RE :

I wonder if an OBD1 ECU typically has the means to shut down an
engine if it senses coolant temps too high?

Nope.     Pretty sure.
OBD-I is not that smart really.  It's quite basic actually.
OBD-II is starting to be fairly intelligent though.    There's a great
Haynes OBD-II manual, well worth the investment.

On 9/23/2012 9:24 AM, neil n wrote:
> My approximate conversion costs (air to water cooled):
> https://sites.google.com/site/tubaneil2/15degreeengineconversion
> (heater core price is old and low. Fair warning!)
>
> For obvious reasons, I listed cooling system parts cost. But IMO, even
> if starting with a WBX, one should assess their cooling system parts
> and budget accordingly.
>
> Granted my MO usually leans too far toward "while I'm in there"
> thinking, and I tend to see through eyes of a "DIY" attitude,
> but......
>
> Unless one is certain their cooling system parts will be good for some
> time, replacing them during the engine swap process is likely a good
> investment.
>
> Neil.
>
> PS. Come to think of it, my swap could easily "run until a meltdown".
>     I wonder if an OBD1 ECU typically has the means to shut down an
> engine if it senses coolant temps too high?
>
> On Sun, Sep 23, 2012 at 8:34 AM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
>
>
>