1975 Jaguar XJ Coupe 6.0 V12

1975 Jaguar XJ Coupe 6.0 V12

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Discussion

craigjm

Original Poster:

17,961 posts

201 months

Monday 21st November 2016
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Will have a look tomorrow and see if they have them spare and retrieve them for you

craigjm

Original Poster:

17,961 posts

201 months

Monday 21st November 2016
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My new grille offered up to the retropower car



They didn't have the bits you want on their donor car Rob

RobXjcoupe

3,175 posts

92 months

Monday 21st November 2016
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Thank you for asking smile
The grill looks fab by the way!

RobXjcoupe

3,175 posts

92 months

Monday 21st November 2016
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Are retropower expensive?

craigjm

Original Poster:

17,961 posts

201 months

Monday 21st November 2016
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RobXjcoupe said:
Are retropower expensive?
I don't know to be honest I've never spent a penny with them we are just helping each other out with ideas and parts etc.

RobXjcoupe

3,175 posts

92 months

Monday 21st November 2016
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I wouldn't mind retropower sorting out my coupe, I was looking at there projects which are varied. The welder and fabricator they have is in my eyes very good. My background is automotive press tooling and he seems spot on.
I've got a couple of ideas for my own car which haven't been used on yours or the project at retropower, nothing too custom but do keep with period jaguar smile

richw_82

992 posts

187 months

Tuesday 22nd November 2016
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craigjm said:
The problem with a modern Jag engine of v8 flavour is that they are too tall to sit within the engine bay so if you ever wanted to do it you would have to dry sump etc.
Beacham managed to put a modern Jag V8 in an XJ6 S2, and I've seen one in an XJS - I think one chap on here had done it? Having had a look at one in my Dad's XK, I reckon it would go in without too much messing about.

I have to re-engine my S3 XJ6 next year, it might be worth a go for fun!

craigjm

Original Poster:

17,961 posts

201 months

Tuesday 22nd November 2016
quotequote all
richw_82 said:
craigjm said:
The problem with a modern Jag engine of v8 flavour is that they are too tall to sit within the engine bay so if you ever wanted to do it you would have to dry sump etc.
Beacham managed to put a modern Jag V8 in an XJ6 S2, and I've seen one in an XJS - I think one chap on here had done it? Having had a look at one in my Dad's XK, I reckon it would go in without too much messing about.

I have to re-engine my S3 XJ6 next year, it might be worth a go for fun!
Didn't say it couldn't be done just that as standard it's too tall and the supercharged version is even taller. Anything can be fitted if your willing to modify the engine and the body. Any gearbox bigger than the ZF four speed requires serious modification of the transmission tunnel too.

Anything can be done if you can do it yourself or have enough ££££ which is why cars like the Beachams and Eagles etc are north of £200k

RobXjcoupe

3,175 posts

92 months

Wednesday 23rd November 2016
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craigjm said:
richw_82 said:
craigjm said:
The problem with a modern Jag engine of v8 flavour is that they are too tall to sit within the engine bay so if you ever wanted to do it you would have to dry sump etc.
Beacham managed to put a modern Jag V8 in an XJ6 S2, and I've seen one in an XJS - I think one chap on here had done it? Having had a look at one in my Dad's XK, I reckon it would go in without too much messing about.

I have to re-engine my S3 XJ6 next year, it might be worth a go for fun!
Didn't say it couldn't be done just that as standard it's too tall and the supercharged version is even taller. Anything can be fitted if your willing to modify the engine and the body. Any gearbox bigger than the ZF four speed requires serious modification of the transmission tunnel too.

Anything can be done if you can do it yourself or have enough ££££ which is why cars like the Beachams and Eagles etc are north of £200k
The jag v12 can achieve just as much power output if you increase its displacement. 10 litres can be done but at obvious cost. The 6.0 v12 is a 400bhp engine in tweaked form. Also the 4.2 straight six is restricted by its relative low redline max rpm. A steel crank and rods will allow modern max rpm and again that's gives more max bhp. A standard crank 4.2 will give 260-280bhp depending on the triple carbs used with tweaked cams with good torque due to its long stroke. You shouldn't dismiss these original engines so quickly. My opinion anyway wink

vpr

3,711 posts

239 months

Wednesday 23rd November 2016
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/\ Agreed.

A sorted V12 means the Jag keeps it's soul. A manual conversion and it's job done

I had a 7.0 V12 in my Lister and it sounded awesome

craigjm

Original Poster:

17,961 posts

201 months

Wednesday 23rd November 2016
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What kind of mpg did you get out of a 7.0 manual? hehe

Mezzanine

9,224 posts

220 months

Wednesday 23rd November 2016
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Thanks for enlighten me to RetroPower, their work looks fantastic.

Will bookmark that for future use smile

vpr

3,711 posts

239 months

Wednesday 23rd November 2016
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craigjm said:
What kind of mpg did you get out of a 7.0 manual? hehe
I've no idea but not good

Listers weren't fueled properly, their answer to it was just flood the engine with it

anonymous-user

55 months

Wednesday 23rd November 2016
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vpr said:
I've no idea but not good

Listers weren't fueled properly, their answer to it was just flood the engine with it
My XJR-S seems to follow a similar philosophy. I wondered if the racing origins of the Zytek system and the small production run of cars using it means that the calibration work was not brilliant for road use. I also thought there was something wrong with mine because the idle quality isn't brilliant, but several of the the contemporary reviews mention it.

craigjm

Original Poster:

17,961 posts

201 months

Wednesday 23rd November 2016
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Mine doesn't idle very well either which is why I'm considering if I keep the 6.0 fitting an emerald switchable ECU and starting from scratch with the programming on a rolling road

anonymous-user

55 months

Wednesday 23rd November 2016
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It seems to depend on it's mood. Usually it's silent and smooth with the odd stumble that you can feel in the car but sometimes it stumbles a bit more and sometimes a bit less. Putting it into D helps, and I believe the car has a solenoid valve to let some extra air into the intake when in D with the Air Con running to keep idle speed up.


LanceRS

2,173 posts

138 months

Wednesday 23rd November 2016
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You would be amazed at what can be achieved with a some more modern technology. A few years ago a friend of mine converted a group 1 RS2000 from 44IDF Weber carbs, to Jenvey throttle bodies and an Emerald ecu. It totally transformed the car from lumpy and peaky to remarkably smooth and linear. So much so that in something else you would never have guessed that it was a Pinto.

craigjm

Original Poster:

17,961 posts

201 months

Wednesday 23rd November 2016
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DME you might want to check your vacuum hose attachment to the ECU

vpr

3,711 posts

239 months

Wednesday 23rd November 2016
quotequote all
LanceRS said:
You would be amazed at what can be achieved with a some more modern technology. A few years ago a friend of mine converted a group 1 RS2000 from 44IDF Weber carbs, to Jenvey throttle bodies and an Emerald ecu. It totally transformed the car from lumpy and peaky to remarkably smooth and linear. So much so that in something else you would never have guessed that it was a Pinto.
Jenvey and emerald was my solution to my S1 Etype (apologies if I've already posted up)and also on my 280Z

So smooth, so efficient, so clean and starts on the button





bob-lad

2,212 posts

106 months

Wednesday 23rd November 2016
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vpr said:
LanceRS said:
You would be amazed at what can be achieved with a some more modern technology. A few years ago a friend of mine converted a group 1 RS2000 from 44IDF Weber carbs, to Jenvey throttle bodies and an Emerald ecu. It totally transformed the car from lumpy and peaky to remarkably smooth and linear. So much so that in something else you would never have guessed that it was a Pinto.
Jenvey and emerald was my solution to my S1 Etype (apologies if I've already posted up)and also on my 280Z

So smooth, so efficient, so clean and starts on the button



That looks gorgeous.