Heating Spike

Hmmmmm. While we are waiting for the RTV to cure, is it possible that the water pump (aluminum and therefore has got to be aftermarket) is building enough flow to keep the thermostat closed ?

I noticed that every time I shut off the engine, the temp dropped very quickly.
 
is there any chance you have installed a REVERSE ROTATION WATER PUMP?

With this car, anything is possible. This thought had occurred to me. Is there any way, externally, to identify a reverse flow short water pump
 
Thanks Indy (love that Raiders of the Lost Ark type name) I may well take you up on that.

Sooooooo, It takes, of course, much longer to get up to temp. Driving it stays about at the first stripe; I’m guessing that is 160. Idling it goes above 210 and I shut it down before it hit the stripe above 210... I’m guessing that is 230. After a nice 20 min drive l, that happens within 10 min of idling. So, it seems without the restricton of the t-stat... at idle it gets hotter and faster hotter.

I do plan on replacing soon the radiator with a DeWitt aluminum unit. I’ve heard only good reviews about them. I am guessing, at this point, the lower hose might have been playing a role.
 
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if coolant in the engine gets hotter faster at idle than when your cruising the cause is frequently related to either a lack of air flow (not the correct fan or shroud)
or not enough functional radiator surface area,as the car speed increases it obviously has the effect of increased air flow that results in more efficient heat transfer rates
yes the idea of a larger radiator with increased surface area helps.
most of us are forced due to clearance limitations to select a radiator with specific width and height limitations you can frequently select a radiator thats a bit thicker,
or has a higher fin count per square inch of surface or more efficient inner coolant tube designs.

reading links helps

http://garage.grumpysperformance.com/index.php?threads/thoughts-on-cooling.149/

http://garage.grumpysperformance.com/index.php?threads/how-the-cooling-system-works-basics.853/

http://garage.grumpysperformance.co...ing-system-flow-rates-and-heat-transfer.9880/

http://garage.grumpysperformance.com/index.php?threads/2-row-vs-3-row.5160/

http://garage.grumpysperformance.co...roving-engine-cooling-system-capability.6888/

http://garage.grumpysperformance.com/index.php?threads/do-i-need-the-fan-shroud.13847/
 
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When I had my core replaced, the shop suggested we use this type of fin. Creates more surface
area and more turbulence.

RadiatorFinsLouvered.jpg
 
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