Bypass Thermostats

[Felix Miata]

> > Mario sez:
> > >
> > >I like that design of the thermostat blocking one port (to the bypass)
> > >and opening another (to the rad) at the set temp.
> >
> > I assumed that most cars work like this. Not?
> >
> Only some of the later model engines use dual-acting or bypass
> thermostats. Toyota used them in the early Tercels, and Renault used
> them back in the little R12 - how much farther back I cannot say, but
> American engines up until very recently used standard, single acting
> stats, depending on pump pressure differences to make the water ignore
> the bypass hose when the stat opened.
>

All rotary Mazdas shipped to the US have bypass thermostats. This
started in 1970. My guess is that Mazda did this at least as far back as
1967.
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Team OS/2
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Felix Miata