XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

1983 XJS v12 to Cummins build

 
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Old 09-02-2017, 09:55 PM
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Ron, numbers are great, but what is the qualitative feel of such a beast? I've been in some pickup trucks that probably had something similar, and no F-ing way in hell would I swap those engines into my XJS. Must be an improvement over the original (of course purely subjective).

Now I know what a Mercedes twin turbo V12 can do, and that matches my perception of what an improved XJS engine should feel like.
 
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Old 09-03-2017, 07:54 AM
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Originally Posted by Flint Ironstag View Post
Ron, numbers are great, but what is the qualitative feel of such a beast? I've been in some pickup trucks that probably had something similar, and no F-ing way in hell would I swap those engines into my XJS. Must be an improvement over the original (of course purely subjective).

Now I know what a Mercedes twin turbo V12 can do, and that matches my perception of what an improved XJS engine should feel like.
I think it's more about daring to be different? I mean there's no reason not to, All it takes is time, money, and effort. If you have all three, why not??? I'm installing a 460 Ford V8 into my 89 XJS. Just for the fun of it. And because it's not a SBC!!! I mean C'mon my last name is SHELBY putting a SBC in it would be sacrilege!

89 Jacobra
 

Last edited by 89 Jacobra; 09-03-2017 at 07:58 AM.
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  #43  
Old 09-03-2017, 08:40 AM
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A 40t Volvo FH has 750 hp and 3550 nm (no lbft)... But it still isn't faster than a 45 hp Ford Fiesta MK II
 
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Old 09-03-2017, 07:22 PM
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daim, i think you meant 450HP ford!
 
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Old 09-03-2017, 07:43 PM
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something some may not be aware of with jaguar XJ/XJS is the whole rear cage.subframe is mounted with rubber mounts.
it was never designed for hard acceleration, it sqirmes on the rubber mounts,all over the place car cant stay straight, with enough power/tire grip it can be ripped out from under the car,,(ask how in know).

fact is, there was a video about Sir William Lyons and he made mention that design engineers had some concern about the rear drive assembly, not as proper as it should be , but time involved they left it as is!

some of the racer Jag guys have made many odd modifications(starting with Grp44 USA in 1977, XJS).

a pic of my add on cage mounts, they where fairly effective for a few years , then car was tail wagging ,and it got worse as time went on.

had to replace shocks and bushings, and both ends of Radius arm bushes ,it tore them up pretty bad!

i know some have mounted the cage solid to body NO rubber at all.

but ride suffers also!

anyway do what ever lights your fire , but be aware!
 
Attached Thumbnails 1983 XJS v12 to Cummins build-jag-under-shaft-trans-010.jpg   1983 XJS v12 to Cummins build-jag-under-shaft-trans-011.jpg  
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Old 09-03-2017, 07:53 PM
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Originally Posted by Flint Ironstag View Post
Ron, numbers are great, but what is the qualitative feel of such a beast? I've been in some pickup trucks that probably had something similar, and no F-ing way in hell would I swap those engines into my XJS. Must be an improvement over the original (of course purely subjective).

Now I know what a Mercedes twin turbo V12 can do, and that matches my perception of what an improved XJS engine should feel like.
.

FLINT, in todays world of hard acceleration, its all about all-wheel drive, at least for the 1st 100ft or more!
pic of a 2017 Nissan GTR-Nismo AWD, nothing can beat it off the line , and i guess top speed also!

dynod 1400wheel HP(thats one thousand four hundred HP, plus it goes around corners , and stops very quickly,
 
Attached Thumbnails 1983 XJS v12 to Cummins build-20170818_193228.jpg   1983 XJS v12 to Cummins build-20170818_193240.jpg  
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  #47  
Old 09-03-2017, 09:57 PM
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tried to get the motor running with a jury rig set up and the starter installed but it wouldnt rotate a full 360. tearing the bitch down to the head and gonna see whats up inside,, it was in a junk yard after all..
 
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Old 09-03-2017, 11:31 PM
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You might try pulling the Injectors and squirting some ATF or similar thin creeping type oil and see if you can't roll it 360, could be some liquid on the piston and with about 18 or 19 to 1 compression ratio. Any liquid will lock it solid. pulling the injectors could also tell you which cylinder is causing the trouble.
 
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Old 09-04-2017, 07:59 AM
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Nobody's telling me what this Cummins engine is like. Anyone?

- smooth idle (I can balance a coin on my XJS, even while starting sometimes)?
- pleasing exhaust note?
- what's the torque curve like?
- how does power delivery match the transmission?
- on the highway?

I'm not about building a drag racer. There was a fellow named Martin ***** who hot rodded an XJS - as I recall he grenaded a couple of transmissions and rear subframes - I have heard that they need reinforcement when boosting HP.

Hmmm... probably time to start looking for flooded CL600s and XJS shells in Houston.
 
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Old 09-04-2017, 11:52 AM
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Well to put it mildly! It's a beast compared to the V12 it is replacing. It's a Truck Motor! It idles decent for a truck, It has torque like a truck, It sounds like a truck, that being said. It will be very interesting to see how it all works. As It probably has about 200Hp but 700 to 800 ft lbs of torque stock. It all depends on the way it was set up, Cummins produces many different Hp and Torque variations. So the chassis handling the torque could be a real issue. Once again you have to address the issues as you come to them. Kind of like you fix the weak link in the chain, and then go find the next weak link. As far as this engine goes it is a reasonably smooth performer and produces torque in a fairly smooth even curve, but still far above what the "Kitty" is used to! So all I can say to him is GOOD LUCK!!!
 

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Old 09-04-2017, 02:27 PM
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to get some idea od what diesels can do in a car?

you tube .com look up Duramax Camaro, and Cummins Charger.
 
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Old 09-04-2017, 08:31 PM
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I was just sitting here reading through the posts, and realized a funny saying comes to mind. Pud is trying to "PET THE CAT BACKWARDS". Usually all this accomplishes, is ruffled fur and a "PISSED OFF CAT" !!!
 
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Old 09-04-2017, 11:37 PM
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[QUOTE=89 Jacobra;1753642... It's a Truck Motor! It idles decent for a truck, It has torque like a truck, It sounds like a truck[/QUOTE]
Not in MY XJS. I really wonder what some of you guys are smoking when there are so many better alternatives out there.

But hey, I absolutely celebrate the fact that we're all free to pursue our individual ideas of perfection. Think I'm off to start a new thread...

Keep posting progress and pics, I'm enjoying this thread!

Cheers
 
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Old 09-04-2017, 11:41 PM
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Originally Posted by Flint Ironstag View Post
Nobody's telling me what this Cummins engine is like. Anyone?

- smooth idle (I can balance a coin on my XJS, even while starting sometimes)?
- pleasing exhaust note?
- what's the torque curve like?
- how does power delivery match the transmission?
- on the highway?

I'm not about building a drag racer. There was a fellow named Martin ***** who hot rodded an XJS - as I recall he grenaded a couple of transmissions and rear subframes - I have heard that they need reinforcement when boosting HP.

Hmmm... probably time to start looking for flooded CL600s and XJS shells in Houston.
it'll idle like a tank but not smooth at all.
i love turbo whistle so yeah pleasing exhaust for me
torque curve is max torque at 1300 rpm.. spins up to 3200
it'll get better mpg (up to 28 highway) and power is all grunt up to redline from really down low.

Good idea on pulling the injectors! im going to do a head gasket tho anyway

this motor stock is rated at 160hp 400tq but im looking at pushing 400/800 respectively
 
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Old 09-05-2017, 10:28 PM
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Is this an older Mechanical pumped engine? I haven't been able to see the drivers side of it to tell for sure. What year is it? If it is electronic it can be turned up some with a lap top, usually about 100hp. is available before real performance mods have to begin, cams, turbo etc. The turbo is probably the biggest performance gain for the 5.9.
 
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Old 09-06-2017, 11:20 AM
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its most likly a Bosch P pump, mechacnical.

diesel engine are very simple to make torque!

add more air,big turbos, then add fuel according to the engines integrity limits!

simple as that, yeah you can add other small tweiks, but nothing beats fuel and air.

the drawback is diesel make the most torque when its pure black smokin,(roll-in-coal).

term goes back 150yrs with train locomotives, big diesel ships.

as soon as you can get some more air into the chamber(boost) ,the smoke goes away, cruisin!!

i owned a company on Daytona for 30yrs, called "Performance Diesels", i retired as race diesels just becoming popular!
 
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Old 09-06-2017, 07:09 PM
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I never did much on the performance side of diesels. I worked for a Freightliner dealer for almost 10 years. I did several "block swaps" as Cummins had a problem with porus engine blocks, and coolant would seep right through the side of the block itself. Now I'm Transportation Director for my local school and for the last 10 years have done more maintenance then rebuilds. The 5.9 Cummins is a great little engine , For A Truck! LOL!!!
 
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  #58  
Old 09-07-2017, 10:56 PM
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The engine is powered by a ve pump. 1st gen cummins.

Doing the head because it wouldnt turn over with the starter.. found rust in cyl. 4. managed to fix it up and now it spins beautifully.

so happy. head gasket coming in the mail tomorrow or saturday



















 
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Old 09-07-2017, 10:57 PM
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the engine is in such good shape too. it must've honestly had under 50k in the junk yard. i was worried but after opening it it still has the factory cylinder hone going on.. or someone did a primo rebuild
 
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Old 09-08-2017, 01:04 AM
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Originally Posted by ronbros View Post
daim, i think you meant 450HP ford!
No, a 45hp (1.1l down draft carb Kent 4 cylinder).
 

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