[DeTomaso] Pressure cap pressure

[Asa Jay Laughton]

But what about the depth of the water neck the cap goes on?  I can 
measure the depth of the stock swirl tank as between 1/8 "and 1/4" 
deeper than other water necks.  This concerns me as a 16 lb cap may not 
give me 16 lb if the water neck does not have the correct depth.

Asa Jay

Asa Jay Laughton, MSgt, USAFR, Retired

& Shelley Marie
Spokane, WA

1971 Mach I Mustang  [ASA JAY]
1973 Pantera L 5533  [ASASCAT]
    
******************************     
http://www.asajay.com
http://www.teampanteraracing.com
  



JDeRyke at aol.com wrote:
> In a message dated 8/17/09 3:39:33 PM, asajay at asajay.com writes:
>
>
>   
>> What is the proper pressure rating for the cap we should use on the swirl 
>> tank?
>> 16 lb?
>> 18 lb?
>> 120 lb?
>>
>>     
> I have an article on this very subject in the Sept POCA News (now in 
> print). Stock was 0.9-bar (equiv. to a 13 lb cap). I've successfully run up to a 
> 16-lb cap on a non-stock copper radiator but I would not go higher on copper, 
> give the thin-ness and general fragility of the tubes. With stronger 
> aluminum radiators, you can go as high as 20 lb cap (stock early '90s Mercedes 
> w/aluminum rad), giving you a little more margin before boiling. But to run 
> that high a system pressure, you better have good clamps everywhere and high 
> quality hoses -including the heater hoses AND the two short ones under the 
> dash.... or you'll soon find out where your weak spot is! Good luck- J Deryke
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