[Roadsters] Overheating question

[Matthew Cox]

Hey guys!  Quick question for you all.  My car has rapidly overheated (in 3-4 minutes) the past couple of times I have driven it. The temp gauge shoots up to about 220 and then I shut it off because, well... I don't want to ruin it. 
   
  I'm trying to track down the source. Water/Antifreeze is full and looks green and clean (no froth). Oil level is good. I pulled the top hose off of the radiator and ran the car up to 200 degrees at which point the thermostat opened and water came out. That's pretty much it. From what I've done I assume that the thermostat and water pump work (although 200 degrees is high for it to open I think). 
   
  Where should I look next? I have been planning on adding a core to the radiator, so I can do this, but I know that this isn't the source of this rapid overhating. Could the radiator be plugged somehow? Is there anything else I should look for? I know that these are pretty simple systems, so it could only be so many things...
   
  Thanks for the help!
   
  Matthew...
   
  Oh... one last thing. I think the oil circulation is fine, because the oil on the dipstick changes (level and splash) when I start it and seems to be moving around in there, but when I opened the oil filler cap and looked in there and it didn't look terribly wet. Should I see oil flying around in there or is this normal.  No, I STILL don't have an oil gauge attached...
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