[Tigers] Overheating - May 3 test

[Joel Martin]

Still trying one thing at a time.
Parts used:
Carb is a Holly 4160C part number 0-80457S, main jet .064 with RED accelerator pump camDistributor AI65 Petronix for Ford dual point distributor with VAC advanceAI58PT Petronix coil
SS - AI51T Tiger distributor cap for correct lookMSD 6AL mounted in trunkMotorcraft spark plugs BSF42CSS - TM32 water pump - aluminum typeCustom LAT hood with large hood scope in front of radiatorOversize recored cooper/brass radiator - about 5 inches taller than stockNo expansion tank
Custom made fan shroud 
Fan 14" 6 blade 
Fan spacer places fan 1- 3/8" from radiatorFan sits 1/2" INSIDE from back of shroud
2 - 8" electric fans - not used on this test - manual off/on switch
Test:160 degree thermostat starts to open on stove at 165, fully open at 175 - 1/8" hole drilledOutside temp about 65 degreesCold car - jack up front of car to top of floor jack13 pound radiator capPull intake manfold to heater valve hose into bucket to bleed any airReattached heater valve hose - about 1 pint allowed out of hoseRemember both heater valve hoses are plugged due to 3 leaking heater valvesTop up radiator with water.Petronix distributor is pulling too much vac when attached so the vac line at distributor was removed and plugged with a golf tee
Timing with vac advance line pulled and plugged is14 degrees at idle 950 rpm's25 at 150027 at 200029 at 250030 at 3000Consensus is: this a little slow but would not cause overheating.Different opinions from the knowledge folks on when, how fast and max with vac adv on and vac adv off or not use vac adv distributors at all.

Timing with vac advance attached is:16 degrees at idle 950 rpm's27 at 1500forgot to record at 200053 at 250057 at 3000This is way too much based on discussion - so for this test and future - vac adv is removed and plugged
Closed hood and went for a drive at about 35-40 MPH - still in neighborhood - highway about 3.5 miles away - too chicken to get too far from house.  Maintained 3000 rpms in second or third.
Temperature stays at about 190 degrees while moving starting out
Stop for less than 30 seconds - temperature goes up to 200 
Drive at speed again temperature goes down about 2 degreesStop before going back into garage for less than 30 seconds - temp goes up to 210Shut off car
Some coolant out of overflow tube (after heat soak kicks at about 225), none from drive as no coolant trail down driveway and into garage and probably leaking from thermostat since I pulled and tested.
Radiator temperatures with infared gun immediately after shutting off engine.Upper radiator tank:Drivers side - 211 degreesMiddle - 213 degreesPassenger side 207 degrees
Radiator LOWER as shot from front around badge bar:Drivers side - 198 degreesMiddle - 196 degreesPassenger side 197 degrees
Radiator MIDDLE as shot from front around badge bar:Drivers side - 181 degreesMiddle - 204 degreesPassenger side 200 degrees
Header temperatures:Passenger side number 1:  359Number 2: 327Number 3: 305Number 4: 312
Drivers side number 5:  275Number 6: 297
Number 7: 266
Number 8: 281
So with tested 160 degree thermostat with 1/8" hole and air out of system, I believeand vac adj hose removed and plugged, the same result of heating up 10 degrees with each 30 second stop still in play.
So air flow or water flow or timing(not perfect, would have to change weights in distributor and determine vac adv issue) or air fuel mixture (change primary jets to .066 and move to PINK pump cam at 30CC)
Some school of thought:  fix or replace 200 mile distributor and make air flow changes changes first.Change out water pump - make and modelChange out radiator to Griffin or Fluidyne stock style with larger surface space since I have room based on custom LAT option hood.  Then go with shroud and electric fan on engine side removing existing mechanical fan or keep existing mechanical fan and not use electric fan.

What to do with custom shroud if keep the existing mechanical fan.
Either way regarding fans, I would need an original expansion tank to go with a possible new radiator.
Your ideas and thoughts are always appreciated.
My head hurts and I am going large mouth bass fishing and beers before happy hour.
Sincerely 

Joel Martin







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