Boiling at shutdown

[billswan]

Hi BIll, did you make the t-stat housing yourself or did you purchase it somewhere? Did you have to make any modifications to the grufoundos (sp?) pump to fit it to the inlet flange on the engine? 

          Thanks,      Scott R

Hello lowspeedlife

The thermostat housing is a one of a kind, built by a very talented gunsmith friend of mine. I got a slug of aluminum from another friend that runs a cnc machine shop I thought maybe he would make it for me but he said go see Dan the gun smith.  Dan would make you one if you want but he don't work for free. If I told you what that cost me you would say no thanks. But hey it is only money we can't take it with us.

The grundfos pump was a real close fit but not quite. I had to use a rotary burr in a die grinder to egg out the holes only about 1/8 inch each closer in to the center. Not enough to make the pump unusable in a normal hydronic set up though. Used a new oring in the pumps normal oring grove and it sealed up just fine. On the other end I just used 1 size smaller bolts.  5/16 inch instead of 3/8 to fasten the roid flange to the grundfos, also sealed fine with new orings.

Billswan

[NoSpark]

Jens
 Are you running an unpressurized primary loop? I know you were concerned with head gaskets and o-rings leaking but if you could keep a couple of pounds of pressure on the system that might stop the boiling. Just my two cents.

[lowspeedlife]

doesn't antifreeze's boil & freeze point start to drop after you reach about a 40/60 % water/antifreeze mixture? I have seen ice in pure antifreeze but can't remember what the temp was.




     Scott R.