In reply to a message from ex jag sent Wed 17 Dec 2008:
Woooo Baby! Navier-Stokes! I love it when ya’ll talk dirty! But
seriously, You have to consider the conductivity of the specific
ALLOY of the metal you are interested in, as the thermal
conductivity varies widely with composition. Also, the tubes and
fins are commonly made from different ALLOYS, for instance brass
tubes and soft copper fins are a common combination. If memory
serves (we have discussed this topic MANY times in the last ten
years) I believe that the ALUMINUM ALLOY most commonly used in
aluminum radiator tubes and fins is more conductive than the BRASS
alloy commonly used for radiator tubes. The highly conductive soft
copper tends to be used for the fins.
Regards to all,–
The original message included these comments:
In reply to a message from Robert Wilkinson sent Wed 17 Dec 2008:
The 16 to 1 ratio based on the Navier-Stokes equation would be
correct if the tubes were cylindrical, but now we are applying this
Hi Mike
Going back to the manuals again…that is getting to be a rather annoying
obstacle to all of we “who know better” :-))
Best…and have a good Christmas
Klaus-----Original Message-----
From: owner-xk@jag-lovers.org [mailto:owner-xk@jag-lovers.org] On Behalf Of
Mike Eck
Sent: Wednesday, December 17, 2008 8:24 PM
To: xk@jag-lovers.org
Subject: Re: [xk] XK120 cooling upgrade
Come again? Would you please quote your source, because all my manuals say
that Al has a thermal conductivity of 250 while the value for Cu is 401.
Copper conducts heat 1.6 times BETTER than aluminum.
Aluminium is a fantastic conductor of heat, much better than copper.
DJ
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7:21 PM
In reply to a message from Klaus Nielsen sent Thu 18 Dec 2008:
Hi,
interesting discussion about copper or aluminum, but is XK
overheating a today�s problem (heavy traffic) or was it also a
problem 60/50 years ago? Any information about this from test
driver articles of these periods?
I had the problem with my Austin Healey and E type in the summer in
rush hour traffic (could be every day here).
i replaced the Healey 3 core with a 4 core and replaced the E type
radiator (with A/C) with a ron davis Aluminum radiator.
problems exist.
problems can be cured.
ron
LA CAOn Tue, Dec 23, 2008 at 1:00 PM, Bernhard Gmeiner bernhard.gmeiner@univie.ac.at wrote:
interesting discussion about copper or aluminum, but is XK
overheating a today´s problem (heavy traffic) or was it also a
problem 60/50 years ago? Any information about this from test
driver articles of these periods?
Gruss Gott, Bernhard;
No, the early road tests do not typically mention overheating at all, in
fact The Autocar tested an alloy 120 in early 1950 and wrote it, “showed no
sign of losing tune, used very little oil and did not at any time record
above 80 deg C water temperature”. Clark Gable complained only of “the 12
volt system” and “lack of a provision for cool air in the cockpit.” meaning
every other car on the road was 6 volt and he did not have the side vents.
One thing that has not been mentioned in this discussion is to be sure the
cylinder head is clean of all crud buildup in the water passages. Remove the
hex drive plugs in the spark plug valley and the core plugs in the sides and
clean it out thoroughly. Same with the passages in the block, remove the
core plugs and clean out everything you can in there. Intake manifold too.
Rob Reilly - 679187
is XK overheating a today�s problem (heavy traffic) or was it also a
problem 60/50 years ago? Any information about this from test
driver articles of these periods?
I believe that in 1950 stop and go traffic was not an issue.
and there was not a LOT of 120’s nor a lot of traffic in arizona SoCal and Texas
ron
los angelesOn Wed, Dec 24, 2008 at 12:31 PM, R_and_J_Reilly xk120us4@sbcglobal.net wrote:
Gruss Gott, Bernhard;
No, the early road tests do not typically mention overheating at all,
Going back to this quite old thread, as I am sure overheating has been copiously addressed. Does anyone have experience in using a CAC SE466 uprated radiator fan, in a “standard” XK120 (original radiator, water pump, etc.)? Did you install one, has it made a discernable difference? This one:
