[TR] Water pumps.

[Paul Tegler]

moving water too fast through a cooling system can be just as bad as not 
moving it fast enough
(no time to xfr the heat)
always a good bet to up the cooling capacity (fans etc)

Paul Tegler ptegler at verizon.net www.teglerizer.com
On 5/9/2017 9:08 PM, Michael Porter wrote:
> On 5/9/2017 4:52 PM, TERRY SMITH wrote:
>>
>> Just curious.  Is this an engine that sits a lot, with a long time 
>> since last disassembly and boiling?  Wouldn't engines with corrosion 
>> in the water channels may need additional coaxing to cool enough?
>>
>>
> Corrosion is an interesting question.  In a cast-iron engine, it's 
> desirable.  Little-known fact:  the highest rate of heat exchange of 
> known metals is off rusty cast-iron.  That likely has something to do 
> with the large amount of surface area created by rust. Where corrosion 
> becomes a problem is when microscopic flakes break off and combine 
> with used-up anti-corrosion precipitates from the coolant. This forms 
> an insulating sludge that can cause hot spots and nucleate boiling if 
> the system pressure isn't high enough. Probably everyone tearing down 
> a Triumph engine with lots of mileage has encountered the stuff behind 
> the rearmost cylinder, where flow isn't high enough to keep the 
> particulates from settling out.
>
> In short, rust is okay.  The by-products of that corrosion are not.
>
>
> Cheers.
>