speedyxjs
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| posted on 10/1/08 at 04:07 PM |
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Jag V12
Im waiting to hear from a fairly local bloke on ebay selling a Jag V12. I have asked him for the dimensions to confirm it would fit my lengthened and
widened chassis. The engine is from an 85 xjs. If it is the right size should i go for it or pass SVA with my 2.9 and upgrade post SVA?
How long can i resist the temptation to drop a V8 in?
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big_wasa
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| posted on 10/1/08 at 04:10 PM |
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if you have to have a V12 7 you may aswell start with it and do the job once.
good look with the pluming 
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speedyxjs
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| posted on 10/1/08 at 04:16 PM |
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quote:
Originally posted by big_wasa
if you have to have a V12 7 you may aswell start with it and do the job once.
good look with the pluming
i dont have to, i just figured iv gone to all the trouble to have a bigger engine bay, i may aswell make use of it.
I haven't decided yet, i could use a supercharged Jag V8 now that i know a V would fit.
How long can i resist the temptation to drop a V8 in?
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pewe
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| posted on 10/1/08 at 04:18 PM |
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Call me a kill-joy but I think you'd be better off with your V6.
My gut feel is that though the V12 will sound awesome it'll be heaps of trouble to fit and run - but hey whatever turns you on!
Cheers, Pewe 
Supercharged V8 - now you're talking
[Edited on 10/1/08 by pewe]
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speedyxjs
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| posted on 10/1/08 at 04:29 PM |
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The only thing is that the supercharged V8 i could get 500 horses out of (but not very locost), with the 12, for the same money i could get around
700. The V8 weighs about 220 kg and the 12 is around 300.
How long can i resist the temptation to drop a V8 in?
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Benzine
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| posted on 10/1/08 at 04:33 PM |
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do it for the lulz
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Gergely
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| posted on 10/1/08 at 04:42 PM |
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700 bhp in a seven
I hope you have good insurance...
Go for it if you can, then post lots of pics and videos!
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pewe
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| posted on 10/1/08 at 04:51 PM |
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Presumably the supercharged engine will give more bottom end grunt - on second thoughts bet you wouldn't tell the difference when your brain is
fogged out with all the tyre smoke.
Better get a job with a tyre company!
Cheers, Pewe
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Danozeman
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| posted on 10/1/08 at 04:53 PM |
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Go for it straight away man. There no point in doing the work twice.
IMO I think it would be extreme overkill with a V12 in respect of power size and actually using the power BUT it will be very different and hell of
a beast. Id go for it!!!!
Just like matey on here with the viper engined viento Utter madness!! But great!!
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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big_wasa
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| posted on 10/1/08 at 05:05 PM |
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Seeing the v10 7 at Newark made my day.
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Fozzie
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| posted on 10/1/08 at 05:39 PM |
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May I ask.... ......
by how much and how long have you lengthened and strengthened the chassis and tranny tunnel?
Ta
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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Mr Whippy
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| posted on 10/1/08 at 05:41 PM |
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that v12 is colossal, I'm always seeing them in scrap cars and no one ever touches them, cos what on earth does it fit in? I have no doubt
their good engines but very very heavy and thirsty.
Fame is when your old car is plastered all over the internet
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zilspeed
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| posted on 10/1/08 at 06:21 PM |
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V12 in a seven must mean low speed understeer. Which is not really the thing, is it ?
It's got to stick like a limpet.
Then there's the power and torque to contend with.
I would be willing to bet that over a twisty course, a well driven xflow powered car would absolutely spank it.
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Confused but excited.
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| posted on 10/1/08 at 07:08 PM |
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If you have upgraded the chassis to 50x50x3mm fair enough.
I would think the V12 in a 'seven' could give you a chassis somewhat pretzelish.
Oh, the bragging rights though!
Tell them about the bent treacle edges!
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speedyxjs
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| posted on 10/1/08 at 07:13 PM |
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quote:
Originally posted by Fozzie
May I ask..........
by how much and how long have you lengthened and strengthened the chassis and tranny tunnel?
Ta
Fozzie
Iv lengthened and widened the bay by 6" and there will be a little more triangulation going on.
How long can i resist the temptation to drop a V8 in?
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speedyxjs
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| posted on 10/1/08 at 07:15 PM |
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Oh and the steel is 2 or 3mm thick (cant remember but think it may be 3)
How long can i resist the temptation to drop a V8 in?
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NS Dev
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| posted on 10/1/08 at 07:16 PM |
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300 Kg engine
My whole car is only 560kg and that is with, as the bike engine boys would say, a heavy Vauxhall 16v engine (110kg sh)
The Jag gearbox is around 100kg as well isn't it??
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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iank
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| posted on 10/1/08 at 07:26 PM |
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The other problems will be 1. the size of the fuel tank required, 2. the recommended carburation system is a bucket brigade with the guy at the front
standing astride the engine pouring it in as quickly as he can.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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speedyxjs
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| posted on 10/1/08 at 07:37 PM |
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Are there any SVA issues i should be aware of?
How long can i resist the temptation to drop a V8 in?
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speedyxjs
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| posted on 10/1/08 at 07:38 PM |
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quote:
Originally posted by iank
the recommended carburation system is a bucket brigade with the guy at the front standing astride the engine pouring it in as quickly as he can.
Not quite sure what that means but it is fuel injected.
How long can i resist the temptation to drop a V8 in?
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Simon
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| posted on 10/1/08 at 07:58 PM |
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Have a look at how close everthing is in my engine pics (fair way down):
http://deimosevolution.blogspot.com/
Then add another couple of cylinders lengthways, and a bit widthways. Will you be running the steering column though a hollow crank
BTW, I'm all for it
ATB
Simon
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iank
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| posted on 10/1/08 at 07:59 PM |
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quote:
Originally posted by speedyxjs
quote:
Originally posted by iank
the recommended carburation system is a bucket brigade with the guy at the front standing astride the engine pouring it in as quickly as he can.
Not quite sure what that means but it is fuel injected.
too much wine == humour miss 
It's supposed to imply they are about as thirsty as engines get.
To be honest you should do what makes you happiest, don't worry about us, the only thing to remember is it won't be anything like a 7
(except visually) you could even christen it the anti-bec
On SVA you will have trouble with emissions if it's one of the last ones (they made them up to 1996 according to wikipedia).
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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Fozzie
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| posted on 10/1/08 at 07:59 PM |
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quote:
Originally posted by speedyxjs
quote:
Originally posted by Fozzie
May I ask..........
by how much and how long have you lengthened and strengthened the chassis and tranny tunnel?
Ta
Fozzie
Iv lengthened and widened the bay by 6" and there will be a little more triangulation going on.
I am pretty sure that is not enough....
Have you added anything on the depth?....and what about the tranny tunnel?
We have a Jag v12 in the work shop....would you like me to take some measurements next week?
Oh..we also have some straight 6's (Jags of course) I could also measure one of those too if you want...
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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mark chandler
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| posted on 10/1/08 at 08:04 PM |
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I ran a 1987 v12 XJS for around 9 months, the engines are huge ! I also scrapped a v12 XJ6 so had one on the floor for around a year, 300kg I would
hazard they weigh a bit more when you add the ancillaries.
This car was replaced by a 4.0ltr manual XJS which was both much faster and more economical.
The EFI is pretty simple on these but its in the rear so a lot of shortening required.
To be honest I would avoid unless you know its a really good lump. If its been standing around expect the head gaskets to have gone, its a wet sleeve
engine which adds complexity so any issues they are not worth fixing.
But that said 9mpg on short runs, the best I every achieved was 17mpg with cruise control in on the motorway over a 200mile journey.
Best thing is the sound, 7000rpm exiting the dartfird tunnel, 70 - 80 mph 1st gear, 120-130 mph 2nd and 155 flat out also helps but you will need to
move axle as well, infact complete drive train.
Regards Mark
[Edited on 10/1/08 by mark chandler]
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Dingz
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| posted on 10/1/08 at 08:04 PM |
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Well Richard Stewart (Robin Hood founder)managed to fit one in an early monocoque Hood
 
Rescued attachment jv12.jpg
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