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Radiator get a white foam only when the engine runs on a high rpm?

Customer Question
why my radiator get...
why my radiator get a white foam only when the engine runs on a high rpm?
Submitted: 13 years ago.Category: Car
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Answered in 3 minutes by:
12/4/2009
Auto Mechanic: LowTech, Diagnostic, Electrical, Mechanical replied 13 years ago
LowTech
LowTech, Diagnostic, Electrical, Mechanical
Category: Car
Satisfied Customers: 55
Experience: I have over a decade of experience in European, Import and Exotic diagnostic and mechanical training
Verified
You have a bad head gasket, is that why you used the steal seal?
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Customer reply replied 13 years ago
That is what i think
Auto Mechanic: LowTech, Diagnostic, Electrical, Mechanical replied 13 years ago
is it over heating or has it over heated? Is the pressure causing your cooling system to boil over? Blowing smoke? Or any other signs of a bad head gasket?

Did the sealer make it any better?
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Customer reply replied 13 years ago
yes
Auto Mechanic: LowTech, Diagnostic, Electrical, Mechanical replied 13 years ago
Assuming you have a blow head gasket, which will normally cause the foam as the combustion chaimber introduces exhaust gasses into the cooling system. If you've done a compression test, you may have noticed a compression of 180psi as the engine rotates at about 300rpm. At idle your engine may be producing 200psi at 750rpm. As you rev the engine, the compression increases. If the head gasket has a light failure, it may hold the compression at idle, but as the compression increases, so does the pressure on the gasket.
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LowTech
LowTech, Diagnostic, Electrical, Mechanical
Category: Car
Satisfied Customers: 55
Experience: I have over a decade of experience in European, Import and Exotic diagnostic and mechanical training
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