Adding a chapter to this cooling thread.
For some good additional reading about thermal management see the
following from a 'nukleer' engineer.
http://yarchive.net/car/radiator_diagnosis.html
Here's my thermocouple test report (brief summary);
Cond 1: 55 mph(2500RPM), 68deg ambient, 160 T/S, #70 jets, 34deg adv by ~2600RPM
Rad inlet temp 195, outlet 187, Rally Gauge indicated ~212 (mark between 180 and 245)
Remark: R-gauge indicates false reading of ~20 degrees too hot, time to recal.
Cond 2: Idling hot for 5 min, 66deg ambient
Rad inlet 175, outlet 166, RG dropped to mid point 180/212 markings
Also had T/Cs on the rear of left head (in rear frost plug used for heater nipple
on right head) and on the temp sender boss. These locations were within 2-3
degrees of the rad inlet temps during testing Cond 1 and 2.
DECISION: Removed radiator for the removal of tanks and rodding out. The radiator
guy said it looked perfectly clean by looking in the inlets, but would take it apart
and clean. He promoted a three pass baffle system which would be accomplished by two
blocking baffles; top tank 1/3 over and bottom tank 2/3 over. He said my thin dusting
coat of laquer paint could also be the culprit so that'll be stripped off also.
We'll see tomorrow how it works. Will dilute 50/50 coolant to 30/70H2O after radiator
test for another data point if required. After that off with the pump.
aero