figured it would be
an interesting match for the XJ8 *(X308) engine.

I know, I know, this is a possible bad idea what with the
XJ8 4.0L having problems with the cylinder sleeves (NikaSil ?).
But, if I were to LUMP a XJS, I'd like to keep it as much Jag as possible.
Eh?
P O R - Press On Regardless

 

My thoughts are that if you are going there, why not the XJR, XKR engine?

 

Took the words out of my mouth, Super. Of course, the s/c version would be phenomenal in terms of making the beloved XJS a mighty muscle example in a most beautiful body style....but...I also happen to own an XJR and l know how quickly all that fun can come to a screeching halt with the electronic controls issues. Still, though (and placing the s/c V8 risks aside) just the thought of a s/c V8 Jaguar engine in there is an intoxicating one. Owning both (an XJS and an XJR), I'm fully aware of the potential magic that this awesome combo project could create, stuff of dreams, really. Besides, being a Jag engine, I'd say the word lump must not be used. However, and considering the complexity of the V8's electrical interfacing with just about everything in there, this is, really, a challenging project, but it has been done with E-Types that I know of, so the XJS would be as feasible I'd suppose.

Cheers,

 

No so much that, the biggest headache I see is engineering a swap that to my knowledge has not been done yet. Just aligning the engine so it sits correctly will be a PITA.

Why not a supercharged AJ16 engine, engine mounts should be the same as the AJ6 and if you get it with the trans 4L80e should fit with minimal fuss.

Or fir AJ6 and turbocharge it even easier

 

Because the AJ16 and the AJV8 are like apples and oranges. Scarbro's proposal was probably not to "fix" any existing situation, but more for the awesome potential results that the experiment could bring. The difference between my XJR's acceleration and that of my XJS is abysmal and it was the reason why my XJS now features an awesome nitrous injection system, pretty much matching the XJR's 5.2 sec 0 to 60.

Cheers,

 

Similar to Forcedair, I have an 02 XJR and a 95 XJS 4.0. I love both cars equally but the difference in performance feels like the cars were made by different manufacturers entirely. The XJR is a rocket and the XJS is nothing special acceleration-wise. But that's the only thing about the XJS that isn't special. Otherwise, it's a fabulous car.

 

Put the Jag V-8 engine in a 3,000 lb car would be fine but in a 4,000 lb XJS would bring it up only to a Mustang V-6 acceleration wise. Too much complexity to be worth it unless the aim is simply to have an XJS with a V-8.
IMHO, of course. RagJag.

 

Not so, the 308sc weighs a couple of hundred pounds more than an XJS and manages 0-60 in 5.6 seconds so the lighter XJS should be even quicker.

 

Having owned a 2001 XJR, as well as a 2004 XJR, I can also say that the performance of both cars was truly impressive for such heavy cars.

 

HEY my 1978 XJS roadster weighs in at 3365 lbs, on a calibrated scale!

i must say a supercharged V8 would be awesome, and then a little tweaking for air inlet and a large exhaust system,along with a reprogram of computer!! LOL.

 

Why reprogram a computer? But the Emerald, or the Electromotive and be done with it, lol

 

.

good idea, but i'm more familier with the SDS EFI system, what i have in my XJS V12! been 21yrs , and upgraded 3 times, as knowledge about EFI progresses.
fully adjustable from startup to 9000 rpm.

 

Absolutely not so. First, it's not just a V8, but a 370 HP supercharged V8. Second, the XJR already is close to 4000lb and it goes 0 to 60 in just 5.2 sec. Comparing the XJR's phenomenal acceleration to that of a...what? A V6 Mustang? Is no less than an insult.

Even a n/a Jag V8 would make the XJS much quicker with its 290 HP compared to the AJ6 (219HP) or the AJ16 (237HP). I personaly remember my previous '98 XJ8 acceleration being so much quicker than that of my XJS with both cars nearing the 4000lb. No doubt that even the n/a V8 would improve the XJS acceleration by quite a margin, but if one has the choice of using the s/c version instead, well, that would probably make an XJS one of the very best GT cars in history.

Cheers,

 

Would the XJ8 engine mount up to the 94 - 96 ZF transmission with no
adapter plates? Or would taking the complete engine-trany be the
best way for a swap?
I can't believe someone somewhere hasn't done this yet!
After reading about all of the Chevy Lumps done over the years
I would expect a natural swap of a Jaguar V8 4.xL engine to a XJS had been
attempted. Maybe one of the racing teams had such a project in mind?

And yes there would be some computer to engine wiring harness issues.
No pain - No gain, eh?

P O R - Press On Regardless

 

It has been done with the AJ16 6 pot engine and if I had the money I would buy it.
1996 XJS Celebration Coupe SUPERCHARGED., £ 15,000.00 - The site to buy and sell a jaguar car, parts or related services. Brought to you by the Jaguar Enthusiasts Club

 

I fear that with the XJS brand on the verge of attaining the same classic status
as the "E" type, there will be a reluctance to change any remaining units.

But, the "E" type has had some interesting mods to it's power plants and transmissions. So, maybe the interest will lead to some nice mods.

P O R - Press On Regardless

 

This is the way I would head, much easier than engineering a AJV8 swap.

Or you go AJ6 turbo, Arden managed 245kw (333hp) and 580nm from a turbo AJ6 on 0.65bar (9.7psi)

 

Of course that the s/c AJ16 is the other highly preferred option. It is just about equivalent in power to the n/a AJV8 engine, but obviously more at home in the XJS, although power wise still trailing the s/c AJV8 by a good 60 HP, which is equivalent to about 5 sec faster 0 to 60.

I have many times expressed in this forum my disappointment with Jaguar for not having dropped the s/c AJ16 power plant on the beloved XJS. It would've ended the XJS production with one heck of an exclamation point and probably placed the range's prestige pretty close up there with that of the E-Type once and for all. What a car that would've been, yet, when the opportunity presents itself with a supercharged XJS, the supposed enthusiasts on the subject are nowhere to be found. About a year ago, there were two s/c AJ16 XJS for sale on
eBay, both convertibles, both from the same owner and at a very fair price for what they were, yet they were there forever and they only sold after dropping the price significantly. Are we XJS owners true enthusiasts, or are we just too soft in the performance aggressiveness category? But don't look at me because my kitty does 0 to 60 in 5.2 seconds...

Cheers,

 

.

GM produced 91 million small block chevy engines, so cost/prices are super cheap, i have seen junkyards selling them for as little as $50. each, as many as you wanted, piled high as 20 Feet.

that is why a lot ended up in low value vehicles!

now XK8 engines would be much more costly, and need harness and computer, completely different animal.

but my dream is totally over the top, an Audi V12 DIESEL,comes factory twin turbos,twin intercoolers, direct injection, weighs close to same as Jag V12.

factory specs , 500hp ,torque 650lbs ft, , reprogram computor, 650-700hp ,800-850 torque, dont even have to take the engine apart, whats there not to like?
cost WOW, dont ask, a lot.

 

Your dream as the annoying ads and I too dreaming; )