[v12-engine] Pre HE to HE engine swap

Hi guys
Rather than rebuild my tired Pre HE, I’ve been looking at
swapping for a HE. This is in a S3 etype, don’t worry
I’ll keep the original engine.
My question is, will the Pre HE bell housing and manual
gearbox mount up to the back of the HE block?
It’s fuel injected, any problems with connecting up the
wiring to my S3 non injected etype harness.
Appreciate any comments for or against.–
Mark Brown 71 S3 Etype
Ohope beach, New Zealand
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In reply to a message from 42southern sent Sun 4 Oct 2015:

Assuming your HE has or had a GM400 trans the bolts will
be the same but the dowels different.

Clearly the carburettor pre HE harness will be missing all
HE injection circuits and components which you will need
to transfer to the E. Roger Bywater of AJ6 Engineering has
an ‘E book’ on converting E-types to EFI, unless you mean
you intend to run the HE on carbs.–
1E75339 66 D, 1R27190 70 FHC, 79 S2 XJ12L
Gaithersburg, Maryland, United States
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Rather than rebuild my tired Pre HE, I’ve been looking at
swapping for a HE. This is in a S3 etype, don’t worry
I’ll keep the original engine.
My question is, will the Pre HE bell housing and manual
gearbox mount up to the back of the HE block?

Nope! However, I think the only significant change is that the
dowel pin holes are much bigger on the H.E., so you’d have to make up
some special dowels or bushings to hold everything aligned correctly.
Alignment is essential on a M/T, it might even be worth checking it
with a dial indicator during installation.

You may also need to fiddle with the pilot bearing. Worst case, you
might have to buy an overthick bushing and have it machined down to
fit.

It’s fuel injected, any problems with connecting up the
wiring to my S3 non injected etype harness.

Non-injected? You’ll have to add quite a bit of wiring, for sure.
But it’s doable.

Appreciate any comments for or against.

In stock form, the H.E. is a better engine than your pre-H.E., and
doing away with those carbs will be wonderful. If, however, you’re
interested in performance mods, both the pre-H.E. and the carbs are
more amenable to such mods.

– Kirbert

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 !On 4 Oct 2015 at 17:54, 42southern wrote:

In reply to a message from PeterCrespin sent Sun 4 Oct 2015:

Dear Mark,

That’s pretty much what I did to mine.

You’ll need to swap over almost everthing to do with oil and water
from the old engine to the new, inside and out. Mine was a 1989 HE
block and I used an old autobox bellhousing to drill out the dowel
locations using some custom fittings made on a lathe to locate and
reinstate the old dowel locations a manual gearbox.

I did consider the AJ6 route, but decided against it on the basis
that one was buying into 30 year old life expired technology.
Instead I simply made a new harness and fitted a Megasquirt. This
gives you 10x the capability of a thirty year old injection system.

There are people who run carburettors wwith an HE, but I’d expect
you want to reprofile the needles.

kind regards
Marek–
v12 E-type running MS3/3X sequential lpg and petrol
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In reply to a message from 42southern sent Sun 4 Oct 2015:

The HE block has dowel pins to suit a T400 auto. These are
larger and in a different location but the block can be
drilled for the smaller pins using the bell housing as a
jig.
You will need to set up the housing using a dial indicator
prior to drilling the dowel holes.
You will obviously need to switch to the carbys unless you
are going to install the ECU and associated wiring–
The original message included these comments:

My question is, will the Pre HE bell housing and manual
gearbox mount up to the back of the HE block?
It’s fuel injected, any problems with connecting up the
wiring to my S3 non injected etype harness.


850225/679,1E21003,2W2001BW,JNAEY3AC100218,SAJNV4841KC156072
MELTON, Australia
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In reply to a message from MarekH sent Mon 5 Oct 2015:

Hi Marek,

I’m just wondering how difficult this was to do as whilst I
know the water pump & most of the front of the engines are
different however does the engine go in with the original
HE Sump or will I have to change it for the E-Type V12 Sump
as I would like to spin on oil filter if possible?

I am already running my Series 3 E-Type with Lucas
Injection (from an XJS) an Overdrive Manual Gearbox & a
2.88 HE Differential so have just bought a 15000 mile HE
engine to complete the transmission upgrade.

Many thanks in anticipation for any help & advice you are
able to give.–
The original message included these comments:

You’ll need to swap over almost everthing to do with oil and water


Lucky Owner of 24 Year Stored V12 Barn Find - Rot Free
Bristol, United Kingdom
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In reply to a message from Dave F sent Sun 11 Oct 2015:

Dear Dave,

If you look through the archives, you’ll see the topic has already
been covered several times over. If looking remotely, you’ll need a
parts manual for the etype and identify al of the parts which are
different - they’ll all need swapping over, e.g. engine mounts,
manifolds, timing cover, etc. The good news is that you already
have all of the parts on your car currently, so will only need
gaskets. The bad news is that your current etype engine will be
looking very bare once you are done.

The sump is part of the ‘‘oil’’, so will need swapping, as the etype
exhausts won’t fit in without it. The water pump won’t need
changing, but you’ll need the right combinataion of pulleys to work
you power steering and other ancillaries. As you are in the south
of the UK, why not pop over for a cup of tea and I can explain by
reference to my car.

I have a spare spin on oil filter adapter for a s3 etype.

kind regards
Marek–
v12 E-type running MS3/3X sequential lpg and petrol
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In reply to a message from 42southern sent Sun 4 Oct 2015:

Mark:

I guess there are two ways of going about it. The high
effort/high buck way - drilling the block, EFI conversion
using stock or Megasquirt with all attendant tuning, wiring,
fuel pump, hose and plumbing issues. Moving various mounts,
pulleys and oil system components from one block to the
other. And other work I’m sure.
Or, the medium effort/medium buck way - disassemble both
engines (I assume you were going to at least freshen the
gaskets during this swap anyway) and move the crank,
pistons, cylinders and heads to your old block and re-
install.
Some carb tuning and you are done. There are some who don’t
want carbs anywhere near their engines, but, after some
25+ trouble free years with this setup in my car, I believe
it is a good choice. Good luck to you whatever way you go.–
The original message included these comments:

Rather than rebuild my tired Pre HE, I’ve been looking at
swapping for a HE. This is in a S3 etype, don’t worry
I’ll keep the original engine.


Don 74 SII XJ12L, 66 Puch 250SGS
Port Colborne, Ontario, Canada
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