[DeTomaso] Pressure cap pressure

asajay at asajay.com asajay at asajay.com
Tue Aug 18 17:18:44 EDT 2009


I'll see if I can rig up a test tonight in a similar fashion, except I  
have a real pressure system tester.  I'll record my results later.  I  
may then try to find a local shop that can change the water neck for me.

Asa Jay

Quoting Doug Braun <doug at silicondesigns.com>:

> Asa Jay,
>
> 	You're correct about the pressure bottle's water neck depth being too long.
> To test it, I used hardware store PVC fittings and hoses to plug the
> bottle's openings.  I also added a Schrader valve to one of the PVC
> fittings.  After pumping with a bicycle pump until I heard air leakage out
> the cap, I read 10 psi at the Schrader valve.  So, I decided to take my
> bottle down to the local radiator shop and have a US type neck brazed on (as
> Jack DeRyke has suggested).  Now my 16 lb cap gives me 14.5 psi.
>
> Doug
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of Asa Jay Laughton
> Sent: Tuesday, August 18, 2009 8:29 AM
> To: detomaso at realbig.com
> Subject: Re: [DeTomaso] Pressure cap pressure
>
>
> 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]
>
>
>
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