[DeTomaso] Thermostat

[Will Kooiman]

How could it be smog when the same system was around in the mid 1960's -
and probably much earlier?

My 428 FE was cast in 1966, and it has a bypass circuit.  Granted, it's
the other style that has a thermostat w/out a hat, but stillŠ

The difference with the 351C style is the bypass port is in the casting
(versus a hose on most other engines), plus the hat attempts to completely
close the bypass when the thermostat opens.

But that doesn't sound like a change for smog.  It sounds more like an
attempt to provide better cooling when the engine is hot.
--
Will





On 8/28/15 3:08 PM, "Jack DeRyke via DeTomaso" <detomaso at poca.com> wrote:

>   No; the primary reason was the then-brand-new smog requirements by the
>   U.S DOT that mandated low emissions both on initial start-up AND while
>   running. So the Cleveland (and 351-M/400 truck engines) got an
>   experimental quick warm-up cooing system plus an exhaust heated intake
>   to speed warm-up & reduce unburned fuel while running on the choke.
>   Maybe partially due to the difficulty in finding the 351-C thermostat
>   cheaply enough- most vendors have them in stock but not for chain-store
>   prices. Some 15% of the coolant flow will go around the rad if an
>   unmodified Windsor thermostat is used in a 351-C  without a 5/8" freeze
>   plug in the brass washer. . The unmodified Pantera does not have enough
>   cooling margin to absorb that 15% extra heat. The 400 block (and maybe
>   the 351-M) used a cast-in-place iron block extension with a drilling
>   that did the same function as our brass washer.
>
>   -----Original Message-----
>   From: Joseph F. Byrd, Jr. <byrdjf at embarqmail.com>
>   To: detomaso <detomaso at poca.com>
>   Sent: Thu, Aug 27, 2015 8:53 pm
>   Subject: Re: [DeTomaso] Thermostat
>I though the primary reason for the elaborate thermostat flow path for
>the Cleve
>land was due to localized "hot spots" in the block/head passages
>that will boil before the thermostat opens.  Therefore the controlled
>bypass flo
>w is to have excessive bypass during warm-up to sweep the "hot spots".
>An orifice bypass like used for other blocks would require so much bypass
>it wou
>ld rob the flow to the radiator when the thermostat opens.
>Joe/NC
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