[Healeys] overheating

[Oudesluys]

You may have access to 197BHP but do you ever use the car in anger and 
exploit that power for prolonged periods?
Kees Oudesluijs


Joe and Lenore Armour wrote:
> Oudesluys wrote:
>
>> What is disregarded completely in this discussion that a lot of 
>> people run modified (much) more powerful than standard engines and 
>> have the standard radiator without extra cooling ca[pacity and/or a 
>> proper electric fan. Of course you would create overheating that way.
>> Kees Oudesluijs
>> NL
>>
>>  
>>
>
> FWIW,   I have a 197BHP at the back of the gearboxof my  Healey 3000 
> with a standard radiator with sealing plates across the top and bottom 
> of the core and side vertical panels with ONLY one half of the the 
> standard fan ( one blade of the two) and no electric fan. During 
> summer in Australia it has never boiled. Also has Webers and a tubular 
> exhaust manifold.  The only difference to most of the listed 
> discussion todate is I have an alloy head.
>
> Some of the experts out there will no doubt be able to explain that 
> the rate of heat transfer is most important in any heat exchange 
> system and this happens between combustion chamber : head material : 
> water  to remove the heat and then again in reverse in  the radiator 
> matrix,  water : copper : air.  All of these items/materials affect 
> the cooling system.
>
> Surface condition of cast iron has a BIG affect on the rate of 
> transfer of heat from the combustion chamber. Iron oxide ( rust,scale) 
> limits the transfer of heat into the water significantly.
>
> Also have a close look at exactly how far down the height of the block 
> the actual water jacket around the bores does go.  This area within 
> the block/bores is notorious for becoming jam packed with crud ( 
> technical term to describe all sorts of foreign matter) and this 
> decreases the surface area of the hot bits from being exposed to a 
> good water flow and therefore heat removal..  Same principal with a 
> dirty radiator.
>
> Forgot, I also have triangular vents in the guards.
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