Miata Mailing List: June 1996, Message #24
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   From: russotto@pond.com (Matthew T. Russotto)
Subject: Re:  160 thermostats
   Date: Sat, 1 Jun 1996 21:29:51 -0400

} No after market 160 degree thermostats I've found have a poppet bypass like
} the original 185 deg. one on my 91 BRG. Could it be that bypass valves aren't
} necessary on lo temp thermostats?

>From the information in the shop manual, it appears that the small
valve is designed to open at a lower temperature than the large one --
I'd speculate that it allows for closer regulation of engine
temperature, which probably isn't as critical if you're not
maintaining such a high temperature in the first place.