[DeTomaso] Capacity of overflow tank

[michael@michaelshortt.com]

Don't forget a NASCAR Cup Car radiator costs about  $15,000 each.
It makes even our more expensive option look like sales tax.

Michael




On Thu, May 2, 2013 at 2:57 PM, <JDeRyke at aol.com> wrote:

> In a message dated 5/2/13 7:32:47 AM, demongusta at me.com writes:
>
> > You might want to pressure test the Hall cap   - the only reason I
> > mention it is because it is supposed to be 16 lbs. - mine was 9. So I
> went to the
> > old Stant standby. Been playing around with 16, 18, and 21 - 25 lb. caps.
> > What's the downside of a cap with too much pressure, other than raising
> the
> > boiling point?
> >
> Most non-custom-built radiators simply won't take pressures above 20 psi
> without ballooning or swelling the tubes, which cuts air flow   & destroys
> the
> cooling. NASCAR uses custom welded rads that can (usually) take 30 psi but
> that's not what you see for sale in the catalogues. Check to see what your
> rad was pressure-checked at by the mfgr, then subtract 10% for ageing
> unless
> it was new this year.
> And the pressure rating of a rad cap is very dependent on the height of the
> surge tank neck; original Euro- necks are taller for use with Euro caps,
> giving less compression on shorter U.S. cap springs- thus they hold lower
> pressures than rated. You can double up on the rubber gasket thickness to
> gain
> some pressure back, but usually its better to simply replace the tank neck.
> The bottoms of stock tank necks are often rough, causing pressure leaks &
> further decreasing the sealing & pressures it will hold. FWIW- J Deryke
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-- 







Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390


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