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6 cylinder to v12 conversion

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Old 08-08-2017, 10:23 PM
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Question 6 cylinder to v12 conversion

I am a new member. I have a 94 XJS with th 4.0L 6cyl and a manual 5 speed. As many of you know, the 6 cyl XJS is a dog in the performance area. Has anyone dropped a V12 in the manual trans XJS? I understand it would Mae it a real screamer.

Thanks,

JohnV
 
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Old 08-08-2017, 10:32 PM
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Welcome.

Have a stooge around teh Series 1/2/3 tech section. Doug has made his XJ6 an XJ12.

I realise not the same, but the info would be handy.

Some here have manualised their V12's, but I dont know of any that have done your suggestion.


Yes, the V12 manual is a screamer.
 
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Old 08-08-2017, 11:17 PM
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Originally Posted by JohnV
I am a new member. I have a 94 XJS with th 4.0L 6cyl and a manual 5 speed.


Do as you like, of course. But you have a rather rare and desirable model. Personally I'd leave it alone.

It'll be much easier to buy a V12 XJS. Make it a 6.0 litre for some real ooomph.

If you go ahead with the swap you'll want a donor car on hand...or very easy and long term access to one....so you can get EVERY part you'll need, right down to the wires, bolts, brackets, cables,instruments, fuel pipes, etc. Actually installing the engine will be the easy part. Sorting the (seemingly endless number of) details is what takes the time and effort.

Cheers
DD
 
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Old 08-08-2017, 11:49 PM
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Welcome aboard John.
 
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Old 08-08-2017, 11:53 PM
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Hello, John,
It sounds like you're up for a Loooooooong project.

Welcome to the forums from ElinorB.
(';')
 
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Old 08-09-2017, 02:27 AM
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Welcome to the forum JohnV,

Good to have you with us at Jaguar forums.

Follow this link https://www.jaguarforums.com/forum/xjs-x27-32/ to the XJS forum for help, advice and information.
The 'HOW TO' thread at the top is a good place to start for information on regular issues.

Please remember to add vehicle details to your Signature to help others to give relevant advice. Go to the User CP button on the left of the top menu bar, then Settings & Options under Your Control Panel. Select Edit Signature and enter the details.

You can also visit the US Lower Atlantic Region forum by following this link https://www.jaguarforums.com/forum/usa-lower-atlantic-nc-sc-fl-ga-66/
to find other members in your region.

Enjoy the forums.

Graham
 
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Old 08-09-2017, 04:19 AM
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Welcome to Jaguar Forums John,

Good to have you with us.
Enjoy the forum.

If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help
 
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Old 08-09-2017, 05:43 AM
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Welcome to the forum.
 
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Old 08-09-2017, 06:36 AM
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welcome to the forum - enjoy!!
 
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Old 08-09-2017, 07:43 AM
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Default 6 cyl to v12 conversion

Originally Posted by Doug
Do as you like, of course. But you have a rather rare and desirable model. Personally I'd leave it alone.

It'll be much easier to buy a V12 XJS. Make it a 6.0 litre for some real ooomph.

If you go ahead with the swap you'll want a donor car on hand...or very easy and long term access to one....so you can get EVERY part you'll need, right down to the wires, bolts, brackets, cables,instruments, fuel pipes, etc. Actually installing the engine will be the easy part. Sorting the (seemingly endless number of) details is what takes the time and effort.

Cheers
DD
Thanks. Will take your advice, but will miss the performance of my 'Vette.
 

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