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combustion happens in the cylinder for the CHT so that is why temp peaks there first - then the hot gas is exhausted for the EGT - i would guess that a larger than normal difference between the temps would indicate a problem with gas flow, perhaps a breach or blockage in a cylinder or the exhaust system

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Q: Why does CHT cylinder head temp. peak come before EGT exhaust gas temp. peak and what is the relationship between the two that would indicate an engine problem?
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