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How these cooling systems function.

4K views 8 replies 3 participants last post by  eschaider 
#1 ·
Is there any knowledge about coolant system and flow directions. I need the understand this better, because hose routing looks so strange, thermostat has dual flaps and it's out of engine, upper coolant hose is connected to lower coolant hose etc. I have excessive pressure when engine warms up, and I want to trace out all other problems first, but I'm afraid that I have cracked head. I have iron terminator block, and all other component are from Mach1. I checked thermostat by boiling it. Ford head gasket and bolts.
 
#2 ·
The engine coolant flows:
􀁺 from the lower radiator hose to the coolant pump.
􀁺 from the coolant pump to the engine block and the cylinder heads.
NOTE: The thermostat is indexed and must be returned to the original location - which is correct direction?
 
#3 · (Edited)
very short engine run time, not very hot shen overflowing starts. Lower radiator hose is cold too. CO2 detector liquid goes from blue to green, but I can't test very long because so much bubbles and coolant comes from radiator that it will get into tester. It must be cracked head
 

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#4 ·
FinnCobra, this is an SAE paper on cooling system design published by Ford from back when they first built the then new, FGT supercar. I believe the 5.4 in the FGT and the 4.6 use the same coolant flows although the FGT flows much more volume. Hope this helps you.

Apologies for the slow response.


Ed
 

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#6 ·
I might pass on the combustion chamber pressure test FinnCobra (BTW if you give me a first name I'll use instead go your screen name). The combustion pressures after ignition are so much higher than any pressure you could simulate it doesn't make sense to even test.

If the block deck and head gasket surfaces are at or better than Ford's recommended surface finish and you use any of the commercially available MLS head gaskets you will seal up just fine.


Ed
 
#7 ·
Tomi is my name :) Block has been prepared fully in Köenigsegg factory, and heads has been resurfaced in regular machine shop. Surface finish could be little coarse than Fords recommended Ra. I used Ford Racing head swap kit which have Felpro bolts and MLS gaskets. One specialist here says that he haven't heard from cracked heads in modulars.
 
#8 ·
I would say head gasket sealing issues are far more common than a cracked head.
 
#9 ·
Jerry's (dsg2003MACH1) suggestion about the gasket leakage problem being the real bad boy and not cracks in the head casting is spot on Tomi. Save the monies you would spend on having a shop test for the cracks/leaks and repurpose them to getting the proper finish on the deck and heads that Ford calls out to seal the engine up..


Ed
 
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