[xj] Going round in circles

XJ
1

To quote Peter
‘’ we have no first or
even secondhand records anywhere on this huge database to
show that anyone else’s 4.2 engine in any Jag model ever
lunched a piston because of carbon issues alone.’’

And you clearly will never have this evidence, because to
quote Scotlander:

‘‘I suspect that in this country due to the very low price
of these series I, II and III cars, when a catastrophic
failure occurs, the car is scrapped and no further issue is
made.’’

Yes definitely circles - and I think we all have our own
views as to which is the most likely scenario. I shall keep
mine to myself.–
Rolph XJ6 C Manual/SU’s/: Alicante(Spain) Tampere(Finland)
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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2

In reply to a message from Rolph sent Mon 21 Jan 2008:

Rolph:

Going around in cirles! I call it circumlocution!

I know of at least one other XJ6 with a holed piston. it is the
recepient of an extensive lumping in NE USA.

My other obsession, now past, published a mnagazine. It had an
article with pictures of two pistons with holed tops. One was
mechanical because of a dropped valve. the other was because of
lean burn over too long a time. These were Model A Ford engines of
the thirties!

In racing my early Fords, we blew a piston from time to time.
Why, who knows, probably multiple reasons. these were no poodled
engines, but, they were made from tired parts for the most.

One of my friends went on a trip in his 49 Mercury. He blew a
piston and came home in a cloud of smoke. When we opened it up, the
top had just broken up. That was a case of a poodled car put to a
test.

These were all point and condenser ignitions and not as good as the
Jaguar OEM!

Now, I would introduce the issue of cast v. forged pistons. but, I
will not.

So, like the pulsed plug issue, I remain a skeptic on the weak
ignition as a root cause.

Enough is enough!

Carl–
The original message included these comments:

Yes definitely circles - and I think we all have our own
views as to which is the most likely scenario. I shall keep
mine to myself.

–
Carl Hutchins
Walnut Creek, California, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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3

By the way Carl, what was the cause of the holed piston you’re intimate with?
;]
The local V12 guys say the common cause in the 12 is dropped valve seats.

Hey, be sure to watch Leno’s video on the 56 Imperial.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

cadjag wrote:

In reply to a message from Rolph sent Mon 21 Jan 2008:

Rolph:

Going around in cirles! I call it circumlocution!

I know of at least one other XJ6 with a holed piston. it is the
recepient of an extensive lumping in NE USA.

My other obsession, now past, published a mnagazine. It had an
article with pictures of two pistons with holed tops. One was
mechanical because of a dropped valve. the other was because of
lean burn over too long a time. These were Model A Ford engines of
the thirties!

In racing my early Fords, we blew a piston from time to time.
Why, who knows, probably multiple reasons. these were no poodled
engines, but, they were made from tired parts for the most.

One of my friends went on a trip in his 49 Mercury. He blew a
piston and came home in a cloud of smoke. When we opened it up, the
top had just broken up. That was a case of a poodled car put to a
test.

These were all point and condenser ignitions and not as good as the
Jaguar OEM!

Now, I would introduce the issue of cast v. forged pistons. but, I
will not.

So, like the pulsed plug issue, I remain a skeptic on the weak
ignition as a root cause.

Enough is enough!

Carl

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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4

In reply to a message from cadjag sent Mon 21 Jan 2008:

Alex;

Not for sure why the Merc blew. It was a pristine car that my
friend bought and went on a trip from El Centro to San Diego.

Girls and booze added to his natuarly heavy foot were the root
cause! Actually, I think it was just a metal failure under undue
strain of hi revs over a protracted period. Something had to give.

My son busted one in a similar engine years later in a pristine 53
ford Pickup. But, that one was just old parts failing. The rod
bolts on one cylinder parted on his way from LA to WC. Some heavy
foot and girl there too, but no booze, thank God.

I guess Testosterone has to figure in to these failures some where!

Carl–
The original message included these comments:

One of my friends went on a trip in his 49 Mercury. He blew a
piston and came home in a cloud of smoke. When we opened it up, the
top had just broken up. That was a case of a poodled car put to a
test.

–
Carl Hutchins
Walnut Creek, California, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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5

:]–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

cadjag wrote:

In reply to a message from cadjag sent Mon 21 Jan 2008:

Alex;

Not for sure why the Merc blew. It was a pristine car that my
friend bought and went on a trip from El Centro to San Diego.

Girls and booze added to his natuarly heavy foot were the root
cause! Actually, I think it was just a metal failure under undue
strain of hi revs over a protracted period. Something had to give.

My son busted one in a similar engine years later in a pristine 53
ford Pickup. But, that one was just old parts failing. The rod
bolts on one cylinder parted on his way from LA to WC. Some heavy
foot and girl there too, but no booze, thank God.

I guess Testosterone has to figure in to these failures some where!

Carl

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: Jag-lovers Forums - Jag-lovers

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