[xj] Leaking water-pump advice from a hoon

XJ
1

“Wasson, Tim” <@Wasson_Tim>

Don’t even think about replacing the bearing. Rebuilt units are available
quite reasonably, at least here in the US. About $80 USD or so, more or
less. I’ve changed mine, it’s a pain w/ the stock fan and shroud in place,
now it would be a piece of cake since I’ve gone electric. I figure not
having a fan spinning on that bearing can only be good for waterpump life
expectancy.

Obligatory hoon type content: Removing the front cover from the air filter
assy produces a nice snarl at about 4000 rpm!

Tim Wasson
Hoon-in-training (first, it was the fan, then the non-stock alternator
location and removal of air pump, now it’s the intake noise increase, and
just wait until I finally install my series 2 exhaust and cut down to 2
mufflers! Didn’t I see an article about putting an MR2 supercharger on an
XK motor?)> Opening the bonnet, I saw that the water-pump is slightly leaking out of

the shaft-area.

My question now: Is this seal replaceable, does it have a spares-number,
or does it make more sense to buy a new water-pump?
According to the service-history, the old one has been in since new and
the car has meanwhile done 208.000km (130k miles).
What is a waterpump’s MTBF anyway?
And how much does a new one cost?

Lots of questions from somebody who carries 30 litres of water in the
back of his car, just to make sure…

See ya all,

Markus

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2

MillTech MillTech@Pacbell.net

“Wasson, Tim” wrote:
SNIP

Removing the front cover from the air filter

assy produces a nice snarl at about 4000 rpm!

SNIP

Tim,
Was there a noticable improvement in performance??

Jim===================================================
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3

“Wasson, Tim” <@Wasson_Tim>

There’s been a noticable increase in how often I put my right foot to the
floor, with a corrosponding increase in what the car actually does. Did it
improve performance? Without any test runs or dyno runs, it’s rather
subjective. But the engine does seem to spool up a little faster, just
revving in park. Not quite as much of a change as when I pulled the fan and
clutch, but still noticable. Seems to be a little snappier driving.
Haven’t had it removed long enough to tell what it does to mileage, but
another fellow hoon reported a 1-1.5 mpg increase.

I figure it this way: The rest of the intake system is about 3 inches in
diameter. Each intake runner to the head is about an inch in diameter. The
little trumpet is about 1.25 inches in diameter. It is definitely a choke
point. Motors are air pumps. Choke points restrict air flow. More air
flow means more power, so it can’t hurt. If it was sufficiently sized,
then the rest of the intake system would be that size. It looks like a
sacrifice of performance in the name of silence. I wish to accentuate the
sport aspects of my XJ instead of the luxury aspects. I’d guess that cat
and muffler removal would produce a larger gain, but man, that growling
sound is addictive, and people notice it when you get on it!

I’d still like to form a nice tube to suck cool air from beside the radiator
(the coffee can mod?) instead of warm engine compartment air.

Of course, if I was really serious about performance, I’d pull a headlight
and run an intake tube from the headlight bucket to the intake, and get some
ram-air effect!

Tim Wasson, hoon-in-training
84 VDP> -----Original Message-----

From: MillTech [SMTP:MillTech@pacbell.net]
Sent: Monday,June 19,2000 8:49 AM
To: xj@jag-lovers.org
Subject: Re: [xj] Leaking water-pump advice from a hoon…

MillTech MillTech@Pacbell.net

“Wasson, Tim” wrote:
SNIP

Removing the front cover from the air filter

assy produces a nice snarl at about 4000 rpm!

SNIP

Tim,
Was there a noticable improvement in performance??

Jim

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4

MillTech MillTech@Pacbell.net

“Wasson, Tim” wrote:

I’d still like to form a nice tube to suck cool air from beside the radiator
(the coffee can mod?) instead of warm engine compartment air.

Of course, if I was really serious about performance, I’d pull a headlight
and run an intake tube from the headlight bucket to the intake, and get some
ram-air effect!

Tim Wasson, hoon-in-training
84 VDP

Tim,

I am evaluating the benefits of making a tube out of 3 inch aircraft
‘scat’ tubing. This will be able to withstand the temperature under the
hood. If it works, the tube will be connected to the front of the air
filter lid and will become rectangular at the radiator end. Could you
estimate, please, the length you would require and what dimensions you
would want at the radiator opening? My car was built for distribution
in Europe and so may not be the same as yours. Also for what it’s
worth, hot/warm air will seriously decrease your performance, so you
will see further benefit when you duct unheated air to the engine. Have
you ever noticed how the car feels stronger on a cold evening? Thats
the benefit of cool air. It’s much more dense tahn hot air and so
there’s more Oxygen available to the engine.

Regards,

Jim===================================================
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