[Saloon-lovers] Orphan 3.4 litre engine

I have acquired a 3.4 litre engine, KF 4868-9 from a Mark 1.
Does anyone know of a source of pistons for this higher
compression version. The engine has been rebuilt (40 yrs
ago) with all new parts, stored and never run, but the build
quality is poor, so it needs to be stripped down and gone
through…and that’s the plan.
All help gratefully accepted,
Tony–
1961 Mk 2 1968 E-Type FHC 1995 XJS Conv 1995 XJS Coupe
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In reply to a message from tbones sent Sun 17 Oct 2010:

Tony,

NOS 3.4, 9:1 pistons are NLA. Expensive repro’s can be found here:
http://www.rob-beere-racing.co.uk/engine6.html

Paul–
The original message included these comments:

I have acquired a 3.4 litre engine, KF 4868-9 from a Mark 1.
Does anyone know of a source of pistons for this higher
compression version. The engine has been rebuilt (40 yrs
ago) with all new parts, stored and never run, but the build
quality is poor, so it needs to be stripped down and gone
through…and that’s the plan.
All help gratefully accepted,
Tony


PS
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In reply to a message from tbones sent Sun 17 Oct 2010:

I assume you have already stipped the engine otherwise you may find
that just a light bore hone and a new set of rings and bearings
will do the trick.
If not, you will find that you can buy a forged set from JE or
equivalent at any compression you want for the same money or less
than those you will get from the UK. There is actually a company in
LA. CA. that does list forged piston for the Jag 6’s. Try Googling
jag forged pistons.
The alternative is to bore it out to 3.8 specs for which piston are
more readilly available. You might require to get the block sonic
tested if you go that route.–
The original message included these comments:

Does anyone know of a source of pistons for this higher
compression version. The engine has been rebuilt (40 yrs
ago) with all new parts, stored and never run, but the build


Norman LUTZ
HEIDELBERG HEIGHTS, Australia
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In reply to a message from Norman LUTZ sent Tue 19 Oct 2010:

I have a 3.4 that has been bored to 3.8 in my S Type. This
bore will result in the bore being significantly over the
recommended limit for a 3.4. However it has apparently been
done many times. My motor is bored as I said to 3.8 and is
now at the local Jag shop for a rebuild. I am having the
block sonic tested to decide if it is OK to leave it as is
or if I should sleeve it back to 3.4. Personally the later
option is my preference particularly if we find the pistons
need to be replaced.
Philip–
The original message included these comments:

The alternative is to bore it out to 3.8 specs for which piston are
more readilly available. You might require to get the block sonic
tested if you go that route.


'04 X350, '66 SType - www.myjaguarstory.com
Adelaide, Australia
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In reply to a message from Norman LUTZ sent Tue 19 Oct 2010:

Norman: thanks for your comments…the engine is now at the
machine shop for a total strip down and evaluation. I’ll let
you know what the diagnosis is…
Are you thinking of XKs Unlimited for the pistons?
Best,
Tony–
1961 Mk 2 1968 E-Type FHC 1995 XJS Conv 1995 XJS Coupe
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In reply to a message from PS sent Sun 17 Oct 2010:

Paul: thanks…Beere does great work. Also in the UK Guy
Broad has a good reputation.
Others have also suggested boring out to 3.8L, which seems
like a good idea…
I’ll let you know which way we end up going.
Tony–
1961 Mk 2 1968 E-Type FHC 1995 XJS Conv 1995 XJS Coupe
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In reply to a message from tbones sent Fri 22 Oct 2010:

Tony,

I am no expert on this idea of boring a 3.4 t0 3.8. My 3.4 S
has been bored to 3.8 and I now have in the workshop
sleeving it back to 3.4. Whatever else people advise there
are a number of facts that are clear. 1. It has been done
and can be done successfully if done properly, but there are
risks particularly if you run out of thickness. 2. Such a
bore is well in excess of manufacturers recommendation for a
3.4 block. 3. There is very little to be gained by doing it
in terms of performance.
I would make sure you got some very sound advice on this
issue, there are a lot of people who have just enough
knowledge to be dangerous, and I may be one of them. For
what its worth I would stay with 3.4.
I would be very interested to hear on this forum the advice
you get.
Philip–
The original message included these comments:

Others have also suggested boring out to 3.8L, which seems
like a good idea…


'04 X350, '66 SType, '76 XJC - www.myjaguarstory.com
Adelaide, Australia
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In reply to a message from tbones sent Fri 22 Oct 2010:

Mate, don’t do it!!!
Roger–
spitzstick
hobart, Australia
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In reply to a message from spitzstick sent Tue 26 Oct 2010:

Many thanks to everyone…we are now rebuilding the
original engine which is actually still stock after 50 years!
I’ll let you know how it goes…
Tony–
1961 Mk 2 1968 E-Type FHC 1995 XJS Conv 1995 XJS Coupe
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In reply to a message from spitzstick sent Tue 26 Oct 2010:

Many thanks to everyone…we are now rebuilding the
original engine which is actually still stock after 50 years!
I’ll let you know how it goes…
Tony–
1961 Mk 2 1968 E-Type FHC 1995 XJS Conv 1995 XJS Coupe
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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