It is difficult to compare the heat transfer of aluminium and
copper/brass radiators. In theory copper conducts the heat better than
aluminium. However it may well be that because of the construction an
aftermarket aluminium radiator dissipates more heat than a standard
brass/copper one. A brass/copper radiator with an improved/enlarged core
would as well.
Anyone got any numbers for heat transfer per square meter or foot for
the various options?
Kees Oudesluijs
NL
Larry Varley schreef op 14-7-2014 22:14:
> Hi Gary, copper is a better conductor than aluminium, but solder
> isn't, and there is a lot of soldered surfaces in a copper / brass
> radiator. I agree it's hard to compare an old radiator to a new one.
> Regards
> Larry Varley
>
> On 15/07/2014 4:13 AM, editorgary@aol.com wrote:
>> A number of years have passed since I swapped an aluminum radiator
>> for the
>> original black brass/copper radiator on my MGA race car, but I
>> vaguely recall
>> from the discussions at that time that aluminum actually is a worse
>> metal for
>> heat transfer than copper/brass. Can one of you metallurgists comment?
>>
>> My understanding at the time had nothing to do with inherent heat
>> transfer,
>> but rather that I needed a new radiator since mine was very clogged
>> up, and to
>> buy a replacement original, or recore my original was more expensive
>> than the
>> cool-looking aluminum replacement I could buy from the standard
>> source in
>> Phoenix. As an additioanal incentive, the aluminum radiator -- which
>> was a
>> bolt-in substitute -- was lighter than the copper/brass original. Of
>> course it
>> worked better, simply because it was brand new and totally
>> uncorroded, in
>> contrast to the 40 years of corrosion in my old radiator.
>>
>> Any other thoughts?
>>
>> Gary Anderson
>> Editor at large, Austin-Healey Magazine.
>>
>>
>>
>> David Nock wrote:
>> Cleaning the original style radiator I would not recommend. The
>> original style
>> is a very inefficient style of radiator core.The new style cores
>> with the
>> fins that go vertically between the tube are far more efficient at
>> cooling.
>> They can have more tubes and fins per inch.
>> The next best is an aluminum radiator, they will transfer heat much
>> better
>> than a copper brass radiator and will recover much faster.I have
>> recently
>> installed an aluminum radiator in my BN4. This last weekend we had
>> temps at
>> 100 degrees. I was out all day. Engine temp stayed steady at 170
>> degrees at
>> driving speedsSlowed thru town and thru the local shopping center the
>> temp
>> creped up to about 200 degrees then as soon as I picked a little
>> speed the
>> temp came right back down to 170 . Prior to the alloy radiatorI would
>> run
>> constantly down the freeway at 190 degrees and closer to 200 on a hot
>> day,
>> then in traffic it would quickly climb to 215 plus and was slow to
>> recover.
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