[v12-engine] V12 will it fit?

V12-Engine
1

What will I have to do to fit an 88 XJ12 V12 in my 71 E type V12?
Same mounts or not? Can the intakes from the 71 4 carb. engine be
used on the fuel injected H.E. head? What about on a pre H.E. fuel
injected head?–
Randy '87 XJ6, '71 E - Type V12
Danielsville, GA, United States
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2

At 04:07 2003-01-15 +0100, Rando wrote:

What will I have to do to fit an 88 XJ12 V12 in my 71 E type V12?
Same mounts or not?

It is supposed to be the very same block, so I don’t see why the mount
points would be different (the part for the mount themselves might be,
WRT how they bolt to the car, but I doubt that).

Can the intakes from the 71 4 carb. engine be used on the fuel injected
H.E. head? What about on a pre H.E. fuel injected head?

The injectors tap into the intakes, not the heads, so I’d have to say
yes, but then I’ve not checked out a V12 from the E-Type era. The
differences (if any) between the Pre-HE head and the heads from an E-Type
are probably nominal - if anything, the compression and valves might be
slightly different, but those don’t affect the intake.

Of course, with enough determination and ingenuity, you could manage to
mate them even if they normally wouldn’t simply bolt on.

Call up your local Jaguar dealer and inquire about the part number for the
intake manifold gaskets for the E-type application and the XJ12 (or XJ-S)
application. I suspect that they might be the same (both having been
superceeded to the same newer part). That’s only a guess on my part, but
it’s what I suspect to be the case.

I bet given some time that you could find someone on the JagXchange parting
out a V12. Heck, if you hit the archives here, I recall mention on V12 or
XJ-S inside the past three months, someone talking about a bad head they
had – pay shipping and something for the head, and you could have
something in hand to bolt your intake to and see it first hand. Last year,
two separate vendor participants on the XJ-S/V-12 lists posted up V12
engines or significant parts thereof for the taking.

— http://jaguar.professional.org/
Sean Straw '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’ 65K
Marin County, California '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’ 210K
'69 Buick GranSport 455 V8 324K

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3

The engine will bolt in.

The intakes will bolt up, too.

The HE engine is not meant for carburetors - it has very specific fueling
requirements due to the high compression and lean-burn under certain
conditions - and you are best off retrofitting the fuel injection. It CAN
be run on carbs, but for it to run well you will need to do quite a bit of
tuning.

If you do a lot of driving or racing, you’ll be happier with injection. If
you rarely use the car or otherwise can tolerate poor running and dismal
mileage, the carbs will suffice.

John

What will I have to do to fit an 88 XJ12 V12 in my 71 E type V12?
Same mounts or not? Can the intakes from the 71 4 carb. engine be
used on the fuel injected H.E. head? What about on a pre H.E. fuel
injected head?

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4

In reply to a message from Rando sent Wed 15 Jan 2003:

I’ve got what is essentially a carburetted 85 HE engine
in my 74 XJ12L and I’ll give my advice.

The blocks are identical so it will fit.(talking 5.3 here)

Any head will fit on any block.

An HE engine will run fine on carbs when the normal
jetting work is done.

The thing that MUST be brought with the HE to your E-type
is the distributor advance mechanism. I neglected to do
this when I first switched engines and noticed a very
definite difference at all RPM’s when the correct advance
curve was finally in.

I don’t know about the manual trans, but if you have a BW 12
you will have to make sure you use your old flex plate to
mate up the crank to the torque convertor.

If you do put the HE into your E-type, you will notice very
much better fuel economy, throttle response and mid-range
power. Enjoy.–
Don 74 SII XJ12L
Fort Erie, Ontario, Canada
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5

Ahh this is interesting…are you using the strombergs still ?
Thanks, Dean
73 xj12----- Original Message -----
From: don.fox@cnpower.com
To: v12-engine@jag-lovers.org
Sent: Wednesday, January 15, 2003 11:30 PM
Subject: Re: [v12-engine] V12 will it fit?

In reply to a message from Rando sent Wed 15 Jan 2003:

I’ve got what is essentially a carburetted 85 HE engine
in my 74 XJ12L and I’ll give my advice.

The blocks are identical so it will fit.(talking 5.3 here)

Any head will fit on any block.

An HE engine will run fine on carbs when the normal
jetting work is done.

The thing that MUST be brought with the HE to your E-type
is the distributor advance mechanism. I neglected to do
this when I first switched engines and noticed a very
definite difference at all RPM’s when the correct advance
curve was finally in.

I don’t know about the manual trans, but if you have a BW 12
you will have to make sure you use your old flex plate to
mate up the crank to the torque convertor.

If you do put the HE into your E-type, you will notice very
much better fuel economy, throttle response and mid-range
power. Enjoy.

–
Don 74 SII XJ12L
Fort Erie, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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6

In reply to a message from dean sent Wed 15 Jan 2003:

No, not using the ZS’s anymore. I got a deal on a set
of six dellorto’s and all manifolding, linkages, etc.
and after I managed to get it all stuffed under the
hood, and syncronized, it has run beautifully.

The timing does seem to be an important tuning item so
check Kirby’s book on this.–
Don 74 SII XJ12L
Fort Erie, Ontario, Canada
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7

aah ok, lucky you!..thanks for the info
Dean----- Original Message -----
From: don.fox@cnpower.com
To: v12-engine@jag-lovers.org
Sent: Thursday, January 16, 2003 7:42 AM
Subject: Re: [v12-engine] V12 will it fit?

In reply to a message from dean sent Wed 15 Jan 2003:

No, not using the ZS’s anymore. I got a deal on a set
of six dellorto’s and all manifolding, linkages, etc.
and after I managed to get it all stuffed under the
hood, and syncronized, it has run beautifully.

The timing does seem to be an important tuning item so
check Kirby’s book on this.

Don 74 SII XJ12L
Fort Erie, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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services and resources including Photo Albums, Event Diary / Calendar, On
Line Books and more !

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8

“I got a deal on a set of six dellorto’s and all manifolding, linkages, etc.
and after I managed to get it all stuffed under the hood, and syncronized,
it has run beautifully. - Don”

KEWL! I’d like to see a picture of that!!

rj

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9

don.fox@cnpower.com wrote:

Any head will fit on any block.

True, but because of the vastly different piston crown & combustion chamber
shapes, you can’t mix HE & Pre-HE pistons & cylinder heads.

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10

At 12:10 2003-01-16 -0600, Peter_Cohen@Dell.com wrote:

don.fox@cnpower.com wrote:

Any head will fit on any block.

True, but because of the vastly different piston crown & combustion chamber
shapes, you can’t mix HE & Pre-HE pistons & cylinder heads.

Let’s not lose sight of the fact that the original inquiry was about
intake_manifolds, not heads.

— http://jaguar.professional.org/
Sean Straw '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’ 65K
Marin County, California '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’ 210K
'69 Buick GranSport 455 V8 324K

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

11

In reply to a message from Peter_Cohen@Dell.com sent Thu 16 Jan 2003:

Hi Peter

Of course you are right about the head/pistons.
I only mentioned it as a generality because to do
the pre-HE to HE switch on the older cars with BW 12
trannys, you have to swap all the HE guts into/onto the
pre-HE block because the newer TH400 equiped engines
won’t bolt up.–
Don 74 SII XJ12L
Fort Erie, Ontario, Canada
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